{"id":344355,"date":"2021-02-11T06:18:19","date_gmt":"2021-02-10T22:18:19","guid":{"rendered":"http:\/\/4563.org\/?p=344355"},"modified":"2021-02-11T06:18:19","modified_gmt":"2021-02-10T22:18:19","slug":"google-%e9%9d%a2%e8%af%95%e9%a2%98%ef%bc%9a%e9%80%86%e5%ba%8f%e5%af%b9","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=344355","title":{"rendered":"Google \u9762\u8bd5\u9898\uff1a\u9006\u5e8f\u5bf9"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  Google \u9762\u8bd5\u9898\uff1a\u9006\u5e8f\u5bf9               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : zzzrf <\/span>  <span><i><\/i> 6<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<h3>\u63cf\u8ff0<\/h3>\n<p>\u5728\u6570\u7ec4\u4e2d\u7684\u4e24\u4e2a\u6570\u5b57\u5982\u679c\u524d\u9762\u4e00\u4e2a\u6570\u5b57\u5927\u4e8e\u540e\u9762\u7684\u6570\u5b57\uff0c\u5219\u8fd9\u4e24\u4e2a\u6570\u5b57\u7ec4\u6210\u4e00\u4e2a\u9006\u5e8f\u5bf9\u3002\u7ed9\u4f60\u4e00\u4e2a\u6570\u7ec4\uff0c\u6c42\u51fa\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u9006\u5e8f\u5bf9\u7684\u603b\u6570\u3002 \u6982\u62ec\uff1a\u5982\u679c a[i] &gt; a[j] \u4e14 i &lt; j\uff0ca[i] \u548c a[j] \u6784\u6210\u4e00\u4e2a\u9006\u5e8f\u5bf9\u3002<\/p>\n<p>\u5728\u7ebf\u8bc4\u6d4b\u5730\u5740<\/p>\n<h3>\u6837\u4f8b 1<\/h3>\n<pre><code>\u8f93\u5165: A = [2, 4, 1, 3, 5] \u8f93\u51fa: 3 \u89e3\u91ca: (2, 1), (4, 1), (4, 3) \u662f\u9006\u5e8f\u5bf9 <\/code><\/pre>\n<h3>\u6837\u4f8b 2<\/h3>\n<pre><code>\u8f93\u5165: A = [1, 2, 3, 4] \u8f93\u51fa: 0 \u89e3\u91ca: \u6ca1\u6709\u9006\u5e8f\u5bf9 <\/code><\/pre>\n<p>\u5229\u7528\u5f52\u5e76\u6392\u5e8f\u7684\u601d\u60f3\u6c42\u9006\u5e8f\u5bf9\uff0c\u590d\u6742\u5ea6 O(nlogn) \u5f53\u7136\u4e5f\u53ef\u4ee5\u7528\u6811\u72b6\u6570\u7ec4\u6216\u8005\u7ebf\u6bb5\u6811\u6c42\u89e3<\/p>\n<pre><code>class Solution:     # @param {int[]} A an array     # @return {int} total of reverse pairs     def reversePairs(self, A):         # Write your code here         self.tmp = [0] * len(A)         return self.mergeSort(A, 0, len(A) - 1)      def mergeSort(self, A, l, r):         if l &gt;= r:             return 0                  m = (l + r) &gt;&gt; 1         ans = self.mergeSort(A, l, m) + self.mergeSort(A, m + 1, r)         i, j, k = l, m + 1, l         while i &lt;= m and j &lt;= r:             if A[i] &gt; A[j]:                 self.tmp[k] = A[j]                 j += 1                 ans += m - i + 1             else:                 self.tmp[k] = A[i]                 i += 1             k += 1              while i &lt;= m:             self.tmp[k] = A[i]             k += 1             i += 1         while j &lt;= r:             self.tmp[k] = A[j]             k += 1             j += 1         for i in xrange(l, r + 1):             A[i] = self.tmp[i]          return ans <\/code><\/pre>\n<p>\u66f4\u591a\u9898\u89e3\u53c2\u8003<\/p>\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>Google \u9762\u8bd5\u9898\uff1a\u9006\u5e8f\u5bf9 \u8cc7\u6df1&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\/344355"}],"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=344355"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/344355\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=344355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=344355"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=344355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}