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?
思路:简单动态规划
class Solution {
public:
int uniquePaths(int m, int n) {
int dp[110][110];
if(m==1 && n==1)
return 1;
for(int i=0;i<m;i++)
for(int j=0;j<n;j++)
{
if(j==0 && i==0)
dp[i][j] = 0;
else if(i == 0)
dp[i][j] = 1;
else if(j == 0)
dp[i][j] = 1;
else
dp[i][j] = dp[i-1][j] + dp[i][j-1];
}
return dp[m-1][n-1];
}
};