{"id":748,"date":"2020-09-26T11:18:09","date_gmt":"2020-09-26T03:18:09","guid":{"rendered":"http:\/\/39.96.58.60\/?p=748"},"modified":"2022-10-18T16:37:28","modified_gmt":"2022-10-18T08:37:28","slug":"leetcode-1310-%e5%ad%90%e6%95%b0%e7%bb%84%e5%bc%82%e6%88%96%e6%9f%a5%e8%af%a2","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=748","title":{"rendered":"Leetcode 1310. \u5b50\u6570\u7ec4\u5f02\u6216\u67e5\u8be2"},"content":{"rendered":"<p>\u6709\u4e00\u4e2a\u6b63\u6574\u6570\u6570\u7ec4&nbsp;<code>arr<\/code>\uff0c\u73b0\u7ed9\u4f60\u4e00\u4e2a\u5bf9\u5e94\u7684\u67e5\u8be2\u6570\u7ec4&nbsp;<code>queries<\/code>\uff0c\u5176\u4e2d&nbsp;<code>queries[i] = [L<sub>i,&nbsp;<\/sub>R<sub>i<\/sub>]<\/code>\u3002<\/p>\n<p>\u5bf9\u4e8e\u6bcf\u4e2a\u67e5\u8be2&nbsp;<code>i<\/code>\uff0c\u8bf7\u4f60\u8ba1\u7b97\u4ece&nbsp;<code>L<sub>i<\/sub><\/code>&nbsp;\u5230&nbsp;<code>R<sub>i<\/sub><\/code>&nbsp;\u7684&nbsp;<strong>XOR<\/strong>&nbsp;\u503c\uff08\u5373&nbsp;<code>arr[L<sub>i<\/sub>] <strong>xor<\/strong> arr[L<sub>i+1<\/sub>] <strong>xor<\/strong> ... <strong>xor<\/strong> arr[R<sub>i<\/sub>]<\/code>\uff09\u4f5c\u4e3a\u672c\u6b21\u67e5\u8be2\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u7ed9\u5b9a\u67e5\u8be2&nbsp;<code>queries<\/code>&nbsp;\u6240\u6709\u7ed3\u679c\u7684\u6570\u7ec4\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u793a\u4f8b 1\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>arr = [1,3,4,8], queries = [[0,1],[1,2],[0,3],[3,3]]\n\n<strong>\u8f93\u51fa\uff1a<\/strong>[2,7,14,8] \n\n<strong>\u89e3\u91ca\uff1a<\/strong>\n\n\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u5f62\u5f0f\u662f\uff1a\n\n1 = 0001 \n\n3 = 0011 \n\n4 = 0100 \n\n8 = 1000 \n\n\u67e5\u8be2\u7684 XOR \u503c\u4e3a\uff1a\n\n[0,1] = 1 xor 3 = 2 \n\n[1,2] = 3 xor 4 = 7 \n\n[0,3] = 1 xor 3 xor 4 xor 8 = 14 \n\n[3,3] = 8\n\n<\/pre>\n<p><strong>\u793a\u4f8b 2\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>arr = [4,8,2,10], queries = [[2,3],[1,3],[0,0],[0,3]]\n\n<strong>\u8f93\u51fa\uff1a<\/strong>[8,0,4,4]\n\n<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\u63d0\u793a\uff1a<\/strong><\/p>\n<ul>\n<li><code>1 &lt;= arr.length &lt;= 3 *&nbsp;10^4<\/code><\/li>\n<li><code>1 &lt;= arr[i] &lt;= 10^9<\/code><\/li>\n<li><code>1 &lt;= queries.length &lt;= 3 * 10^4<\/code><\/li>\n<li><code>queries[i].length == 2<\/code><\/li>\n<li><code>0 &lt;= queries[i][0] &lt;= queries[i][1] &lt; arr.length<\/code><\/li>\n<\/ul>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u4f4d\u8fd0\u7b97\u3001<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-python\" data-lang=\"Python\"><code>\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a468 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8685.90% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a28 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e865.88% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    a^b = c\n    c^a = b\n    c^b = a\n    \u5148\u8bb0\u5f550~n\u7684\u5f02\u6216\u503c\n    \u7136\u540e\uff0c[q,p] \u7684\u5f02\u6216\u503c = record[p] ^ record[q-1]\n\"\"\"\nclass Solution:\n    def xorQueries(self, arr: List[int], queries: List[List[int]]) -&gt; List[int]:\n        result = []\n        record = {-1:0}\n        for i, a in enumerate(arr):\n            record[i] = record[i-1] ^ arr[i]    # \u8bb0\u5f55\u6bcf\u4e00\u4f4d\u4e4b\u524d\u7684\u5f02\u6216\u503c\n        for q in queries:\n            result.append(record[q[1]]^record[q[0]-1])  # \u76f4\u63a5\u8ba1\u7b97\u5f02\u6216\u503c   # a^b=c c^a=b c^b=a\n        return result<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u6709\u4e00\u4e2a\u6b63\u6574\u6570\u6570\u7ec4&nbsp;arr\uff0c\u73b0\u7ed9\u4f60\u4e00\u4e2a\u5bf9\u5e94\u7684\u67e5\u8be2\u6570\u7ec4&nbsp;queries\uff0c\u5176\u4e2d&nbsp;que&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/748"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=748"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/748\/revisions"}],"predecessor-version":[{"id":749,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/748\/revisions\/749"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=748"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}