题解
Easy.
动态规划。
class Solution {
public:
int uniquePaths(int m, int n) {
vector<vector<int>> dp(m, vector<int>(n));
for(int i = 0; i < m; i++) dp[i][0] = 1;
for(int j = 0; j < n; j++) dp[0][j] = 1;
for(int i = 1; i < m; i++) {
for(int j = 1; j < n; j++) {
dp[i][j] = dp[i-1][j] + dp[i][j-1];
}
}
return dp[m-1][n-1];
}
};