转： http://blog.csdn.net/Touch_Dream/article/details/74931891
#include<stdio.h> #include <iostream> #include <vector> using namespace std; int main() { int row, column; cin >> row >> column; vector<vector<int> > a(row, vector<int>(column)); //row决定最里面层容器大小，vector<int>(column)决定外层容器的类型和大小 for (int j = 0; j < row; j++) for (int k = 0; k< column; k++) a[j][k] = rand() % 100; for (int j = 0; j < row; j++) { cout << endl; for (int k = 0; k< column; k++) { a[j][k] = rand() % 100; cout << a[j][k] << " "; } } while (1) { } return 0; }方法二
利用vector的成员函数resize，来制定大小
#include<stdio.h> #include <iostream> #include <vector> using namespace std; int main() { int row, column; cin >> row ; vector<vector<int> > a(row);//row决定最里面层容器大小，vector<int>(column)决定外层容器的类型和大小 for (int k = 0; k < row; k++) a[k].resize(row);//row*row矩阵 //使用空间 for (int j = 0; j < row; j++) for (int k = 0; k< row; k++) a[j][k] = rand() % 100; for (int j = 0; j < row; j++) { cout << endl; for (int k = 0; k< row; k++) { a[j][k] = rand() % 100; cout << a[j][k] << " "; } } while (1) { } return 0; }测试结果
