这个引用好精髓。

 1 #include <iostream>
 2 #include <cstring>
 3 #include <string>
 4 #include <map>
 5 #include <set>
 6 #include <algorithm>
 7 #include <fstream>
 8 #include <cstdio>
 9 #include <cmath>
10 #include <stack>
11 #include <queue>
12 using namespace std;
13 const double Pi=3.14159265358979323846;
14 typedef long long ll;
15 const int MAXN=5000+5;
16 const int dx[5]={0,0,0,1,-1};
17 const int dy[5]={1,-1,0,0,0};
18 const int INF = 0x3f3f3f3f;
19 const int NINF = 0xc0c0c0c0;
20 const ll mod=1e9+7;
21 
22 bool solve(int &w)
23 {
24     int w1,w2,d1,d2;
25     cin>>w1>>d1>>w2>>d2;
26     bool b1=true,b2=true;
27     if(!w1) b1=solve(w1);
28     if(!w2) b2=solve(w2);
29     w=w1+w2;
30     return (b1&&b2&&(d1*w1==d2*w2));
31 }
32 
33 
34 int main()
35 {
36     int t;cin>>t;
37     while(t--)
38     {
39         int w;
40         if(solve(w)) cout <<"YES\n";
41             else cout <<"NO\n";
42         if(t) cout<<"\n";
43     }
44     return 0;
45  }