{"id":10326,"date":"2025-04-10T21:21:38","date_gmt":"2025-04-11T04:21:38","guid":{"rendered":"https:\/\/zxi.mytechroad.com\/blog\/?p=10326"},"modified":"2025-04-10T21:28:23","modified_gmt":"2025-04-11T04:28:23","slug":"leetcode-2012-sum-of-beauty-in-the-array","status":"publish","type":"post","link":"https:\/\/zxi.mytechroad.com\/blog\/algorithms\/array\/leetcode-2012-sum-of-beauty-in-the-array\/","title":{"rendered":"\u82b1\u82b1\u9171 LeetCode 2012. Sum of Beauty in the Array"},"content":{"rendered":"\n<p>\u6570\u636e\u89c4\u6a21\u6bd4\u8f83\u5927\uff0c\u7b97\u6cd5\u5fc5\u987b\u662fO(n)\u7684\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5\u9884\u5148\u4f7f\u7528O(n)\u65f6\u95f4\u8ba1\u7b97nums[0] .. nums[i]\u7684\u6700\u5927\u503c\uff0c\u5b58\u5728left[i]\u4e2d\uff0c\u4ee5\u53canums[i] .. nums[n-1]\u7684\u6700\u5c0f\u503c\u5b58\u5728right[i]\u4e2d\u3002\u7136\u540e\u518d\u6309\u9898\u76ee\u7684\u5b9a\u4e49\u8ba1\u7b97\u5373\u53ef\u3002<\/p>\n\n\n\n<p>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n)<br>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(n)<\/p>\n\n\n\n<pre lang=\"c++\">\nclass Solution {\npublic:\n  int sumOfBeauties(vector<int>& nums) {\n    const int n = nums.size();\n    vector<int> left(n, nums[0]);\n    vector<int> right(n, nums.back());\n    for (int i = 1; i < n; ++i)\n      left[i] = max(left[i - 1], nums[i]);\n    for (int i = n - 2; i >= 0; --i)\n      right[i] = min(right[i + 1], nums[i]);\n    int ans = 0;\n    for (int i = 1; i < n - 1; ++i)\n      if (left[i - 1] < nums[i] &#038;&#038; nums[i] < right[i + 1])\n        ans += 2;\n      else if (nums[i - 1] < nums[i] &#038;&#038; nums[i] < nums[i + 1])\n        ans += 1;\n    return ans;\n  }\n};\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u636e\u89c4\u6a21\u6bd4\u8f83\u5927\uff0c\u7b97\u6cd5\u5fc5\u987b\u662fO(n)\u7684\u3002 \u53ef\u4ee5\u9884\u5148\u4f7f\u7528O(n)\u65f6\u95f4\u8ba1\u7b97nums[0] .. nums[i]\u7684\u6700\u5927\u503c\uff0c\u5b58\u5728left[i]\u4e2d\uff0c\u4ee5\u53canums[i] .. nums[n-1]\u7684\u6700\u5c0f\u503c\u5b58\u5728right[i]\u4e2d\u3002\u7136\u540e\u518d\u6309\u9898\u76ee\u7684\u5b9a\u4e49\u8ba1\u7b97\u5373\u53ef\u3002 \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n)\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(n) class Solution { public: int sumOfBeauties(vector&#038; nums) { const int n = nums.size(); vector left(n, nums[0]); vector right(n,&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[184],"tags":[20,177,97,842],"class_list":["post-10326","post","type-post","status-publish","format-standard","hentry","category-array","tag-array","tag-medium","tag-prefix","tag-prefix-max","entry","simple"],"_links":{"self":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/10326","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=10326"}],"version-history":[{"count":3,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/10326\/revisions"}],"predecessor-version":[{"id":10331,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/10326\/revisions\/10331"}],"wp:attachment":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/media?parent=10326"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/categories?post=10326"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/tags?post=10326"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}