要用long long

本题算式简单,用分支和字符串

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,m;
    long long s;
    string l1,d,w,l2;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>m>>l1>>d>>w>>l2;
        if((l1=="km"&&l2=="mm")||(l1=="kg"&&l2=="mg")){
            s=m*1000000;
            cout<<m<<" "<<l1<<" "<<d<<" "<<s<<" "<<l2<<endl;
        }
        else if((l1=="m"||l1=="g"&&l2=="mm"||l2=="mg")||(l1=="km"||l1=="kg"&&l2=="m"||l2=="g")){
                s=m*1000;
                cout<<m<<" "<<l1<<" "<<d<<" "<<s<<" "<<l2<<endl;
        }
        else if(l1==l2){
                s=m*1;
                cout<<m<<" "<<l1<<" "<<d<<" "<<s<<" "<<l2<<endl;
        }
    }
    return 0;
}