问题描述:
Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order.
For example,
Given n = 3
,
You should return the following matrix:
[ [ 1, 2, 3 ], [ 8, 9, 4 ], [ 7, 6, 5 ] ]
原问题链接:https://leetcode.com/problems/spiral-matrix-ii/
问题分析
这个问题和前面的Spiral Matrix 基本上差不多,前面是要求按照这种方式遍历整个矩阵,这里是按照这个方式给矩阵里的元素赋值。所以可以在原来的基础上稍微修改一点直接搬过来就可以了。详细的代码实现如下:
public class Solution { public int[][] generateMatrix(int n) { int[][] matrix = new int[n][n]; int rowBegin = 0, rowEnd = n - 1, colBegin = 0, colEnd = n - 1, count = 1; while(rowBegin <= rowEnd && colBegin <= colEnd) { for(int i = colBegin; i <= colEnd; i++) { matrix[rowBegin][i] = count; count++; } rowBegin++; for(int i = rowBegin; i <= rowEnd; i++) { matrix[i][colEnd] = count; count++; } colEnd--; if(rowBegin <= rowEnd) { for(int i = colEnd; i >= colBegin; i--) { matrix[rowEnd][i] = count; count++; } } rowEnd--; if(colBegin <= colEnd) { for(int i = rowEnd; i >= rowBegin; i--) { matrix[i][colBegin] = count; count++; } } colBegin++; } return matrix; } }
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