Pinta-ala

// a+1 b+1 = A/b + b = B- 1 - A
 
#include <iostream>
#include <vector>
#include <tuple>
#include <cmath>
 
int main()
{
    int t;
    std::cin >> t;
 
    std::vector<bool> yesNo;
 
    for(int i = 0; i < t; i++)
    {
        int a, b;
        std::cin >> a >> b;
 
        bool yes = false;
 
        // Find all possible multiples and check:
        for(int j = 1; j < std::ceil(std::sqrt(a)); j++)
        {
            if(a % j == 0)
                if( (a / j + 1) * (j + 1) == b - 1)
                {
                    yes = true;
                    break;
                }    
        }
 
        yesNo.push_back(yes);
    }
 
    for(auto a : yesNo)
    {
        if(a)
            std::cout << "YES\n";
        else
            std::cout << "NO\n";
    }
 
    // Flawed test...
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER