二維數組的建立

#include <iostream>
#include <vector>
using namespace std;
int main()
{  
int m ,n;
cin>>m>>n;
vector<vector<int> > array;
array.resize(m);
for(int i = 0; i != m; i++)
 {
    array[i].resize(n);
    for (int j =0; j != n; j++)
    {
     array[i][j] = i * j;
    }
 }
for(int i = 0; i != m; i++)
  {
    for (int j =0; j != n; j++)
     {
       cout<<array[i][j]<<" ";
     }
   cout<<endl;
  }
return 0;
}

#include <iostream>
#include <vector>
using namespace std;
int main()
{  
int m ,n;
cin>>m>>n;
//更簡單的形式
vector<vector<int> > array(m, vector<int>(n));  //默認有m*n個數都初始化爲0
for(int i = 0; i != m; i++)
 {
    for (int j =0; j != n; j++)
    {
     array[i][j] = i * j;
    }
 }
for(int i = 0; i != m; i++)
  {
    for (int j =0; j != n; j++)
     {
       cout<<array[i][j]<<" ";
     }
   cout<<endl;
  }
return 0;
}