\u9898\u76ee\u94fe\u63a5：93. \u590d\u539f IP \u5730\u5740 – \u529b\u6263（LeetCode） \u6587\u7ae0\u8bb2\u89e3：\u4ee3\u7801\u968f\u60f3\u5f55 \u89c6\u9891\u8bb2\u89e3：\u56de\u6eaf\u7b97\u6cd5\u5982\u4f55\u5206\u5272\u5b57\u7b26\u4e32\u5e76\u5224\u65ad\u662f\u5408\u6cd5IP？| LeetCode：93.\u590d\u539fIP\u5730\u5740_\u54d4\u54e9\u54d4\u54e9_bilibili<\/p>\n
\u601d\u8def：\u8fd9\u9053\u9898\u548c\u4e0a\u4e00\u9898\u5f88\u50cf，\u5927\u4f53\u601d\u8def\u662f\u4e00\u81f4\u7684，\u53ea\u4e0d\u8fc7\u7ec8\u6b62\u6761\u4ef6\u662f\u6709\u4e09\u4e2a'.'\u5c31\u4f1a\u7ec8\u6b62\u3002\u6240\u4ee5\u6211\u4eec\u4e13\u95e8\u8bbe\u5b9a\u4e86\u4e00\u4e2apointsum\u7528\u4e8e\u8bb0\u5f55\u6240\u6709\u7684'.'\u7684\u4e2a\u6570，\u5728\u4e4b\u540e\u6ca1\u5207\u4e00\u6bb5\u5c31\u52a0\u4e00，\u76f4\u5230\u4e09\u5c31\u7ec8\u6b62，\u7136\u540e\u5728for\u5faa\u73af\u7684\u903b\u8f91\u4e2d\u9700\u8981\u7528\u5b57\u7b26\u4e32\u7684insert\u51fd\u6570\u52a0\u5165'.'，\u518dpointsum++，\u7136\u540e\u518d\u9012\u5f52\u7684\u65f6\u5019\u9700\u8981\u6ce8\u610f\u4e0d\u518d\u662fi+1\u800c\u662fi+2\u56e0\u4e3a\u591a\u52a0\u5165\u4e86\u4e00\u4e2a'.'\u3002\u7136\u540eisValid()\u51fd\u6570，\u9700\u8981\u5224\u65ad\u6bcf\u4e2a\u5c0f\u5b57\u7b26\u4e32\u662f\u5426\u5408\u7406，\u4e3b\u8981\u662f\u5224\u65ad\u4e00\u4e0b\u5c0f\u4e32\u5f00\u5934\u662f\u5426\u4e3a0，\u662f\u5426\u6709\u4e0d\u57280-9\u8303\u56f4\u5185\u7684\u5b57\u7b26，\u4ee5\u53ca\u6570\u5b57\u662f\u5426\u5927\u4e8e255\u3002<\/p>\n
\u4ee3\u7801：<\/p>\n
class Solution {
\npublic:
\n vector<string>result;
\n void backtracking(string& s,int startindex,int pointsum){
\n if(pointsum==3){
\n if(isValid(s,startindex,s.size()-1)){
\n result.push_back(s);
\n }
\n }
\n for(int i=startindex;i<s.size();i++){
\n if(isValid(s,startindex,i)){
\n s.insert(s.begin()+i+1,'.');
\n pointsum+=1;
\n backtracking(s,i+2,pointsum);
\n s.erase(s.begin()+i+1);
\n pointsum-=1;
\n }
\n else{
\n break;
\n }
\n }
\n }
\n bool isValid(string& s,int start,int end){
\n if(start>end){
\n return false;
\n }
\n if(s[start]=='0'&&start!=end){
\n return false;
\n }
\n int num=0;
\n for(int i=start;i<=end;i++){
\n if(s[i]>'9'||s[i]<'0'){
\n return false;
\n }
\n num=num*10+(s[i]-'0');
\n if(num>255){
\n return false;
\n }
\n }
\n return true;
\n }
\n vector<string> restoreIpAddresses(string s) {
\n backtracking(s,0,0);
\n return result;
\n }
\n}; <\/p>\n
\u9898\u76ee\u94fe\u63a5：78. \u5b50\u96c6 – \u529b\u6263（LeetCode） \u6587\u7ae0\u8bb2\u89e3：\u4ee3\u7801\u968f\u60f3\u5f55 \u89c6\u9891\u8bb2\u89e3：\u56de\u6eaf\u7b97\u6cd5\u5982\u4f55\u5206\u5272\u5b57\u7b26\u4e32\u5e76\u5224\u65ad\u662f\u5408\u6cd5IP？| LeetCode：93.\u590d\u539fIP\u5730\u5740_\u54d4\u54e9\u54d4\u54e9_bilibili<\/p>\n
\u601d\u8def：\u548c\u4e4b\u524d\u7ec4\u5408\u7684\u9898\u76ee\u5f88\u50cf，\u53ea\u4e0d\u8fc7\u5c06path\u4fdd\u5b58\u5230\u7ed3\u679c\u4e2d\u7684\u6307\u4ee4\u7684\u4f4d\u7f6e\u53d8\u4e86，\u4e0d\u5728\u7ec8\u6b62\u6761\u4ef6\u91cc，\u800c\u662f\u5728\u6bcf\u6b21\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u7684\u65f6\u5019\u90fd\u4fdd\u5b58\u4e00\u6b21\u3002\u5982\u679c\u5728\u6811\u4e2d\u4f53\u73b0\u5c31\u662f\u4e4b\u524d\u662f\u53ea\u6709\u53f6\u5b50\u8282\u70b9\u624d\u4fdd\u5b58\u7ed3\u679c，\u73b0\u5728\u662f\u6bcf\u4e2a\u8282\u70b9\u90fd\u4f1a\u4fdd\u5b58\u3002<\/p>\n
