{"id":8427,"date":"2025-01-02T18:00:15","date_gmt":"2025-01-02T15:00:15","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/on-ek-toplami-prefix-sum-nedir-ve-nasil-kullanilir\/"},"modified":"2025-01-02T18:00:15","modified_gmt":"2025-01-02T15:00:15","slug":"on-ek-toplami-prefix-sum-nedir-ve-nasil-kullanilir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/on-ek-toplami-prefix-sum-nedir-ve-nasil-kullanilir\/","title":{"rendered":"\u00d6n Ek Toplam\u0131 (Prefix Sum) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?"},"content":{"rendered":"<p>\u00d6n Ek Toplam\u0131 (Prefix Sum) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?<\/p>\n<p>Merhaba, ben Fatih Soysal. Bu yaz\u0131da, programlamada s\u0131k\u00e7a kullan\u0131lan ve bir\u00e7ok problemi \u00e7\u00f6zmede olduk\u00e7a etkili bir teknik olan \u00d6n Ek Toplam\u0131 (Prefix Sum) algoritmas\u0131n\u0131 detayl\u0131 bir \u015fekilde ele alaca\u011f\u0131z.  \u00d6n ek toplam\u0131, bir dizinin belirli bir aral\u0131\u011f\u0131ndaki elemanlar\u0131n toplam\u0131n\u0131 h\u0131zl\u0131 bir \u015fekilde hesaplamam\u0131z\u0131 sa\u011flar.  Bu, \u00f6zellikle b\u00fcy\u00fck dizilerde performans a\u00e7\u0131s\u0131ndan b\u00fcy\u00fck avantajlar sunar.<\/p>\n<h2>\u00d6n Ek Toplam\u0131 Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n<p>\u00d6n ek toplam\u0131,  bir dizinin her bir eleman\u0131n\u0131n, kendisinden \u00f6nceki t\u00fcm elemanlar\u0131n toplam\u0131 ile birlikte tutuldu\u011fu yeni bir dizi olu\u015fturarak \u00e7al\u0131\u015f\u0131r.  \u00d6rne\u011fin,  <code>[1, 2, 3, 4, 5]<\/code> dizisi i\u00e7in \u00f6n ek toplam dizisi <code>[1, 3, 6, 10, 15]<\/code> olur.  Burada her eleman, kendisinden \u00f6nceki elemanlar\u0131n toplam\u0131 ile birlikte olu\u015fturulmu\u015ftur.  Bu sayede,  dizinin herhangi bir aral\u0131\u011f\u0131ndaki elemanlar\u0131n toplam\u0131n\u0131,  \u00f6n ek toplam dizisini kullanarak  O(1) zaman karma\u015f\u0131kl\u0131\u011f\u0131nda hesaplayabiliriz.<\/p>\n<p>Mesela, <code>[1, 2, 3, 4, 5]<\/code> dizisinin 2. ve 4. elemanlar\u0131 aras\u0131ndaki toplam\u0131 hesaplamak istiyorsak (yani 2+3+4),  \u00f6n ek toplam dizisinin 4. eleman\u0131ndan (10) 1. eleman\u0131n\u0131 (1) \u00e7\u0131kararak sonucu (9) elde ederiz.  Bu i\u015flem,  dizide do\u011frudan toplama yapmaktan \u00e7ok daha h\u0131zl\u0131d\u0131r, \u00f6zellikle de b\u00fcy\u00fck diziler i\u00e7in.<\/p>\n<h2>\u00d6n Ek Toplam\u0131n\u0131n Uygulama Alanlar\u0131<\/h2>\n<p>\u00d6n ek toplam\u0131,  bir\u00e7ok farkl\u0131 alanda kullan\u0131l\u0131r.  Bunlardan baz\u0131lar\u0131 \u015funlard\u0131r:<\/p>\n<ul>\n<li><strong>Aral\u0131k Toplamlar\u0131:<\/strong> Bir dizinin belirli bir aral\u0131\u011f\u0131ndaki elemanlar\u0131n toplam\u0131n\u0131 h\u0131zl\u0131 bir \u015fekilde hesaplamak i\u00e7in kullan\u0131l\u0131r.  