LeetCode Solutions
class Solution {
public:
int uniquePaths(int m, int n) {
// dp[i][j] := unique paths from (0, 0) to (i, j)
vector<vector<int>> dp(m, vector<int>(n, 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];
}
};
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class Solution {
public int uniquePaths(int m, int n) {
// dp[i][j] := unique paths from (0, 0) to (i, j)
int[][] dp = new int[m][n];
Arrays.stream(dp).forEach(row -> Arrays.fill(row, 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];
}
}
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class Solution:
def uniquePaths(self, m: int, n: int) -> int:
# dp[i][j] := unique paths from (0, 0) to (i, j)
dp = [[1] * n for _ in range(m)]
for i in range(1, m):
for j in range(1, n):
dp[i][j] = dp[i - 1][j] + dp[i][j - 1]
return dp[-1][-1]
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