62. Unique Paths （DP） 

 1 class Solution {
 2     public int uniquePaths(int m, int n) {
 3         int[][] res = new int[m][n];
 4         if(m == 0 || n == 0) return 0;
 5         res[0][0] = 1;
 6         for(int i = 0; i < m; i++) {
 7             for(int j = 0; j < n; j++) {
 8                 if(i == 0 && j ==0) continue;
 9                 if(i - 1 < 0) {
10                     res[i][j] = res[i][j - 1];
11                 }else if(j - 1 < 0) {
12                     res[i][j] = res[i - 1][j];
13                 }else {
14                     res[i][j] = res[i - 1][j] + res[i][j - 1];
15                 }
16                 
17             }
18         }
19         return res[m - 1][n - 1];
20     }
21 }

没啥特别的

posted @ 2018-08-16 10:20  jasoncool1  阅读(129)  评论(0)    收藏  举报