adyw2565876的博客

vector<vector<int> > combinationSum(vector<int> &candidates, int target) { vector<vector<int>> result; if (&candidates == NULL) { return result; } v

`http://www.lintcode.com/zh-cn/problem/implement-queue-by-two-stacks/ class Queue { public: stack stack1; stack stack2;Queue() {}void push(int element) { stack1.push(element); }int pop(