数据结构-顺时针打印矩阵

题目:输入一个矩阵，按照从外向里以顺时针一次打印出每一个数字，例如矩阵{ {1,2,3,4}, {5,6,7,8}, {9,10,11,12}, {13,14,15,16} }  则打印出： 1 2 3 4 8 12 16 15 14 13 9 5 6 7 11 10

分析：考虑各个边界

/*
剑指offer面试题20
*/
#include <iostream>

using namespace std;

void ClockwiseMatrix(int a[][4],int column,int row,int start){
    int endx = column - 1 - start;
    int endy = row - 1 - start;

    for(int i=start;i<=endx;++i){
        int number = a[start][i];
        cout << number << " " << flush;
    }

    if(start < endy){
        for(int i=start+1;i<=endy;i++){
            int number = a[i][endy];
            cout << number << " " << flush;
        }
    }

    if(start < endx && start < endy){
        for(int i=endx-1;i>=start;i--){
            int number = a[endy][i];
            cout << number << " " << flush;
        }
    }

    if(start < endx && start < endy-1){
        for(int i=endy-1;i>=start+1;i--){
            int number = a[i][start];
            cout << number << " " << flush;
        }
    }
}

void ClockwiseMatrix(int a[][4],int column,int row){
    if(column <= 0 || row <=0){
        return ;
    }

    int start = 0;

    while(column > start*2 && row > start * 2){
        ClockwiseMatrix(a,column,row,start);
        ++start;
    }
}

int main()
{
    int a[4][4] = {
        {1,2,3,4},
        {5,6,7,8},
        {9,10,11,12},
        {13,14,15,16}
    };
    int row = 4;
    int column = 4;

    ClockwiseMatrix(a,column,row);
    return 0;
}