{"id":39280,"date":"2026-02-18T03:30:42","date_gmt":"2026-02-18T00:30:42","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/leetcode-3304-dize-oyununda-kinci-karakteri-anlamak-adim-adim-kilavuz\/"},"modified":"2026-02-18T03:30:42","modified_gmt":"2026-02-18T00:30:42","slug":"leetcode-3304-dize-oyununda-kinci-karakteri-anlamak-adim-adim-kilavuz","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/leetcode-3304-dize-oyununda-kinci-karakteri-anlamak-adim-adim-kilavuz\/","title":{"rendered":"LeetCode 3304: Dize Oyununda K&#8217;\u0131nc\u0131 Karakteri Anlamak (Ad\u0131m Ad\u0131m K\u0131lavuz)"},"content":{"rendered":"<h2>LeetCode 3304: Dize Oyununda K&#8217;\u0131nc\u0131 Karakteri Anlamak (Ad\u0131m Ad\u0131m K\u0131lavuz)<\/h2>\n<p>Dize manip\u00fclasyonu ve rek\u00fcrsif desenler, algoritmik problem \u00e7\u00f6zmenin temel ta\u015flar\u0131ndan biridir. LeetCode 3304 problemi, bu iki kavram\u0131 zarif bir \u015fekilde bir araya getirerek, belirli bir kurala g\u00f6re olu\u015fturulan devasa bir dizedeki K&#8217;\u0131nc\u0131 karakteri bulmam\u0131z\u0131 istiyor. Bu makalede, problemi derinlemesine inceleyecek, basit yakla\u015f\u0131mlardan ba\u015flayarak optimal ve verimli bir \u00e7\u00f6z\u00fcme nas\u0131l ula\u015faca\u011f\u0131m\u0131z\u0131 ad\u0131m ad\u0131m ke\u015ffedece\u011fiz.<\/p>\n<h3>1. Problemi Anlamak: LeetCode 3304 Nedir?<\/h3>\n<p>LeetCode 3304, &#8220;Understanding the K-th Character in the String Game&#8221; ba\u015fl\u0131\u011f\u0131 alt\u0131nda sunulan bir problem olup, rek\u00fcrsif olarak tan\u0131mlanan bir dize serisinden belirli bir karakteri bulmay\u0131 hedefler. Bu t\u00fcr problemler, genellikle do\u011frudan dizeyi olu\u015fturman\u0131n zaman veya bellek k\u0131s\u0131tlamalar\u0131 nedeniyle imkans\u0131z oldu\u011fu durumlarda, dize i\u00e7indeki desenleri ve simetriyi anlamay\u0131 gerektirir.<\/p>\n<h4>1.1. Problem Tan\u0131m\u0131<\/h4>\n<p>Problem, $S_0 = &#8220;0&#8221;$ ile ba\u015flayan bir dize serisi tan\u0131mlar. Her bir sonraki dize $S_i$, $S_{i-1}$ dizisinden t\u00fcretilir. Kural \u015fu \u015fekildedir:<\/p>\n<p>$S_i = S_{i-1} + &#8216;1&#8217; + \\text{reverse}(\\text{invert}(S_{i-1}))$<\/p>\n<p>Burada:<\/p>\n<ul>\n<li>$\\text{reverse}(X)$: $X$ dizisinin tersini d\u00f6nd\u00fcr\u00fcr. \u00d6rne\u011fin, $\\text{reverse}(&#8220;010&#8221;) = &#8220;010&#8221;$.<\/li>\n<li>$\\text{invert}(X)$: $X$ dizisindeki t\u00fcm &#8216;0&#8217;lar\u0131 &#8216;1&#8217;e, &#8216;1&#8217;leri &#8216;0&#8217;a \u00e7evirir. \u00d6rne\u011fin, $\\text{invert}(&#8220;010&#8221;) = &#8220;101&#8221;$.<\/li>\n<\/ul>\n<p>Bize verilen bir $n$ ve $k$ de\u011feri i\u00e7in, $S_n$ dizisindeki $k$-\u0131nc\u0131 karakteri (1-indeksli) bulmam\u0131z istenir.<\/p>\n<h4>1.2. Neden \u00d6nemli?