Day24 回溯法4 | LeetCode 93. 复原 IP 地址, 78. 子集, 90. 子集 II
LeetCode93.复原IP地址classSolution{public:vectorresult;voidbackTracking(string&s,intstartIndex,intpoingNum){if(poingNum==3){if(isValid(s,startIndex,s.size()-1)){result.push_back(s);}return;}for(inti=start