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class Solution {
public:
int uniquePaths(int m, int n) {
if (m > n) return uniquePaths(n, m);
vector<int> cur(m, 1);
for (int j = 1; j < n; j++)
for (int i = 1; i < m; i++)
cur[i] += cur[i - 1];
return cur[m - 1];
}
};
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