C++unordered_map的用法

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;
}