C++ 嵌套 vector 初始化

注：C++11 支持，g++ test.cpp -std=c++11

#include<iostream>
#include<string>
#include<vector>
using namespace std;


int main() {

    vector<vector<int> > board1 (10, vector<int>(10, 0));
    int m = board1.size();
    int n = board1[0].size();
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            cout<< board1[i][j]<<" ";
        }
        cout<<endl;
    }

    vector<vector<char> > board2 = {{'X','.','.','X'}, {'.','.','X','X'}, {'X','X','.','.'}};
    m = board2.size();
    n = board2[0].size();
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            cout<< board2[i][j]<<" ";
        }
        cout<<endl;
    }
}