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unordered_map的简介

unordered_map是一种容器，可以把字符串当做数字，可以使用[]操作符来访问key值对应的值。
格式：
unordered_map<要被转换的类型，转换的类型> 变量名{{要被转换的数或字符，转换的数或字符}}//两个大括号是初始化，注意字符串要加双引号

练习

[蓝桥省赛2021]垃圾分类
这道题用unordered_map打表就可以了(不是很长)

#include <bits/stdc++.h>
using namespace std;
unordered_map<string,string> d{{"leaves","FOOD WASTE"},{"watermelon peel","FOOD WASTE"},{"leftovers","FOOD WASTE"},{"paper box","RECYCLABLE"},{"plastic bottle","RECYCLABLE"},{"clothes","RECYCLABLE"},{"rechargeable battery","HAZARDOUS"},{"abandoned medicine","HAZARDOUS"},{"disinfectant","HAZARDOUS"},{"mask","RESIDUAL WASTE"},{"battery","RESIDUAL WASTE"},{"plastic bag","RESIDUAL WASTE"}};
unordered_map<string,int> e;
int a[100010];
int main() 
{int n,maxx=0;string s,g;cin>>n;getline(cin,s);for(int i=1;i<=n;i++){getline(cin,s);e[d[s]]++;if(e[d[s]]>maxx){maxx=e[d[s]];g=d[s];}}cout<<g<<endl<<maxx;return 0;
}