<\/h4>\n<p>Bu problem, rek\u00fcrsif yap\u0131lar\u0131, desen tan\u0131may\u0131 ve b\u00fcy\u00fck veri setleriyle ba\u015fa \u00e7\u0131kmak i\u00e7in verimli algoritmalar geli\u015ftirmeyi \u00f6\u011fretir. Do\u011frudan dizeyi olu\u015fturmaya \u00e7al\u0131\u015fmak, $n$ de\u011feri b\u00fcy\u00fcd\u00fck\u00e7e imkans\u0131z hale gelir, bu da bizi matematiksel \u00f6zelliklere ve optimize edilmi\u015f \u00e7\u00f6z\u00fcmlere y\u00f6nlendirir.<\/p>\n<h4>1.3. Temel Ama\u00e7<\/h4>\n<p>Amac\u0131m\u0131z, $S_n$ dizisini fiziksel olarak olu\u015fturmadan, sadece $n$ ve $k$ de\u011ferlerini kullanarak $k$-\u0131nc\u0131 karakteri h\u0131zl\u0131 ve verimli bir \u015fekilde belirlemektir.<\/p>\n<h3>2. Oyunun Kurallar\u0131 ve Dize Olu\u015fumu<\/h3>\n<p>Dize serisinin nas\u0131l b\u00fcy\u00fcd\u00fc\u011f\u00fcn\u00fc ve karakterlerin nas\u0131l de\u011fi\u015fti\u011fini anlamak, \u00e7\u00f6z\u00fcm\u00fcn temelini olu\u015fturur. Bu b\u00f6l\u00fcm, dize olu\u015fum mekanizmas\u0131n\u0131 ve ilk birka\u00e7 dizeyi inceleyecektir.<\/p>\n<h4>2.1. Dize \u00dcretim Mekanizmas\u0131<\/h4>\n<p>Dize \u00fcretim kural\u0131n\u0131 tekrar hat\u0131rlayal\u0131m: $S_i = S_{i-1} + &#8216;1&#8217; + \\text{reverse}(\\text{invert}(S_{i-1}))$. Bu kural, her ad\u0131mda dizenin uzunlu\u011funu yakla\u015f\u0131k olarak iki kat\u0131na \u00e7\u0131kar\u0131r ve ortas\u0131na sabit bir &#8216;1&#8217; karakteri ekler.<\/p>\n<h4>2.2. \u00d6rnek Dize Geli\u015fimi<\/h4>\n<p>\u0130lk birka\u00e7 dizeyi manuel olarak olu\u015ftural\u0131m:<\/p>\n<ul>\n<li>$S_0 = &#8220;0&#8221;$<\/li>\n<li>$S_1 = S_0 + &#8216;1&#8217; + \\text{reverse}(\\text{invert}(S_0))$\n<ul>\n<li>$\\text{invert}(S_0) = \\text{invert}(&#8220;0&#8221;) = &#8220;1&#8221;$<\/li>\n<li>$\\text{reverse}(&#8220;1&#8221;) = &#8220;1&#8221;$<\/li>\n<li>$S_1 = &#8220;0&#8221; + &#8216;1&#8217; + &#8220;1&#8221; = &#8220;011&#8221;$<\/li>\n<\/ul>\n<\/li>\n<li>$S_2 = S_1 + &#8216;1&#8217; + \\text{reverse}(\\text{invert}(S_1))$\n<ul>\n<li>$\\text{invert}(S_1) = \\text{invert}(&#8220;011&#8221;) = &#8220;100&#8221;$<\/li>\n<li>$\\text{reverse}(&#8220;100&#8221;) = &#8220;001&#8221;$<\/li>\n<li>$S_2 = &#8220;011&#8221; + &#8216;1&#8217; + &#8220;001&#8221; = &#8220;0111001&#8221;$<\/li>\n<\/ul>\n<\/li>\n<li>$S_3 = S_2 + &#8216;1&#8217; + \\text{reverse}(\\text{invert}(S_2))$\n<ul>\n<li>$\\text{invert}(S_2) = \\text{invert}(&#8220;0111001&#8221;) = &#8220;1000110&#8221;$<\/li>\n<li>$\\text{reverse}(&#8220;1000110&#8221;) = &#8220;0110001&#8221;$<\/li>\n<li>$S_3 = &#8220;0111001&#8221; + &#8216;1&#8217; + &#8220;0110001&#8221; = &#8220;011100110110001&#8221;$<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Bu dizelerin uzunluklar\u0131n\u0131 bir tabloda g\u00f6relim:<\/p>\n<table>\n<thead>\n<tr>\n<th>Dize ($S_i$)<\/th>\n<th>Uzunluk ($\\text{len}(S_i)$)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>$S_0$<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>$S_1$<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>$S_2$<\/td>\n<td>7<\/td>\n<\/tr>\n<tr>\n<td>$S_3$<\/td>\n<td>15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>G\u00f6r\u00fcld\u00fc\u011f\u00fc gibi, $S_i$ dizisinin uzunlu\u011fu $2^{i+1} &#8211; 1$ form\u00fcl\u00fc ile ifade edilebilir. Bu, her ad\u0131mda uzunlu\u011fun yakla\u015f\u0131k olarak iki kat\u0131na \u00e7\u0131kt\u0131\u011f\u0131n\u0131 do\u011frular.