亲和数（因子和）

 1 #include<iostream>
 2 #include<iomanip>
 3 //#include<bits/stdc++.h>
 4 #include<cstdio>
 5 #include<algorithm>
 6 #include<cmath>
 7 #define PI  3.14159265358979
 8 #define LL long long
 9 #define INF  10000001000
10 #define  eps   0.00000001
11 using namespace std;
12 int main()
13 {
14    int T;
15     cin>>T;
16     while(T--)
17     {
18         int a,b;
19         cin>>a>>b;
20         int sum1=0,sum2=0;
21         for(int i=2;i<=sqrt(a);++i)
22         {
23             if(a%i==0) {if(a/i==i) sum1+=i;
24             else {sum1+=i,sum1+=a/i;}}
25         }
26         for(int i=2;i<=sqrt(b);++i)
27         {
28               if(b%i==0) {if(b/i==i) sum2+=i;
29             else {sum2+=i,sum2+=b/i;}}
30         }
31         sum1++;sum2++;
32        // cout<<sum1<<" "<<sum2;return 0;
33         if(sum1==b&&sum2==a) cout<<"YES"<<endl;
34         else cout<<"NO"<<endl;
35 
36     }
37 
38 
39 }