\u4ee3\u7801：<\/p>\n
class Solution {
\npublic:
\n vector<vector<int>>result;
\n vector<int>path;
\n void backtracking(vector<int>& nums,int startindex){
\n result.push_back(path);
\n if(startindex>=nums.size()){
\n return;
\n }
\n for(int i=startindex;i<nums.size();i++){
\n path.push_back(nums[i]);
\n backtracking(nums,i+1);
\n path.pop_back();
\n }
\n }
\n vector<vector<int>> subsets(vector<int>& nums) {
\n backtracking(nums,0);
\n return result;
\n }
\n}; <\/p>\n
\u9898\u76ee\u94fe\u63a5：90. \u5b50\u96c6 II – \u529b\u6263（LeetCode） \u6587\u7ae0\u8bb2\u89e3：\u4ee3\u7801\u968f\u60f3\u5f55 \u89c6\u9891\u8bb2\u89e3：\u56de\u6eaf\u7b97\u6cd5\u89e3\u51b3\u5b50\u96c6\u95ee\u9898，\u5982\u4f55\u53bb\u91cd？| LeetCode：90.\u5b50\u96c6II_\u54d4\u54e9\u54d4\u54e9_bilibili<\/p>\n
\u601d\u8def：\u8fd9\u9053\u9898\u6ca1\u4ec0\u4e48\u597d\u8bf4\u7684，\u4e3b\u8981\u8fd8\u662f\u53bb\u91cd，\u5176\u4e2d\u53bb\u91cd\u7684\u6b65\u9aa4\u548c40.\u7ec4\u5408\u603b\u548cII\u662f\u4e00\u6a21\u4e00\u6837\u7684\u3002<\/p>\n
\u4ee3\u7801：<\/p>\n
class Solution {
\npublic:
\n vector<int>path;
\n vector<vector<int>>result;
\n void backtracking(vector<int>& nums,int startindex,vector<bool>& used){
\n result.push_back(path);
\n if(startindex>=nums.size()){
\n return;
\n }
\n for(int i=startindex;i<nums.size();i++){
\n if(i>0&&nums[i]==nums[i-1]&&used[i-1]==false){
\n continue;
\n }
\n path.push_back(nums[i]);
\n used[i]=true;
\n backtracking(nums,i+1,used);
\n used[i]=false;
\n path.pop_back();
\n }
\n }
\n vector<vector<int>> subsetsWithDup(vector<int>& nums) {
\n vector<bool>used(nums.size(),false);
\n sort(nums.begin(),nums.end());
\n backtracking(nums,0,used);
\n return result;
\n }
\n};<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb74\u6b21\u3002\u601d\u8def\uff1a\u8fd9\u9053\u9898\u548c\u4e0a\u4e00\u9898\u5f88\u50cf\uff0c\u5927\u4f53\u601d\u8def\u662f\u4e00\u81f4\u7684\uff0c\u53ea\u4e0d\u8fc7\u7ec8\u6b62\u6761\u4ef6\u662f\u6709\u4e09\u4e2a\\’.\\’\u5c31\u4f1a\u7ec8\u6b62\u3002\u6240\u4ee5\u6211\u4eec\u4e13\u95e8\u8bbe\u5b9a\u4e86\u4e00\u4e2apointsum\u7528\u4e8e\u8bb0\u5f55\u6240\u6709\u7684\\’.\\’\u7684\u4e2a\u6570\uff0c\u5728\u4e4b\u540e\u6ca1\u5207\u4e00\u6bb5\u5c31\u52a0\u4e00\uff0c\u76f4\u5230\u4e09\u5c31\u7ec8\u6b62\uff0c\u7136\u540e\u5728for\u5faa\u73af\u7684\u903b\u8f91\u4e2d\u9700\u8981\u7528\u5b57\u7b26\u4e32\u7684insert\u51fd\u6570\u52a0\u5165\\’.\\’\uff0c\u518dpointsum++\uff0c\u7136\u540e\u518d\u9012\u5f52\u7684\u65f6\u5019\u9700\u8981\u6ce8\u610f\u4e0d\u518d\u662fi+1\u800c\u662fi+2\u56e0\u4e3a\u591a\u52a0\u5165\u4e86\u4e00\u4e2a\\’.\\’\u3002\u7136\u540eisValid()\u51fd\u6570\uff0c\u9700\u8981\u5224\u65ad\u6bcf\u4e2a\u5c0f\u5b57\u7b26\u4e32\u662f\u5426\u5408\u7406\uff0c\u4e3b\u8981\u662f\u5224\u65ad\u4e00\u4e0b\u5c0f\u4e32\u5f00\u5934\u662f\u5426\u4e3a0\uff0c\u662f\u5426\u6709\u4e0d\u57280-9\u8303\u56f4\u5185\u7684\u5b57\u7b26\uff0c\u4ee5\u53ca\u6570\u5b57\u662f\u5426\u5927\u4e8e255\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[427],"topic":[],"class_list":["post-58050","post","type-post","status-publish","format-standard","hentry","category-server","tag-427"],"yoast_head":"\n