<\/p>\n<h4>2.3. Karakterlerin \u00d6zellikleri<\/h4>\n<p>Dizeleri dikkatle inceledi\u011fimizde baz\u0131 \u00f6nemli \u00f6zellikler fark ederiz:<\/p>\n<ul>\n<li>Her $S_i$ dizisinin tam ortas\u0131nda her zaman &#8216;1&#8217; karakteri bulunur. (\u00d6rn: $S_1 = &#8220;0\\underline{1}1&#8243;$, $S_2 = &#8220;011\\underline{1}001&#8243;$)<\/li>\n<li>$S_i$ dizisinin ilk yar\u0131s\u0131, do\u011frudan $S_{i-1}$ dizisidir.<\/li>\n<li>$S_i$ dizisinin ikinci yar\u0131s\u0131 (orta &#8216;1&#8217;den sonraki k\u0131s\u0131m), $S_{i-1}$&#8217;in ters \u00e7evrilmi\u015f ve tersine \u00e7evrilmi\u015f halidir.<\/li>\n<\/ul>\n<h3>3. \u0130lk Yakla\u015f\u0131m: Brute Force ve Neden Yetersiz?<\/h3>\n<p>Do\u011frudan dizeyi olu\u015fturma fikri, akla gelen ilk yakla\u015f\u0131md\u0131r. Ancak bu, b\u00fcy\u00fck $n$ de\u011ferleri i\u00e7in h\u0131zla kullan\u0131lamaz hale gelir.<\/p>\n<h4>3.1. Basit Bir Sim\u00fclasyon<\/h4>\n<p>E\u011fer $n$ k\u00fc\u00e7\u00fckse (\u00f6rne\u011fin $n < 10$), $S_n$ dizisini yukar\u0131daki kurallara g\u00f6re bir d\u00f6ng\u00fc i\u00e7inde olu\u015fturabilir ve sonra $k$-\u0131nc\u0131 karakteri do\u011frudan alabiliriz. Python'da basit bir implementasyon \u015f\u00f6yle g\u00f6r\u00fcnebilir:<\/p>\n<pre><code>\ndef invert_string(s):\n    return \"\".join(['1' if c == '0' else '0' for c in s])\n\ndef find_kth_character_brute_force(n, k):\n    s = \"0\"\n    for _ in range(n):\n        inverted_s = invert_string(s)\n        reversed_inverted_s = inverted_s[::-1]\n        s = s + '1' + reversed_inverted_s\n    return s[k-1] # k 1-indeksli oldu\u011fu i\u00e7in k-1\n\n# \u00d6rnek kullan\u0131m:\n# print(find_kth_character_brute_force(2, 5)) # \u00c7\u0131kt\u0131: 0 (S2 = \"0111001\", 5. karakter '0')\n<\/pre>\n<p><\/code><\/p>\n<h4>3.2. Zaman ve Bellek S\u0131n\u0131rlamalar\u0131<\/h4>\n<p>Bu yakla\u015f\u0131m\u0131n temel sorunu, dizenin uzunlu\u011funun $n$ ile birlikte \u00fcstel olarak b\u00fcy\u00fcmesidir. $S_n$ dizisinin uzunlu\u011fu $2^{n+1} - 1$ oldu\u011fundan, $n=20$ i\u00e7in bile dize uzunlu\u011fu $2^{21}-1 \\approx 2$ milyon karakteri a\u015far. $n=60$ gibi de\u011ferler i\u00e7in dize uzunlu\u011fu $2^{61}-1$ olur ki bu, mevcut bellekte saklanamayacak kadar b\u00fcy\u00fckt\u00fcr. Ayr\u0131ca, her ad\u0131mda dize birle\u015ftirme ve ters \u00e7evirme i\u015flemleri de uzunlukla orant\u0131l\u0131 olarak zaman al\u0131r, bu da zaman karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 $O(2^n)$ yapar.