UVa-10976 Fractions Again?!

#include <bits/stdc++.h>
#define _for(i,a,b) for(int i = (a);i < (b);i ++)
using namespace std;

bool ok(int y,int k)
{
    return (y*k%(y-k)==0);
}

int forx(int y,int k)
{
    return y*k/(y-k);
}

int main()
{
    int k;
    while(~scanf("%d",&k))
    {
        int n = 0;
        vector<pair<int,int>> v; 
        
        _for(i,k+1,2*k+1)
        {
            if(ok(i,k))
            {
                
                n ++;
                v.push_back({forx(i,k),i});
            }
            
        }
        
        printf("%d
",n);
        _for(i,0,v.size())
            printf("1/%d = 1/%d + 1/%d
",k,v[i].first,v[i].second);
    }
    return 0;
}