description:

螺旋型填充矩陣
Note:

Example:

Example:Input: 3 Output: [[ 1, 2, 3 ],[ 8, 9, 4 ],[ 7, 6, 5 ] ]

answer:

class Solution { public:vector<vector<int>> generateMatrix(int n) {vector<vector<int>> res(n, vector<int>(n, 0));int up = 0, down = n - 1, right = n - 1, left = 0, val = 1;while(true) {for (int j = left; j <= right; ++j) res[up][j] = val++;if (++up > down) break;for (int i = up; i <= down; ++i) res[i][right] = val++;if (--right < left) break;for (int j = right; j >= left; --j) res[down][j] = val++;if (--down < up) break;for (int i = down; i >= up; --i) res[i][left] = val++;if (++left > right) break;}return res;} };

relative point get√：

hint :

轉載于:https://www.cnblogs.com/forPrometheus-jun/p/11296416.html

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