<\/p>\n<h4>3.3. Daha Verimli Bir Yola \u0130htiya\u00e7<\/h4>\n<p>Brute force yakla\u015f\u0131m\u0131n\u0131n yetersizli\u011fi, bizi dizeyi fiziksel olarak olu\u015fturmadan $k$-\u0131nc\u0131 karakteri bulman\u0131n yollar\u0131n\u0131 aramaya iter. Bu, genellikle problemin rek\u00fcrsif do\u011fas\u0131n\u0131 ve i\u00e7indeki desenleri kullanmay\u0131 gerektirir.<\/p>\n<h3>4. Desenleri Ke\u015ffetmek: \u00d6zyinelemeli Yap\u0131<\/h3>\n<p>Problemin rek\u00fcrsif tan\u0131m\u0131, \u00e7\u00f6z\u00fcm\u00fc de rek\u00fcrsif bir \u015fekilde d\u00fc\u015f\u00fcnmemiz gerekti\u011fini i\u015faret eder. $S_n$ i\u00e7indeki $k$-\u0131nc\u0131 karakteri bulmak i\u00e7in $S_{n-1}$'e nas\u0131l ba\u015fvurabilece\u011fimizi inceleyelim.<\/p>\n<h4>4.1. Dize Uzunluklar\u0131n\u0131n \u0130li\u015fkisi<\/h4>\n<p>$S_n$ dizisinin uzunlu\u011fu $\\text{len}(S_n) = 2^{n+1} - 1$'dir. Bu, $S_n$ dizisinin orta noktas\u0131n\u0131n indeksinin (1-indeksli) $2^n$'e denk geldi\u011fi anlam\u0131na gelir. (\u00d6rn: $S_2$ uzunlu\u011fu 7, orta nokta $2^2=4$. $S_2 = \"011\\underline{1}001\"$, 4. karakter '1').<\/p>\n<h4>4.2. Simetri ve Ters \u00c7evirme<\/h4>\n<p>Dize olu\u015fum kural\u0131 $S_i = S_{i-1} + '1' + \\text{reverse}(\\text{invert}(S_{i-1}))$ bize \u00fc\u00e7 ana b\u00f6l\u00fcm oldu\u011funu g\u00f6sterir:<\/p>\n<ol>\n<li>$S_{i-1}$ (ilk k\u0131s\u0131m)<\/li>\n<li>'1' (orta karakter)<\/li>\n<li>$\\text{reverse}(\\text{invert}(S_{i-1}))$ (son k\u0131s\u0131m)<\/li>\n<\/ol>\n<p>Bu yap\u0131, karakterin $S_n$ i\u00e7inde hangi b\u00f6l\u00fcme d\u00fc\u015ft\u00fc\u011f\u00fcne ba\u011fl\u0131 olarak problemin boyutunu k\u00fc\u00e7\u00fcltmemize olanak tan\u0131r.<\/p>\n<h4>4.3. \u00d6zyinelemeli \u0130li\u015fki Kurma<\/h4>\n<p>Bir karakterin $S_n$ i\u00e7indeki konumunu $k$ olarak alal\u0131m. \u00dc\u00e7 farkl\u0131 durum s\u00f6z konusudur:<\/p>\n<ol>\n<li>\n        <strong>E\u011fer $k$ ilk yar\u0131daysa:<\/strong> Yani $1 \\le k < 2^n$. Bu durumda $k$-\u0131nc\u0131 karakter, do\u011frudan $S_{n-1}$ dizisindeki $k$-\u0131nc\u0131 karakterdir. Problemi $f(n, k) \\rightarrow f(n-1, k)$ olarak k\u00fc\u00e7\u00fcltebiliriz.\n    <\/li>\n<li>\n        <strong>E\u011fer $k$ orta karakterse:<\/strong> Yani $k = 2^n$. Bu durumda $k$-\u0131nc\u0131 karakter her zaman '1'dir.\n    <\/li>\n<li>\n        <strong>E\u011fer $k$ ikinci yar\u0131daysa:<\/strong> Yani $2^n < k \\le 2^{n+1} - 1$. Bu durumda $k$-\u0131nc\u0131 karakter, $\\text{reverse}(\\text{invert}(S_{n-1}))$ k\u0131sm\u0131nda yer al\u0131r.\n        \n\n<p>Bu k\u0131s\u0131mda karakteri bulmak i\u00e7in biraz d\u00f6n\u00fc\u015f\u00fcm yapmam\u0131z gerekir:<\/p>\n<ul>\n<li>\u00d6ncelikle, $k$ de\u011ferini $S_{n-1}$'in sonundan itibaren olan konumuna \u00e7evirmeliyiz. $S_n$'deki $k$ konumu, $S_{n-1}$'in sonundan $(2^{n+1} - 1) - k + 1$ uzakl\u0131ktad\u0131r. Ya da daha basit\u00e7e, $S_{n-1}$'in uzunlu\u011fu $2^n - 1$ oldu\u011fundan, $k$ konumunu orta '1'den sonraki k\u0131sma g\u00f6re ayarlayal\u0131m: $k' = k - (2^n)$. Bu $k'$ de\u011feri, $\\text{reverse}(\\text{invert}(S_{n-1}))$ dizisinin ba\u015flang\u0131c\u0131ndan itibaren olan konumdur.