AC题解

如下：

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;cin>>n;
    for(int i=0;i<n;i++){
        int x;string s1,s2,q,p;//q:储存“=”p:储存“？”
        cin>>x>>s1>>q>>p>>s2;
        long long re=0;
        if(s1=="km" and s2=="m"){re=x*1000;}
        else if(s1=="km" and s2=="mm"){re=x*1000000;}
        else if(s1=="m" and s2=="mm"){re=x*1000;}
        else if(s1=="kg" and s2=="g"){re=x*1000;}
        else if(s1=="kg" and s2=="mg"){re=x*1000000;}
        else if(s1=="g" and s2=="mg"){re=x*1000;}//逐个判断
        cout<<x<<' '<<s1<<" = "<<re<<" "<<s2<<endl;//输出
    }