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class TimeMap {
public:
unordered_map<string, set<pair<int,string>>> mp;
TimeMap() {
mp.clear();
}
void set(string key, string value, int timestamp) { mp[key].insert({timestamp, value}); }string get(string key, int timestamp) { if(mp[key].size() != 0){ auto it = mp[key].upper_bound({timestamp, "~"}); if(it == mp[key].begin()) return ""; --it; return it->second; } return "";}};
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