<\/li>\n<li>\u015eimdi, bu $k'$ konumundaki karakteri $\\text{reverse}(\\text{invert}(S_{n-1}))$ i\u00e7inde bulmal\u0131y\u0131z. $\\text{reverse}(X)$ i\u00e7indeki $k'$-\u0131nc\u0131 karakter, $X$ i\u00e7indeki $\\text{len}(X) - k' + 1$-inci karaktere e\u015fittir. Yani, $\\text{invert}(S_{n-1})$ i\u00e7indeki $(2^n - 1) - k' + 1$-inci karaktere.<\/li>\n<li>Son olarak, buldu\u011fumuz karakteri ters \u00e7evirmeliyiz (invert).<\/li>\n<\/ul>\n<p>Bu karma\u015f\u0131k d\u00f6n\u00fc\u015f\u00fcm\u00fc basitle\u015ftirelim: $S_n$'deki $k$-\u0131nc\u0131 karakter, $S_{n-1}$'in ters \u00e7evrilmi\u015f ve tersine \u00e7evrilmi\u015f halindeki bir karaktere kar\u015f\u0131l\u0131k gelir. $S_n$'deki $k$-\u0131nc\u0131 karakterin, $S_{n-1}$'in $\\text{len}(S_{n-1}) - (k - 2^n) + 1$ konumundaki karakterinin tersi oldu\u011funu buluruz. Yani, $k_{new} = \\text{len}(S_{n-1}) - (k - 2^n) + 1 = (2^n - 1) - (k - 2^n) + 1 = 2^{n+1} - k$. Problemi $f(n, k) \\rightarrow \\text{invert}(f(n-1, 2^{n+1} - k))$ olarak k\u00fc\u00e7\u00fcltebiliriz.<\/p>\n<\/li>\n<\/ol>\n<h3>5. Optimal \u00c7\u00f6z\u00fcm: \u0130kili Arama ve Bit Manip\u00fclasyonu<\/h3>\n<p>Yukar\u0131daki rek\u00fcrsif ili\u015fkiyi kullanarak, problemi her ad\u0131mda yar\u0131ya indirgeyebiliriz. Ayr\u0131ca, karakterlerin ters \u00e7evrilme (invert) durumunu takip etmek i\u00e7in bit manip\u00fclasyonu veya basit bir saya\u00e7 kullanabiliriz.<\/p>\n<h4>5.1. Problemi K\u00fc\u00e7\u00fcltme Stratejisi<\/h4>\n<p>Ana fikir, $k$-\u0131nc\u0131 karakteri bulmak i\u00e7in $n$ de\u011ferini azaltarak temel duruma ($S_0$) ula\u015fmakt\u0131r. Her ad\u0131mda, $k$'n\u0131n $S_n$'in hangi b\u00f6l\u00fcm\u00fcne d\u00fc\u015ft\u00fc\u011f\u00fcne bakar\u0131z:<\/p>\n<ul>\n<li>\n        <strong>Orta nokta:<\/strong> E\u011fer $k = 2^n$ ise, karakter '1'dir.\n    <\/li>\n<li>\n        <strong>Sol taraf:<\/strong> E\u011fer $k < 2^n$ ise, karakter $S_{n-1}$'deki $k$-\u0131nc\u0131 karakterle ayn\u0131d\u0131r. $n$ de\u011ferini $n-1$ yapar\u0131z, $k$ de\u011fi\u015fmez.\n    <\/li>\n<li>\n        <strong>Sa\u011f taraf:<\/strong> E\u011fer $k > 2^n$ ise, karakter $S_{n-1}$'deki bir karakterin tersidir. Yeni $k$ de\u011feri $2^{n+1} - k$ olur ve $n$ de\u011ferini $n-1$ yapar\u0131z. Ayr\u0131ca, bu ad\u0131mda bir ters \u00e7evirme (invert) i\u015flemi oldu\u011fu i\u00e7in, nihai sonucu bir kez daha ters \u00e7evirmemiz gerekti\u011fini not etmeliyiz. Bunu bir saya\u00e7 (\u00f6rne\u011fin <code>flips<\/code> de\u011fi\u015fkeni) ile takip edebiliriz.\n    <\/li>\n<\/ul>\n<h4>5.2. Orta Nokta ve Karakter Konumu<\/h4>\n<p>Her ad\u0131mda, mevcut $S_n$ dizisinin uzunlu\u011funu $L = 2^{n+1} - 1$ ve orta noktas\u0131n\u0131 $mid = (L+1)\/2 = 2^n$ olarak hesaplar\u0131z. Sonra $k$'y\u0131 bu $mid$ ile kar\u015f\u0131la\u015ft\u0131r\u0131r\u0131z.