C++哈希表解决

#include<unordered_map>
#include<iostream>
using namespace std;

int main(){
    unordered_map<int,string>um;
    int n;
    string names[8]={"除夕","初一","初二","初三",
    "初四","初五","初六","初七"};
    for (int i=0;i<8;i++){
        um.emplace(i+9,names[i]);
    }
    cin>>n;
    cout<<um.at(n);
}