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map和set增刪查改

 //2.1 way one for(map<int,int>::iterator it=numCountMap.begin() ;it!=numCountMap.end();it++) { cout<<it->first<<" occurs "<<it->second<<" times"<<endl; } //2.1 way two ,c++11 useage for(const auto &it : numCountMap) { cout
<<it.first<<" occurs "<<it.second<<" times"<<endl; }