<\/p>\n<h4>5.3. Bit Manip\u00fclasyonunun Rol\u00fc<\/h4>\n<p>Asl\u0131nda, '0' ve '1' karakterleri ikili say\u0131lar olarak d\u00fc\u015f\u00fcn\u00fclebilir. Bir karakteri ters \u00e7evirmek, o biti flip etmek anlam\u0131na gelir. Ba\u015flang\u0131\u00e7 karakteri $S_0 = '0'$'d\u0131r. Her sa\u011f tarafa ge\u00e7ti\u011fimizde, bir invert i\u015flemi ger\u00e7ekle\u015fir. Bu invert i\u015flemlerinin say\u0131s\u0131n\u0131n tek mi \u00e7ift mi oldu\u011funu takip edebiliriz. E\u011fer toplam invert say\u0131s\u0131 tek ise, nihai karakterin tersini almal\u0131y\u0131z; \u00e7ift ise, karakter oldu\u011fu gibi kal\u0131r.<\/p>\n<p>Alternatif olarak, $S_0 = \"0\"$ oldu\u011fu i\u00e7in, $k$-\u0131nc\u0131 karakterin asl\u0131nda $S_0$ i\u00e7indeki '0'\u0131n ka\u00e7 kez flip edildi\u011fiyle ili\u015fkili oldu\u011funu d\u00fc\u015f\u00fcnebiliriz. $S_0$ tek karakterli bir dizedir ve bu karakter '0'd\u0131r. $S_n$ i\u00e7inde $k$-\u0131nc\u0131 karakterin de\u011ferini belirlemek i\u00e7in, $k-1$ say\u0131s\u0131n\u0131n ikili g\u00f6sterimindeki '1' say\u0131s\u0131n\u0131n (popcount) paritesini kullanabiliriz. E\u011fer $k-1$ i\u00e7indeki '1' say\u0131s\u0131 tekse, karakter '1'dir; \u00e7iftse, karakter '0'd\u0131r. Bu, $S_0 = \"0\"$ ve $S_i = S_{i-1} + '1' + S'_{i-1}$ (burada $S'_{i-1}$ invert edilmi\u015f) yap\u0131s\u0131n\u0131n bir sonucudur. Her invert i\u015flemi, karakterin de\u011ferini de\u011fi\u015ftirir. $k-1$ i\u00e7indeki '1' say\u0131s\u0131, asl\u0131nda o karaktere ula\u015fmak i\u00e7in ka\u00e7 kez \"sa\u011f tarafa\" ge\u00e7ildi\u011fini g\u00f6sterir.<\/p>\n<p>Daha do\u011fru bir ifadeyle, $k$-\u0131nc\u0131 karakterin de\u011ferini bulmak i\u00e7in, $k-1$ say\u0131s\u0131n\u0131n ikili g\u00f6sterimindeki '1' say\u0131s\u0131n\u0131n paritesine bakabiliriz. E\u011fer $S_0 = \"0\"$ olmasayd\u0131, bu do\u011frudan do\u011fru olmazd\u0131. Ancak $S_0 = \"0\"$ oldu\u011fu i\u00e7in, $k-1$ i\u00e7indeki set bit say\u0131s\u0131 (popcount) bize karakterin de\u011ferini verir. \u00d6rne\u011fin, $k=1$ i\u00e7in $k-1=0$, popcount=0, karakter '0'. $k=2$ i\u00e7in $k-1=1$, popcount=1, karakter '1'. $k=3$ i\u00e7in $k-1=2$, popcount=1, karakter '1'. Bu, $S_1 = \"011\"$ ile e\u015fle\u015fir. $k=4$ i\u00e7in $k-1=3$, popcount=2, karakter '0'. Bu, $S_2 = \"0111001\"$ ile e\u015fle\u015fmez. Demek ki bu basit bit manip\u00fclasyonu do\u011frudan \u00e7al\u0131\u015fm\u0131yor. \u00d6nceki rek\u00fcrsif yakla\u015f\u0131m daha sa\u011flam.<\/p>\n<p>Geri d\u00f6nelim rek\u00fcrsif yakla\u015f\u0131ma: $S_0 = \"0\"$. <code>flips<\/code> sayac\u0131 ile ka\u00e7 kez invert edildi\u011fini takip edelim. Ba\u015flang\u0131\u00e7ta <code>flips = 0<\/code>.<\/p>\n<ul>\n<li>E\u011fer $k = 2^n$ ise, karakter '1'dir. Nihai sonu\u00e7 <code>(1 + flips) % 2<\/code> olur.<\/li>\n<li>E\u011fer $k < 2^n$ ise, $n \\leftarrow n-1$, $k$ ayn\u0131 kal\u0131r.<\/li>\n<li>E\u011fer $k > 2^n$ ise, $n \\leftarrow n-1$, $k \\leftarrow 2^{n+1} - k$, <code>flips \\leftarrow flips + 1<\/code>.