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题目描述:
- 给定一个正整数 n,生成一个包含 1 到 n2 所有元素,且元素按顺时针顺序螺旋排列的正方形矩阵。
- 示例:
- 输入: 3
- 输出:
- [
- [ 1, 2, 3 ],
- [ 8, 9, 4 ],
- [ 7, 6, 5 ]
- ]
- 来源:力扣(LeetCode)
- 链接:https://leetcode-cn.com/problems/spiral-matrix-ii
- 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
复制代码
- class Solution {
- public:
- vector<vector<int>> generateMatrix(int n) {
- vector<vector<int> > res(n, vector<int>(n, 0));
- int left = 0, right = n-1;
- int up = 0, down = n-1;
- int number = 1;
- while(left <= right && up <= down){
- for(int i = left; i <= right; i++){
- res[up][i] = number++;
- }
- up++;
- if(up > down) break;
- for(int i = up; i <= down; i++){
- res[i][right] = number++;
- }
- right--;
- if(left > right) break;
- for(int i = right; i >= left; i--){
- res[down][i] = number++;
- }
- down --;
- if(up > down) break;
- for(int i = down; i >= up; i--){
- res[i][left] = number++;
- }
- left++;
- if(left > right) break;
- }
- return res;
- }
- };
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