Bu,  veri analizi ve istatistiksel hesaplamalarda olduk\u00e7a faydal\u0131d\u0131r.<\/li>\n<li><strong>\u0130ki Boyutlu Diziler:<\/strong>  \u0130ki boyutlu dizilerde de kullan\u0131labilir. Bu durumda, her bir h\u00fccre i\u00e7in,  o h\u00fccreye kadar olan t\u00fcm h\u00fccrelerin toplam\u0131 hesaplan\u0131r.  B\u00f6ylece,  iki boyutlu bir dizinin belirli bir b\u00f6lgesindeki elemanlar\u0131n toplam\u0131 h\u0131zl\u0131ca bulunabilir.<\/li>\n<li><strong>Veri Basitli\u011fi:<\/strong> Veri setlerinde baz\u0131 i\u015flemleri kolayla\u015ft\u0131r\u0131r, performans\u0131 art\u0131r\u0131r.  \u00d6rne\u011fin, s\u0131k\u00e7a aral\u0131k toplamlar\u0131 hesaplanmas\u0131 gereken durumlarda, \u00f6n ek toplam kullan\u0131m\u0131 \u00e7ok daha verimlidir. <\/li>\n<\/ul>\n<h2>\u00d6n Ek Toplam\u0131 Kod \u00d6rne\u011fi (Python)<\/h2>\n<pre><code class=\"language-python\">\ndef prefix_sum(arr):\n  n = len(arr)\n  prefix_sum_arr = [0] * n\n  prefix_sum_arr[0] = arr[0]\n  for i in range(1, n):\n    prefix_sum_arr[i] = prefix_sum_arr[i-1] + arr[i]\n  return prefix_sum_arr\n\narr = [1, 2, 3, 4, 5]\nprefix_sum_arr = prefix_sum(arr)\nprint(f\"\u00d6n ek toplam dizisi: {prefix_sum_arr}\")  # \u00c7\u0131kt\u0131: \u00d6n ek toplam dizisi: [1, 3, 6, 10, 15]\n\n# 2. ve 4. elemanlar aras\u0131 toplam:\nprint(f\"2. ve 4. elemanlar aras\u0131 toplam: {prefix_sum_arr[3] - prefix_sum_arr[1] + arr[1]}\") # \u00c7\u0131kt\u0131: 2. ve 4. elemanlar aras\u0131 toplam: 9\n\n<\/code><\/pre>\n<p>Bu \u00f6rnekte,  Python kullanarak bir \u00f6n ek toplam fonksiyonu tan\u0131mlad\u0131k ve nas\u0131l kullan\u0131laca\u011f\u0131n\u0131 g\u00f6sterdik.  G\u00f6rd\u00fc\u011f\u00fcn\u00fcz gibi,  \u00f6n ek toplam\u0131 kullanarak aral\u0131k toplamlar\u0131n\u0131 olduk\u00e7a kolay ve h\u0131zl\u0131 bir \u015fekilde hesaplayabiliyoruz.<\/p>\n<p>Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\" target=\"_blank\">web sitemi<\/a> ziyaret edebilirsiniz.  Ayr\u0131ca, konuyla ilgili daha derinlemesine bilgi edinmek i\u00e7in <a href=\"https:\/\/dev.to\/mujahida_joynab_64c7407d8\/prefix-sum-2ig8\" target=\"_blank\">bu \u0130ngilizce kayna\u011f\u0131<\/a> inceleyebilirsiniz.<\/p>\n<p>#Etiketler: \u00d6n Ek Toplam\u0131, Prefix Sum, Algoritma, Programlama, Python, Aral\u0131k Toplam\u0131, Veri Analizi, Performans, Zaman Karma\u015f\u0131kl\u0131\u011f\u0131,  Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"\u00d6n Ek Toplam\u0131 (Prefix Sum) Nedir ve Nas\u0131l Kullan\u0131l\u0131r? Merhaba, ben Fatih Soysal. Bu yaz\u0131da, programlamada s\u0131k\u00e7a kullan\u0131lan&hellip;","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-8427","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>\u00d6n Ek Toplam\u0131 (Prefix Sum) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?