Leetcode 59. Spiral Matrix II

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public class Solution {    public int[][] generateMatrix(int n) {        int[][] res = new int[n][n];        int up = 0, right = n-1, down = n-1, left = 0, elem = 1;                while (true) {            for (int col=left; col<=right; col++) res[up][col] = elem++;            if (++up > down) break;                        for (int row=up; row<=down; row++) res[row][right] = elem++;            if (--right < left) break;                        for (int col=right; col>=left; col--) res[down][col] = elem++;            if (--down < up) break;                        for (int row=down; row>=up; row--) res[row][left] = elem++;            if (++left > right) break;        }                return res;    }}

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[LeetCode]59.Spiral Matrix II
LeetCode --- 59. Spiral Matrix II
[Leetcode] 59. Spiral Matrix II
[leetcode] 59.Spiral Matrix II
LeetCode 59. Spiral Matrix II
59. Spiral Matrix II LeetCode
[leetcode] 59. Spiral Matrix II
leetcode 59. Spiral Matrix II
LeetCode 59. Spiral Matrix II
leetcode 59. Spiral Matrix II
LeetCode *** 59. Spiral Matrix II
leetcode 59. Spiral Matrix II
Leetcode 59. Spiral Matrix II
LeetCode 59. Spiral Matrix II
LeetCode - 59. Spiral Matrix II
[LeetCode] 59. Spiral Matrix II
[leetcode] 59. Spiral Matrix II
[leetcode]59. Spiral Matrix II
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