题目描述
输入一个矩阵,按照从外向里以顺时针的顺序依次打印出每一个数字,例如,如果输入如下矩阵: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 则依次打印出数字1,2,3,4,8,12,16,15,14,13,9,5,6,7,11,10.
import java.util.ArrayList;
public class Solution {
public ArrayList<Integer> printMatrix(int[][] matrix) {
int row = matrix.length - 1;
int column = matrix[0].length - 1;
int i = 0, j = 0;
ArrayList<Integer> array = new ArrayList<Integer>();
while(i <= row && j <= column) {
for(int k = j; k <= column; k++)
array.add(matrix[i][k]);
for(int k = i + 1; k <= row; k ++)
array.add(matrix[k][column]);
for(int k = column - 1; k >= j&& i!=row; k --)
array.add(matrix[row][k]);
for(int k = row - 1; k >= i + 1&&j!= column; k --)
array.add(matrix[k][j]);
i++;
j++;
row --;
column --;
}
return array;
}
public static void main(String[] args) {
int[][] matrix = {{1},{2},{3},{4}};
Solution obj = new Solution();
ArrayList<Integer> array = obj.printMatrix(matrix);
for(int i : array){
System.out.println(i);
}
}
}