{"id":216692,"date":"2020-11-25T08:03:19","date_gmt":"2020-11-25T00:03:19","guid":{"rendered":"http:\/\/4563.org\/?p=216692"},"modified":"2020-11-25T08:03:19","modified_gmt":"2020-11-25T00:03:19","slug":"amazon-%e9%9d%a2%e8%af%95%e9%a2%98%ef%bc%9a%e6%bb%91%e5%8a%a8%e7%aa%97%e5%8f%a3%e5%86%85%e6%95%b0%e7%9a%84%e5%92%8c","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=216692","title":{"rendered":"Amazon \u9762\u8bd5\u9898\uff1a\u6ed1\u52a8\u7a97\u53e3\u5185\u6570\u7684\u548c"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  Amazon \u9762\u8bd5\u9898\uff1a\u6ed1\u52a8\u7a97\u53e3\u5185\u6570\u7684\u548c               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : zzzrf <\/span>  <span><i><\/i> 2<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<p>\u7ed9\u4f60\u4e00\u4e2a\u5927\u5c0f\u4e3a n \u7684\u6574\u578b\u6570\u7ec4\u548c\u4e00\u4e2a\u5927\u5c0f\u4e3a k \u7684\u6ed1\u52a8\u7a97\u53e3\uff0c\u5c06\u6ed1\u52a8\u7a97\u53e3\u4ece\u5934\u79fb\u5230\u5c3e\uff0c\u8f93\u51fa\u4ece\u5f00\u59cb\u5230\u7ed3\u675f\u6bcf\u4e00\u4e2a\u65f6\u523b\u6ed1\u52a8\u7a97\u53e3\u5185\u7684\u6570\u7684\u548c\u3002<\/p>\n<p>\u5728\u7ebf\u8bc4\u6d4b\u5730\u5740<\/p>\n<h2>\u6837\u4f8b 1<\/h2>\n<pre><code>\u8f93\u5165\uff1aarray = [1,2,7,8,5], k = 3 \u8f93\u51fa\uff1a[10,17,20] \u89e3\u6790\uff1a 1 + 2 + 7 = 10 2 + 7 + 8 = 17 7 + 8 + 5 = 20 <\/code><\/pre>\n<h2>\u7b97\u6cd5\uff1a\u524d\u7f00\u548c\uff0c\u6ed1\u52a8\u7a97\u53e3<\/h2>\n<ul>\n<li>\n<p>\u524d\u7f00\u548c\uff1a \u524d\u7f00\u548c\u5c31\u662f\u4e00\u4e2a\u6570\u5217\u7684\u524d n \u9879\u548c\uff0c\u524d\u7f00\u548c\u7684\u8ba1\u7b97\u975e\u5e38\u7b80\u5355\uff0c\u6211\u4eec\u53ea\u9700\u8981\u989d\u5916\u5f00\u4e00\u4e2a\u6570\u7ec4\u6765\u8bb0\u5f55\u5b83\u5c31\u597d\u4e86\u3002\u6bcf\u6b21\u6709\u65b0\u7684\u5143\u7d20\u51fa\u73b0\u6211\u4eec\u4ee4 sum[i] = sum[i &#8211; 1] + nums[i]\uff0c\u5176\u4e2d sum \u662f\u6211\u4eec\u7528\u6765\u8bb0\u5f55\u524d\u7f00\u548c\u7684\u6570\u7ec4\uff0cnums \u662f\u6211\u4eec\u8981\u8f93\u5165\u7684\u6570\u5217\uff0ci \u4ee3\u8868\u6570\u5217 nums \u4e2d\u7684\u7b2c i \u4e2a\u6570\u3002\u8fd9\u6837\u7684\u8bdd\u6211\u4eec\u4ec5\u4ec5\u9700\u8981 O(N)\u7684\u590d\u6742\u5ea6\u5c31\u53ef\u4ee5\u5b8c\u6210\u8ba1\u7b97\uff0c\u5728\u67e5\u8be2\u5bbd\u5ea6\u4e3a k \u7684\u533a\u95f4\u4e4b\u95f4\u7684\u503c\u7684\u65f6\u5019\uff0c\u53ea\u9700\u8981\u8ba1\u7b97 sum[i] &#8211; sum[i &#8211; k] + nums[i-k]\u5373\u53ef<\/p>\n<\/li>\n<li>\n<p>\u6ed1\u52a8\u7a97\u53e3\uff1a \u53ef\u4ee5\u7406\u89e3\u6210\u662f\u4e00\u4e2a\u4f1a\u6ed1\u52a8\u7684\u7a97\u53e3\uff0c\u6bcf\u6b21\u8bb0\u5f55\u4e0b\u7a97\u53e3\u7684\u72b6\u6001\uff0c\u518d\u627e\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u9002\u5408\u7684\u7a97\u53e3\uff0c\u8fd9\u9898\u8981\u6c42\u957f\u5ea6\u4e3a