全WA，求助，AC必关

#include<bits/stdc++.h>
using namespace std;
int n,p,p2,p3;
char cs;
int sl1,sl2;
string dw1,dw2;
struct dw_{
	string mz;
	int bh;
}a[6]={
    {"km",1},
    {"m",2},
    {"mm",3},
    {"kg",4},
    {"g",5},
    {"mg",6}
};
int main(){
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>sl1>>dw1>>cs>>cs>>dw2;
		for(int j=0;i<6;j++){
            if(dw1==a[j].mz){
                p=a[j].bh;
                break;
            }
        }
        for(int j=0;i<6;j++){
            if(dw2==a[j].mz){
                p2=a[j].bh;
                break;
            }
        }
        p3=p2-p;
        sl2=p3*1000*sl1;
        cout<<sl1<<" "<<dw1<<" = "<<sl2<<" "<<dw2<<endl;
	}
}