1.動態開闢二維數組
int n, m;//動態開闢n行m列的二維數組
cin >> n >> m;
int** p = new int*[n];//開闢n行
for (int i = 0; i < n; i++)
p[i] = new int[m];//開闢m列
for (int i = 0; i < n; i++)
delete[] p[i];//銷燬空間
int n, m;//動態開闢n行m列的二維數組
cin >> n >> m;
int** p = new int*[n];//開闢n行
for (int i = 0; i < n; i++)
p[i] = new int[m];//開闢m列
for (int i = 0; i < n; i++)
delete[] p[i];//銷燬空間