{"id":10337,"date":"2025-04-11T09:24:45","date_gmt":"2025-04-11T16:24:45","guid":{"rendered":"https:\/\/zxi.mytechroad.com\/blog\/?p=10337"},"modified":"2025-04-11T09:25:16","modified_gmt":"2025-04-11T16:25:16","slug":"leetcode-2023-number-of-pairs-of-strings-with-concatenation-equal-to-target","status":"publish","type":"post","link":"https:\/\/zxi.mytechroad.com\/blog\/string\/leetcode-2023-number-of-pairs-of-strings-with-concatenation-equal-to-target\/","title":{"rendered":"\u82b1\u82b1\u9171 LeetCode 2023. Number of Pairs of Strings With Concatenation Equal to Target"},"content":{"rendered":"\n<p>\u65b9\u6cd51: Brute Force<\/p>\n\n\n\n<p>\u679a\u4e3e\u6240\u6709\u7684(nums[i], nums[j])\u7ec4\u5408\uff0c\u76f8\u52a0\u5728\u548ctarget\u6bd4\u8f83\u3002<\/p>\n\n\n\n<p>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(mn<sup>2<\/sup>) m\u4e3a\u5b57\u7b26\u4e32\u7684\u6700\u957f\u957f\u5ea6\u3002<br>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(m)<\/p>\n\n\n\n<p>\u4f18\u5316\u524d 67ms, 49.3M<\/p>\n\n\n\n<pre lang=\"c++\">\nclass Solution {\npublic:\n  int numOfPairs(vector<string>& nums, string target) {\n    const int n = nums.size();\n    int ans = 0;\n    for (int i = 0; i < n; ++i)\n      for (int j = 0; j < n; ++j)\n        if (i != j &#038;&#038; nums[i] + nums[j] == target)\n          ++ans;\n    return ans;\n  }\n};\n<\/pre>\n\n\n\n<p>\u4e00\u4e9b\u5de5\u7a0b\u4e0a\u7684\u4f18\u5316<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7528string_view\u4f5c\u4e3a\u53c2\u6570\u7c7b\u578b\uff0c\u51cf\u5c11\u4e00\u6b21string copy<\/li>\n\n\n\n<li>\u5148\u6bd4\u8f83\u957f\u5ea6\uff0c\u518d\u5224\u65ad\u5185\u5bb9\u3002<\/li>\n\n\n\n<li>string_view.substr \u662fO(1)\u65f6\u95f4\uff0c\u548c\u76f4\u63a5\u7528strncmp\u6bd4\u8f83\u5185\u5bb9\u662f\u4e00\u6837\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4f18\u5316\u540e 3ms, 12.88MB<\/p>\n\n\n\n<pre lang=\"c++\">\nclass Solution {\npublic:\n  int numOfPairs(vector<string>& nums, string_view target) {\n    const int n = nums.size();\n    int ans = 0;\n    for (int i = 0; i < n; ++i)\n      for (int j = 0; j < n; ++j)\n        if (i != j \n            &#038;&#038; nums[i].size() + nums[j].size() == target.size()\n            &#038;&#038; target.substr(0, nums[i].size()) == nums[i]\n            &#038;&#038; target.substr(nums[i].size()) == nums[j])\n              ++ans;\n    return ans;\n  }\n};\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u65b9\u6cd51: Brute Force \u679a\u4e3e\u6240\u6709\u7684(nums[i], nums[j])\u7ec4\u5408\uff0c\u76f8\u52a0\u5728\u548ctarget\u6bd4\u8f83\u3002 \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(mn2) m\u4e3a\u5b57\u7b26\u4e32\u7684\u6700\u957f\u957f\u5ea6\u3002\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(m) \u4f18\u5316\u524d 67ms, 49.3M class Solution { public: int numOfPairs(vector&#038; nums, string target) { const int n = nums.size();&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[177,4,843],"class_list":["post-10337","post","type-post","status-publish","format-standard","hentry","category-string","tag-medium","tag-string","tag-string_view","entry","simple"],"_links":{"self":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/10337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/comments?post=10337"}],"version-history":[{"count":4,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/10337\/revisions"}],"predecessor-version":[{"id":10342,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/10337\/revisions\/10342"}],"wp:attachment":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/media?parent=10337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/categories?post=10337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/tags?post=10337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}