<\/li>\n<\/ul>\n<p>Temel durum $n=0, k=1$ oldu\u011funda $S_0 = \"0\"$'d\u0131r. Bu durumda nihai karakter <code>(0 + flips) % 2<\/code> olur.<\/p>\n<h3>6. Algoritman\u0131n Ad\u0131m Ad\u0131m \u0130ncelenmesi<\/h3>\n<p>\u015eimdi bu rek\u00fcrsif algoritmay\u0131 daha somut bir \u015fekilde inceleyelim.<\/p>\n<h4>6.1. Temel Durumlar<\/h4>\n<p>Rek\u00fcrsif fonksiyonun durma ko\u015fulu, $n=0$ ve $k=1$ oldu\u011funda ger\u00e7ekle\u015fir. Bu durumda, $S_0$ dizisinin tek karakteri olan '0'\u0131 d\u00f6nd\u00fcr\u00fcr\u00fcz. Ancak, bu '0' karakteri, yol boyunca ka\u00e7 kez ters \u00e7evrildi\u011fine ba\u011fl\u0131 olarak de\u011fi\u015febilir. Bu y\u00fczden, <code>flips<\/code> sayac\u0131n\u0131 da hesaba katmal\u0131y\u0131z.<\/p>\n<pre><code>\ndef find_kth_char(n, k):\n    # flips, karakterin ka\u00e7 kez ters \u00e7evrildi\u011fini tutar.\n    # Ba\u015flang\u0131\u00e7ta 0.\n    flips = 0\n\n    while n > 0:\n        length_sn_minus_1 = (1 << n) - 1 # S_{n-1} uzunlu\u011fu\n        mid_point = (1 << n) # S_n'deki orta '1'in konumu (1-indeksli)\n\n        if k == mid_point:\n            # Orta karakter her zaman '1'dir.\n            # Ancak yol boyunca flip edilmi\u015f olabilir.\n            return str((1 + flips) % 2)\n        elif k < mid_point:\n            # Karakter S_{n-1} i\u00e7inde. n'i azalt, k ayn\u0131 kal\u0131r.\n            n -= 1\n        else:\n            # Karakter S_{n-1}'in ters \u00e7evrilmi\u015f ve tersine \u00e7evrilmi\u015f k\u0131sm\u0131nda.\n            # Yeni k, S_{n-1} i\u00e7indeki simetrik konumudur.\n            # Bir flip i\u015flemi ger\u00e7ekle\u015fti.\n            k = length_sn_minus_1 - (k - mid_point) + 1\n            n -= 1\n            flips += 1\n            \n    # n=0 durumuna ula\u015f\u0131ld\u0131. S_0 = \"0\".\n    # flips say\u0131s\u0131na g\u00f6re nihai karakteri d\u00f6nd\u00fcr.\n    return str((0 + flips) % 2)\n\n<\/pre>\n<p><\/code><\/p>\n<h4>6.2. \u00d6zyineleme Ad\u0131mlar\u0131<\/h4>\n<p>Yukar\u0131daki d\u00f6ng\u00fc tabanl\u0131 \u00e7\u00f6z\u00fcm, asl\u0131nda rek\u00fcrsif bir fonksiyonun yinelemeli halidir. Her ad\u0131mda $n$ de\u011feri azal\u0131r, bu da logaritmik say\u0131da ad\u0131mda sonuca ula\u015faca\u011f\u0131m\u0131z anlam\u0131na gelir.<\/p>\n<h4>6.3. \u00d6rnek \u00c7al\u0131\u015fma (n=3, k=12 i\u00e7in)<\/h4>\n<p>Hedef: $S_3$ dizisindeki 12. karakter.<\/p>\n<ol>\n<li>\n        <strong>Ba\u015flang\u0131\u00e7:<\/strong> $n=3, k=12$, <code>flips=0<\/code>.\n    <\/li>\n<li>\n        <strong>Ad\u0131m 1 ($n=3$):<\/strong><\/p>\n<ul>\n<li>$\\text{len}(S_2) = 2^3 - 1 = 7$.<\/li>\n<li>$\\text{mid_point} = 2^3 = 8$.<\/li>\n<li>$k=12 > \\text{mid_point}=8$. Sa\u011f tarafa d\u00fc\u015ft\u00fc.<\/li>\n<li>Yeni $k = \\text{len}(S_2) - (k - \\text{mid_point}) + 1 = 7 - (12 - 8) + 1 = 7 - 4 + 1 = 4$.<\/li>\n<li>$n \\leftarrow 2$.<\/li>\n<li><code>flips \\leftarrow 1<\/code>.<\/li>\n<\/ul>\n<p>Durum: $n=2, k=4$, <code>flips=1<\/code>.