c++数组初始化

int * a = new int[2]; 
int * b = new int[2](); // 值初始化，必须是空括号
int * c = new int[2]{2,1}; // C++11，列表初始化
...
// 当然，最后不要忘了
delete [] a;
a = NULL;

int ** d = new int*[m]; 
for(int i = 0; i < m; ++i) {
    d[i] = new int[n];
} 
... 
for(int i = 0; i < m; i++)
    delete [] d[i]; 
delete [] d;