59. Spiral Matrix II
和Spiral Matrix是一样的,这题还简单一点
1 public int[][] generateMatrix(int n) { 2 int[][] res = new int[n][n]; 3 if(n <= 0) { 4 return res; 5 } 6 int layer = n / 2; 7 int cnt = 1; 8 for(int i = 0; i < layer; i++) { 9 for(int j = i; j < n-1-i; j++) { 10 res[i][j] = cnt; 11 cnt++; 12 } 13 for(int j = i; j < n-1-i; j++) { 14 res[j][n-1-i] = cnt; 15 cnt++; 16 } 17 for(int j = i; j < n-1-i; j++) { 18 res[n-1-i][n-1-j] = cnt; 19 cnt++; 20 } 21 for(int j = i; j < n-1-i; j++) { 22 res[n-1-j][i] = cnt; 23 cnt++; 24 } 25 } 26 if(n % 2 == 1) { 27 res[layer][layer] = cnt; 28 } 29 return res; 30 }