<\/title>\n<meta name=\"description\" content=\"Merhaba, ben Fatih Soysal. Bu yaz\u0131da, programlamada s\u0131k\u00e7a kullan\u0131lan ve bir\u00e7ok problemi \u00e7\u00f6zmede olduk\u00e7a etkili bir teknik olan \u00d6n Ek Toplam\u0131 (Prefix Sum) algoritmas\u0131n\u0131 detayl\u0131 bir \u015fekilde ele alaca\u011f\u0131z. \u00d6n ek toplam\u0131, bir dizinin belirli bir aral\u0131\u011f\u0131ndaki elemanlar\u0131n toplam\u0131n\u0131 h\u0131zl\u0131 bir \u015fekilde hesaplamam\u0131z\u0131 sa\u011flar. Bu, \u00f6zellikle b\u00fcy\u00fck dizilerde performans a\u00e7\u0131s\u0131ndan b\u00fcy\u00fck avantajlar sunar.\" \/>\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\/on-ek-toplami-prefix-sum-nedir-ve-nasil-kullanilir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00d6n Ek Toplam\u0131 (Prefix Sum) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?\" \/>\n<meta property=\"og:description\" content=\"Merhaba, ben Fatih Soysal. Bu yaz\u0131da, programlamada s\u0131k\u00e7a kullan\u0131lan ve bir\u00e7ok problemi \u00e7\u00f6zmede olduk\u00e7a etkili bir teknik olan \u00d6n Ek Toplam\u0131 (Prefix Sum) algoritmas\u0131n\u0131 detayl\u0131 bir \u015fekilde ele alaca\u011f\u0131z. \u00d6n ek toplam\u0131, bir dizinin belirli bir aral\u0131\u011f\u0131ndaki elemanlar\u0131n toplam\u0131n\u0131 h\u0131zl\u0131 bir \u015fekilde hesaplamam\u0131z\u0131 sa\u011flar. 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Bu yaz\u0131da, programlamada s\u0131k\u00e7a kullan\u0131lan ve bir\u00e7ok problemi \u00e7\u00f6zmede olduk\u00e7a etkili bir teknik olan \u00d6n Ek Toplam\u0131 (Prefix Sum) algoritmas\u0131n\u0131 detayl\u0131 bir \u015fekilde ele alaca\u011f\u0131z. \u00d6n ek toplam\u0131, bir dizinin belirli bir aral\u0131\u011f\u0131ndaki elemanlar\u0131n toplam\u0131n\u0131 h\u0131zl\u0131 bir \u015fekilde hesaplamam\u0131z\u0131 sa\u011flar. Bu, \u00f6zellikle b\u00fcy\u00fck dizilerde performans a\u00e7\u0131s\u0131ndan b\u00fcy\u00fck avantajlar sunar.","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\/on-ek-toplami-prefix-sum-nedir-ve-nasil-kullanilir\/","og_locale":"tr_TR","og_type":"article","og_title":"\u00d6n Ek Toplam\u0131 (Prefix Sum) Nedir ve Nas\u0131l Kullan\u0131l\u0131r?","og_description":"Merhaba, ben Fatih Soysal. Bu yaz\u0131da, programlamada s\u0131k\u00e7a kullan\u0131lan ve bir\u00e7ok problemi \u00e7\u00f6zmede olduk\u00e7a etkili bir teknik olan \u00d6n Ek Toplam\u0131 (Prefix Sum) algoritmas\u0131n\u0131 detayl\u0131 bir \u015fekilde ele alaca\u011f\u0131z. \u00d6n ek toplam\u0131, bir dizinin belirli bir aral\u0131\u011f\u0131ndaki elemanlar\u0131n toplam\u0131n\u0131 h\u0131zl\u0131 bir \u015fekilde hesaplamam\u0131z\u0131 sa\u011flar. 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