unordered_set/unordered_map 增删查操作unordered_setunordered_map
unordered_set//引入头文件#include<unordered_set>//创建unordered_set<int> num;//添加num.insert(3);//删除num.erase(3);//查找if(num.find(3)==num.end()) cout<<"3 is not found!";unordered_map//引入头文件#include<un
