LeetCode-Unique Paths

LeetCode-Unique Paths

A robot is located at the top-left corner of a m x n grid (marked 'start' in the dimo-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 dimo-below ).

How many possible unique paths are there?

Above is a 3x7 grid. How many possible unique paths are there?

Niao I was very famous for its wide selection of large numbers of Chinese characters. €? /P>

Why don't you see them? Why? why are there some problems? /P>

 

class Solution {public:   int uniquePaths(int m, int n)  {        int temp[m][n];        for (size_t i = 0; i != m; i++)            for(size_t j = 0; j != n; j++)            temp[i][j] = -1;        temp[0][0] = 1;        for (size_t i = 0; i != m; i++) {            for(size_t j = 0; j != n; j++) {              if(j != n-1) {                if(temp[i][j+1] != -1)                   temp[i][j+1] += temp[i][j];                else                    temp[i][j+1] = temp[i][j];              }              if(i != m-1) {                if(temp[i+1][j] != -1)                    temp[i+1][j] += temp[i][j];                else                    temp[i+1][j] = temp[i][j] ;              }            }         }         return temp[m-1][n-1];    }};

 

Note: m and n will be at most 100.