115. Distinct Subsequences
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class Solution {public: int numDistinct(string s, string t) { if (s.empty() || t.empty()) return 0; vector<vector<int>> dp(s.size(), vector<int>(t.size(), 0)); for (int si = 0; si < s.size(); ++si) for (int tj = 0; tj < t.size(); ++tj){ if (s[si] == t[tj]){ if (tj == 0) dp[si][tj] = 1; else if (si != 0) dp[si][tj] = dp[si - 1][tj - 1]; } if (si != 0) dp[si][tj] += dp[si - 1][tj]; } return dp[s.size() - 1][t.size() - 1]; }};
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