{"id":49033,"date":"2025-07-30T14:51:44","date_gmt":"2025-07-30T06:51:44","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/49033.html"},"modified":"2025-07-30T14:51:44","modified_gmt":"2025-07-30T06:51:44","slug":"%e4%bb%a3%e7%a0%81%e9%9a%8f%e6%83%b3%e5%bd%95%e7%ae%97%e6%b3%95%e8%ae%ad%e7%bb%83%e8%90%a5%e7%ac%ac%e4%b8%83%e5%a4%a9leetcode454-%e5%9b%9b%e6%95%b0%e7%9b%b8%e5%8a%a0-ii%ef%bc%8cleetcode383","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/49033.html","title":{"rendered":"\u4ee3\u7801\u968f\u60f3\u5f55\u7b97\u6cd5\u8bad\u7ec3\u8425\u7b2c\u4e03\u5929|LeetCode454. \u56db\u6570\u76f8\u52a0 II\uff0cLeetCode383. \u8d4e\u91d1\u4fe1\uff0cLeetCode15. \u4e09\u6570\u4e4b\u548c\uff0cLeetCode18. \u56db\u6570\u4e4b\u548c"},"content":{"rendered":"

LeetCode454. \u56db\u6570\u76f8\u52a0 II<\/h2>\n

\u9898\u76ee\u94fe\u63a5：454. \u56db\u6570\u76f8\u52a0 II – \u529b\u6263（LeetCode） \u6587\u7ae0\u8bb2\u89e3：\u4ee3\u7801\u968f\u60f3\u5f55 \u89c6\u9891\u8bb2\u89e3：\u5b66\u900f\u54c8\u5e0c\u8868，map\u4f7f\u7528\u6709\u6280\u5de7！LeetCode：454.\u56db\u6570\u76f8\u52a0II_\u54d4\u54e9\u54d4\u54e9_bilibili\u00a0<\/p>\n

\u601d\u8def：\u8fd9\u4e2a\u9898\u5f88\u81ea\u7136\u53ef\u4ee5\u60f3\u5230\u4e00\u4e2a\u56db\u5c42\u5faa\u73af\u7684\u601d\u8def，\u90a3\u6837\u505a\u65f6\u95f4\u590d\u6742\u5ea6\u662fo(n^4)，\u4f1a\u8d85\u65f6，\u6240\u4ee5\u662f\u4e0d\u5bf9\u7684\u3002\u6b63\u786e\u7684\u505a\u6cd5\u53ef\u4ee5\u5316\u4e3a\u4e24\u4e2a\u4e8c\u5c42\u5faa\u73af，\u8fd9\u6837\u53ef\u4ee5\u628a\u65f6\u95f4\u590d\u6742\u5ea6\u964d\u81f3o(n^2)\u3002\u5148\u628aa+b\u4f5c\u4e3akey，\u800ca+b\u51fa\u73b0\u7684\u6b21\u6570\u4f5c\u4e3avalue，\u5b58\u5165map\u4e2d\u3002\u7136\u540e\u5728\u53e6\u4e00\u4e2a\u4e8c\u5c42\u5faa\u73af\u4e2d\u627emap\u662f\u5426\u67090-(c+d)，\u5982\u679c\u6709\u5c31\u5728\u603b\u7684count\u4e0a\u52a0\u4e0a\u5bf9\u5e94\u7684value\u3002<\/p>\n

\u4ee3\u7801：<\/p>\n

class Solution {
\npublic:
\n int fourSumCount(vector<int>& nums1, vector<int>& nums2, vector<int>& nums3, vector<int>& nums4) {
\n unordered_map<int,int>map;
\n for(int a:nums1){
\n for(int b:nums2){
\n map[a+b]++;
\n }
\n }
\n int count=0;
\n for(int c:nums3){
\n for(int d:nums4){
\n if(map.find(0-(c+d))!=map.end()){
\n count+=map[0-(c+d)];
\n }
\n }
\n }
\n return count;
\n }
\n}; <\/p>\n

LeetCode383. \u8d4e\u91d1\u4fe1<\/h2>\n

\u9898\u76ee\u94fe\u63a5：383. \u8d4e\u91d1\u4fe1 – \u529b\u6263（LeetCode） \u6587\u7ae0\u8bb2\u89e3：\u4ee3\u7801\u968f\u60f3\u5f55<\/p>\n