k\uff0c\u6211\u4eec\u7ef4\u62a4\u4e00\u4e2a\u533a\u95f4[l,r]\uff0c\u5148\u8ba1\u7b97\u8fd9\u4e2a\u533a\u95f4\u7684\u548c\uff0c\u7136\u540e\u6bcf\u6b21 l\uff0cr \u90fd\u5411\u53f3\u79fb\u52a8\u4e00\u4e2a\u5355\u4f4d\uff0c\u5e76\u51cf\u53bb nums[l]\uff0c\u52a0\u4e0a nums[r+1]\uff0c\u5f97\u5230\u65b0\u7684\u533a\u95f4\u7684\u548c\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>\u590d\u6742\u5ea6\u5206\u6790<\/h2>\n<p>n \u4e3a\u6570\u7ec4\u7684\u5927\u5c0f \u65f6\u95f4\u590d\u6742\u5ea6 O(n) \u7a7a\u95f4\u590d\u6742\u5ea6 O(n)<\/p>\n<pre><code>public class Solution {     \/**      * @param nums: a list of integers.      * @param k: length of window.      * @return: the sum of the element inside the window at each moving.      *\/     public int[] winSum(int[] nums, int k) {         if (k == 0) {             return new int[0];         }         int n = nums.length;         int[] sum = new int[n];         sum[0] = nums[0];         \/\/ \u8ba1\u7b97\u524d\u7f00\u548c         for (int i = 1;i &lt; n; i++) {             sum[i] = sum[i - 1] + nums[i];         }         k--;         int[] res = new int[n - k];         for (int i = k;i &lt; n; i++) {             res[i - k]= sum[i] - sum[i - k] + nums[i-k];         }         return res;     } }\/\/\u6ed1\u52a8\u7a97\u53e3 public class Solution {     \/**      * @param nums: a list of integers.      * @param k: length of window.      * @return: the sum of the element inside the window at each moving.      *\/     public int[] winSum(int[] nums, int k) {         if (k == 0) {             return new int[0];         }         int n = nums.length;         int l = 0,r = k - 1,sum = 0;         \/\/\u8ba1\u7b97\u521d\u59cb\u7a97\u53e3\u7684\u548c         for (int i = 0; i &lt; k; i++) {             sum += nums[i];         }         int[] res = new int[n - k + 1];         int index = 0;         res[index++] = sum;         while (r &lt; n - 1) {             sum -= nums[l];             l++;r++;\/\/\u7a97\u53e3\u53f3\u79fb             sum += nums[r];             res[index++] = sum;         }         return res;     } }  <\/code><\/pre>\n<\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>0<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>Amazon \u9762\u8bd5\u9898\uff1a\u6ed1\u52a8\u7a97\u53e3\u5185\u6570&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/216692"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=216692"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/216692\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=216692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=216692"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=216692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}