思路依次枚举每个空位的1-9,如果有重复则换一个数字,没重复继续下一个位置。class Solution {public: bool isValid(int row,int col,char t,vector<vector<char>>& board){
class Solution {public: uint32_t reverseBits(uint32_t n) { uint32_t ans=1; for(int i=1;i<=32;i++){ ans=(ans<<1)+(