Spiral Matrix II

最新推荐文章于 2025-01-09 18:09:55 发布

mars2014jia

最新推荐文章于 2025-01-09 18:09:55 发布

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public class Solution {
    public int[][] generateMatrix(int n) { // 模仿代码https://leetcodenotes.wordpress.com/2013/11/23/leetcode-spiral-matrix-%E6%8A%8A%E4%B8%80%E4%B8%AA2d-matrix%E7%94%A8%E8%9E%BA%E6%97%8B%E6%96%B9%E5%BC%8F%E6%89%93%E5%8D%B0/
        int[][] res = new int[n][n];
        if(n==0) return res;
        
        int left=0, right = n-1, top = 0, bottom = n-1;
        int k=1;
        while(left<right && top< bottom){
             for(int i=left; i< right; i++){
                 res[top][i] = k++;
             }
              for(int j=top;j<bottom; j++){
                    res[j][right]=k++;  
              }
              for(int x = right; x>left; x--){
                  res[bottom][x]=k++;
              }
              for(int y = bottom; y>top; y--){
                res[y][left]=k++;
            }
            left++;
            right--;
            bottom--;
            top++;
        }
        if(n%2==1) res[n/2][n/2] = k;
        return res;
    }
}