# 顺时针从外往里打印数字

## 顺时针从外往里打印数字

#### 参考链接 https://mp.weixin.qq.com/s/nzUTmCuIaSgtpag5S1RQ3w


/**
* @author lin
* @date 18/7/27
*/

public class demo {

public void print(int a[][]) {
int realRow = a.length;
int row = realRow / 2;
if ((realRow&1) == 1) {
row = row + 1;
}
for (int r = 0, c = 0; r < row; r ++, c++) {
int col = a[r].length;
int dr = r;
int dc = c;
while (dc < c + col - c * 2) {
System.out.print(a[dr][dc] + " ");
dc ++;
}
dc --;
dr ++;
while (dr < r + realRow - r * 2) {
System.out.print(a[dr][dc] + " ");
dr ++;
}
dr --;
dc --;
while (dc >= c) {
System.out.print(a[dr][dc] + " ");
dc --;
}
dc ++;
dr --;
while (dr > r) {
System.out.print(a[dr][dc] + " ");
dr --;
}
}
}

public static void main(String[] args) {

//        int arr[][] = {
//                {1,2,3,4,5},
//                {14,15,16,17,6},
//                {13,20,19,18,7},
//                {12,11,10,9,8}
//        };

int arr[][] = {
{1,  2,  3,  4,  5},
{16, 17, 18, 19, 6},
{15, 24, 25, 20, 7},
{14, 23, 22, 21, 8},
{13, 12, 11, 10, 9}
};

demo d = new demo();
d.print(arr);
}

}


        int arr[][] = {
{1,  2,  3,  4,  5},
{16, 17, 18, 19, 6},
{15, 24, 25, 20, 7},
{14, 23, 22, 21, 8},
{13, 12, 11, 10, 9}
};


0 [0, 1, 2, 3, 4]
1 [0,          , 4]
2 [0,         , 4]
3 [0,         , 4]
4 [0, 1, 2, 3, 4]

0 [                ]
1 [ , 1, 2, 3,     ]
2 [, 1, 2, 3      ]
3 [, 1, 2, 3     ]
4 [               ]


#### 这恐怕是最挫的一种写法了

posted @ 2018-07-27 12:51  戴杭林  阅读(95)  评论(0编辑  收藏