逆转矩阵

#include "stdafx.h"
#include <iostream>
#include <vector>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    vector<vector<int>>a(4, vector < int>(3));
    int v = 1;
    //初始化一个矩阵。
    for (int i = 0; i < a.size(); i++){
        for (int j = 0; j < a[0].size(); j++){
            a[i][j] = v++;
        }
    }
    vector<vector<int>>b =a;
    //使用b保存矩阵a
    for (int i = 0; i < b.size(); i++){
        for (int j = 0; j < b[0].size(); j++){
            cout << b[i][j] << "  "; 
        }
        cout << endl;
    }
    
    //初始化矩阵的空间
    a.clear();
    a.resize(b[0].size());

    for (int i = 0; i < a.size(); i++){
        a[i].resize(b.size());
    }
    //制作逆时针转向的新矩阵
    for (int i = 0; i < b[0].size(); i++){
        for (int j = 0; j < b.size(); j++){
            //a[i][j]=b[j][i];
            a[b[0].size() - i - 1][j] = b[j][i];
        }
    }
    //打印逆转矩阵的值
    for (int i = 0; i < a.size(); i++){
        for (int j = 0; j < a[0].size(); j++){
            cout << a[i][j] << "  ";
        }
        cout << endl;
    }
    return 0;
}