class Solution {
public:
int uniquePaths(int m, int n) {
int dp[n+1][m+1];
memset(dp,0,sizeof(dp));
for(int i=0;i<=m;i++) dp[1][i] = 1;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
dp[i][j] = dp[i-1][j] + dp[i][j-1];
}
}
return dp[n][m];
}
};