大家不用模仿我用map做

由于当时在做梦，看见两个值直接上map了

#include <iostream>
#include <map>
#include <string>
#include <limits>
int main() {
    std::map<std::string, int> cities;
    std::string city;
    int temp;
    while(std::cin >> city >> temp) {
        cities[city] = temp;
    }
    std::string min_city;
    int min_temp = std::numeric_limits<int>::max();
    for(const auto& pair : cities) {
        if(pair.second < min_temp) {
            min_temp = pair.second;
            min_city = pair.first;
        }
    }
    if(!min_city.empty()) {
        std::cout << min_city << std::endl;
    }
    return 0;
}