\u601d\u8def：\u8fd9\u9053\u9898\u7528\u54c8\u5e0c\u8868\u7684\u601d\u8def\u89e3\u51b3\u5f88\u7b80\u5355，\u53ea\u9700\u8981\u7528\u4e00\u4e2a26\u4e2a\u5927\u5c0f\u7684\u6570\u7ec4\u6765\u5b58\u50a8，\u7136\u540e\u628amagazine\u7684\u6240\u6709\u5b57\u6bcd\u5b58\u5165\u8fd9\u4e2a\u6570\u7ec4，\u7136\u540e\u518d\u904d\u5386ransomNote，\u6bcf\u904d\u5386\u4e00\u4e2a\u5b57\u6bcd\u5c31\u5728\u6570\u7ec4\u4e2d\u8be5\u6570\u7ec4\u5b57\u6bcd\u7684\u5bf9\u5e94\u6b21\u6570\u51cf\u4e00，\u5982\u679c\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d，\u53d1\u73b0\u6570\u7ec4\u4e2d\u67d0\u4e00\u9879\u4e3a\u8d1f\u6570\u4e86，\u5c31return false，\u5982\u679c\u4e00\u76f4\u6b63\u5e38\u904d\u5386\u5c31return true\u3002<\/p>\n

\u4ee3\u7801：<\/p>\n

class Solution {
\npublic:
\n bool canConstruct(string ransomNote, string magazine) {
\n vector<int>vec(26);
\n if(ransomNote.size()>magazine.size()){
\n return false;
\n }
\n for(int i=0;i<magazine.size();i++){
\n vec[magazine[i]-'a']++;
\n }
\n for(int i=0;i<ransomNote.size();i++){
\n vec[ransomNote[i]-'a']–;
\n if(vec[ransomNote[i]-'a']<0){
\n return false;
\n }
\n }
\n return true;
\n }
\n}; <\/p>\n

LeetCode15. \u4e09\u6570\u4e4b\u548c<\/h2>\n

\u9898\u76ee\u94fe\u63a5：15. \u4e09\u6570\u4e4b\u548c – \u529b\u6263（LeetCode） \u6587\u7ae0\u8bb2\u89e3：\u4ee3\u7801\u968f\u60f3\u5f55 \u89c6\u9891\u8bb2\u89e3：\u68a6\u7834\u788e\u7684\u5730\u65b9！| LeetCode：15.\u4e09\u6570\u4e4b\u548c_\u54d4\u54e9\u54d4\u54e9_bilibili<\/p>\n

\u601d\u8def：\u8fd9\u662f\u4e00\u9053\u6bd4\u8f83\u590d\u6742\u7684\u9898，\u7528\u54c8\u5e0c\u8868\u4f1a\u5f88\u9ebb\u70e6\u3002\u7528\u53cc\u6307\u9488\u4f1a\u7b80\u4fbf\u4e00\u4e9b，\u5927\u4f53\u7684\u601d\u8def\u662f\u5148\u786e\u5b9a\u7b2c\u4e00\u4e2a\u6570\u7684\u503c，\u7136\u540e\u7b2c\u4e8c\u4e2a\u7b2c\u4e09\u4e2a\u6570\u5206\u522b\u7528\u53cc\u6307\u9488\u5411\u548c\u4e3a0\u9760\u62e2\u3002\u8fd9\u4e2a\u9898\u6700\u9ebb\u70e6\u7684\u70b9\u662f\u53bb\u91cd，\u6211\u7684\u60f3\u6cd5\u662f\u7b2c\u4e00\u4e2a\u503c\u7528\u6700\u5de6\u8fb9\u7684\u503c，\u5982\u679c\u540e\u7eed\u9047\u5230\u7684\u503c\u548c\u5de6\u8fb9\u7684\u4e00\u6837\u5c31\u8df3\u8fc7，\u7b2c\u4e8c\u4e2a\u548c\u7b2c\u4e09\u4e2a\u53cd\u800c\u662f\u8981\u63a5\u8fd1\u4e2d\u95f4\u7684\u503c（\u5176\u5b9e\u6211\u89c9\u5f97\u8fd9\u91cc\u7528\u66f4\u9760\u8fb9\u7684\u503c\u4e5f\u6ca1\u6709\u95ee\u9898）\u00a0\u3002<\/p>\n

