62. Unique Paths
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A robot is located at the top-left corner of a m x n grid (marked ‘Start’ in the diagram below).
The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked ‘Finish’ in the diagram below).
How many possible unique paths are there?
Above is a 3 x 7 grid. How many possible unique paths are there?
Note: m and n will be at most 100.
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Hide Tags Array Dynamic Programming
Hide Similar Problems (M) Unique Paths II (M) Minimum Path Sum (H) Dungeon Game
解题思路:这是一道非常经典的动态规划的题目,根据前面的结果得到后面的结果。
public class Solution { public int uniquePaths(int m, int n) { if(m <= 1||n <=1){ return 1; } int[] res = new int[n]; for(int i = 0; i < n; i++) { res[i] = 1; } for(int i = 1; i < m; i++){ for(int j = 1; j < n; j++){ res[j] += res[j-1]; } } return res[n-1]; }}
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