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class Solution { public: string s; int n; unordered_map<string, bool> exist; int dp[2222]; int rec(int at) { if(at >= s.size()) { return 1; } if(dp[at] != -1) { return dp[at]; } int res = 0; string tmp = ""; for(int i = at; i < s.size(); i++) { tmp += s[i]; if(exist[tmp]) { res = max(res, rec(at + tmp.size())); } } return dp[at] = res; } int wordBreak(int n, string s, vector<string> &dictionary) { this->n = n; this->s = s; for(string s : dictionary) { exist[s] = true; } memset(dp, -1, sizeof dp); return rec(0); } };
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