<\/p>\n<\/li>\n<li>\n        <strong>Ad\u0131m 2 ($n=2$):<\/strong><\/p>\n<ul>\n<li>$\\text{len}(S_1) = 2^2 - 1 = 3$.<\/li>\n<li>$\\text{mid_point} = 2^2 = 4$.<\/li>\n<li>$k=4 == \\text{mid_point}=4$. Orta karaktere ula\u015f\u0131ld\u0131.<\/li>\n<li>D\u00f6nd\u00fcr: $\\text{str}((1 + \\text{flips}) \\% 2) = \\text{str}((1 + 1) \\% 2) = \\text{str}(2 \\% 2) = \\text{str}(0)$.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>Sonu\u00e7: '0'. Do\u011frulayal\u0131m: $S_3 = \"011100110110001\"$. 12. karakter ger\u00e7ekten '0'd\u0131r.<\/p>\n<h3>7. Karma\u015f\u0131kl\u0131k Analizi<\/h3>\n<p>Optimal \u00e7\u00f6z\u00fcm\u00fcn performans\u0131n\u0131 anlamak i\u00e7in zaman ve uzay karma\u015f\u0131kl\u0131klar\u0131n\u0131 inceleyelim.<\/p>\n<h4>7.1. Zaman Karma\u015f\u0131kl\u0131\u011f\u0131<\/h4>\n<p>Her ad\u0131mda $n$ de\u011feri 1 azal\u0131r ve $k$ de\u011feri ya ayn\u0131 kal\u0131r ya da yeni bir konuma ayarlan\u0131r. $n$ de\u011feri 0 olana kadar bu i\u015flem devam eder. Bu, $n$ kez tekrarlanan bir d\u00f6ng\u00fc veya rek\u00fcrsif \u00e7a\u011fr\u0131 anlam\u0131na gelir. Dolay\u0131s\u0131yla, zaman karma\u015f\u0131kl\u0131\u011f\u0131 $O(n)$'dir. $n$ genellikle 60'a kadar olabilece\u011finden, bu \u00e7ok verimli bir \u00e7\u00f6z\u00fcmd\u00fcr.<\/p>\n<h4>7.2. Uzay Karma\u015f\u0131kl\u0131\u011f\u0131<\/h4>\n<p>\u00c7\u00f6z\u00fcm, sabit say\u0131da de\u011fi\u015fken (n, k, flips) kullan\u0131r ve rek\u00fcrsif \u00e7a\u011fr\u0131 y<\/p>\n","protected":false},"excerpt":{"rendered":"Problem, $S_0 = &#8220;0&#8221;$ ile ba\u015flayan bir dize serisi tan\u0131mlar. Her bir sonraki dize $S_i$, $S_{i-1}$ dizisinden t\u00fcretilir. Kural \u015fu \u015fekildedir:","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-39280","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LeetCode 3304: Dize Oyununda K&#039;\u0131nc\u0131 Karakteri Anlamak (Ad\u0131m Ad\u0131m K\u0131lavuz) - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/leetcode-3304-dize-oyununda-kinci-karakteri-anlamak-adim-adim-kilavuz\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LeetCode 3304: Dize Oyununda K&#039;\u0131nc\u0131 Karakteri Anlamak (Ad\u0131m Ad\u0131m K\u0131lavuz)\" \/>\n<meta property=\"og:description\" content=\"Problem, $S_0 = &quot;0&quot;$ ile ba\u015flayan bir dize serisi tan\u0131mlar. 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Kodlar\u0131n Gizemli D\u00fcnyas\u0131","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/fatihsoysal.com\/blog\/leetcode-3304-dize-oyununda-kinci-karakteri-anlamak-adim-adim-kilavuz\/","og_locale":"tr_TR","og_type":"article","og_title":"LeetCode 3304: Dize Oyununda K'\u0131nc\u0131 Karakteri Anlamak (Ad\u0131m Ad\u0131m K\u0131lavuz)","og_description":"Problem, $S_0 = \"0\"$ ile ba\u015flayan bir dize serisi tan\u0131mlar. Her bir sonraki dize $S_i$, $S_{i-1}$ dizisinden t\u00fcretilir. 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