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int n; cin>>n;
// 开辟空间
int **p = (int **)new int[sizeof(int)*n];
for (int i = 0; i != n; ++i)
{
p[i] = new int [n];
}
// 释放空间
for (int i = 0; i != n; ++i)
{
delete []p[i] ;
}
delete []p;