1.自己定义的结构体sizeof还是要加括号
BSTNode *t=(BSTNode*)malloc(sizeof(BSTNode));
// BSTNode *t=(BSTNode*)malloc(sizeof BSTNode);
2.C++[Error] '__comp' cannot be used as a function
dp[i][j]=min(dp[i-1][j]+1,dp[i][j-1]+1,dp[i-1][j-1]+1);//这个不对 min两个参数
dp[i][j]=min(dp[i-1][j]+1,min(dp[i][j-1]+1,dp[i-1][j-1]+1));