feng_xinlei的博客

1 如果是直接声明 string s=""；后面不能像给char 数组赋值一样赋值，必须用+连接添加，eg：s=s+"2"; eg:leetcode 66 2 越界问题  eg:leetcode 69 int mySqrt(int x) {         int i = 1;         while(i*i<=x&&i!=46340)i++;//若i=46341，...

题目 Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock...

大数的时候可以想按位与的方法，就像190题，翻转，n&1是取出最后一个数 uint32_t reverseBits(uint32_t n) { uint32_t ret = 0; int i=0; while(i<32) { ret=(ret << 1)+(n & 1); ...