\u4ee3\u7801：<\/p>\n

class Solution {
\npublic:
\n vector<vector<int>> threeSum(vector<int>& nums) {
\n vector<vector<int>>result;
\n sort(nums.begin(),nums.end());
\n for(int i=0;i<nums.size();i++){
\n \/\/\u9996\u5148\u5bf9\u7b2c\u4e00\u4e2a\u6570\u53bb\u91cd，\u5982\u679c\u91cd\u590d\u4e86\u5c31\u8df3\u8fc7
\n if(i>0&&nums[i]==nums[i-1]){
\n continue;
\n }
\n int left=i+1;
\n int right=nums.size()-1;
\n while(left<right){
\n if(nums[i]+nums[left]+nums[right]<0){
\n left++;
\n }
\n else if(nums[i]+nums[left]+nums[right]>0){
\n right–;
\n }
\n else{
\n \/\/\u7b2c\u4e8c\u4e2a\u6570\u7684\u53bb\u91cd，\u5982\u679c\u662f\u76f8\u540c\u503c\u6211\u4eec\u53ea\u8981\u6700\u53f3\u8fb9\u7684\u90a3\u4e2a
\n while(left<right&&nums[left]==nums[left+1]){
\n left++;
\n }
\n \/\/\u7b2c\u4e09\u4e2a\u6570\u7684\u53bb\u91cd，\u5982\u679c\u662f\u76f8\u540c\u503c\u6211\u4eec\u53ea\u8981\u6700\u5de6\u8fb9\u7684\u90a3\u4e2a
\n while(left<right&&nums[right]==nums[right-1]){
\n right–;
\n }
\n result.push_back(vector<int>{nums[i],nums[left],nums[right]});
\n left++;
\n right–;
\n }
\n }
\n }
\n return result;
\n }
\n}; <\/p>\n

LeetCode18. \u56db\u6570\u4e4b\u548c<\/h2>\n

\u9898\u76ee\u94fe\u63a5：18. \u56db\u6570\u4e4b\u548c – \u529b\u6263（LeetCode） \u6587\u7ae0\u8bb2\u89e3：\u4ee3\u7801\u968f\u60f3\u5f55 \u89c6\u9891\u8bb2\u89e3：\u96be\u5728\u53bb\u91cd\u548c\u526a\u679d！| LeetCode：18. \u56db\u6570\u4e4b\u548c_\u54d4\u54e9\u54d4\u54e9_bilibili<\/p>\n

\u601d\u8def：\u5176\u5b9e\u548c\u4e09\u6570\u4e4b\u548c\u57fa\u672c\u4e00\u6837，\u53ea\u4e0d\u8fc7\u5916\u9762\u53c8\u5957\u4e86\u4e00\u5c42\u5faa\u73af，\u7136\u540e\u6b64\u5916，\u5728\u548ctarget\u6bd4\u5927\u5c0f\u7684\u65f6\u5019\u7531\u4e8enums\u6570\u7ec4\u4e2d\u7684\u503c\u592a\u5927，\u9700\u8981\u8f6c\u5316\u4e3along\u7c7b\u578b，\u522b\u7684\u5c31\u6ca1\u6709\u533a\u522b\u4e86\u3002<\/p>\n

\u4ee3\u7801：<\/p>\n

class Solution {
\npublic:
\n vector<vector<int>> fourSum(vector<int>& nums, int target) {
\n vector<vector<int>>result;
\n sort(nums.begin(),nums.end());
\n for(int i=0;i<nums.size();i++){
\n if(i>0&&nums[i]==nums[i-1]){
\n continue;
\n }
\n for(int k=i+1;k<nums.size();k++){
\n if(k>i+1&&nums[k]==nums[k-1]){
\n continue;
\n }
\n int left=k+1;
\n int right=nums.size()-1;
\n while(left<right){
\n if((long)nums[i]+nums[k]+nums[left]+nums[right]<target){
\n left++;
\n }
\n else if((long)nums[i]+nums[k]+nums[left]+nums[right]>target){
\n right–;
\n }
\n else{
\n while (right > left && nums[left] == nums[left + 1]){
\n left++;
\n }
\n while (right > left && nums[right] == nums[right – 1]){
\n right–;
\n }
\n result.push_back(vector<int>{nums[i],nums[k],nums[left],nums[right]});
\n left++;
\n right–;
\n }
\n }
\n }
\n }
\n return result;
\n }
\n};<\/p>\n","protected":false},"excerpt":{"rendered":"

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