1473B - String LCM - CodeForces Solution

brute force math number theory strings *1000

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Python Code: 

import math
def lcm(s, k):
    res = ""
    while k > 0:
        res += s
        k -= 1
    return res
for _ in range(int(input())):
    s = input()
    t = input()
    n, m = len(s), len(t)
    g = math.gcd(n, m)
    x = lcm(s, m // g)
    y = lcm(t, n // g)
    if x == y:
      print(x)
    else:
      print(-1)

C++ Code: 

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long tt;
    cin>>tt;
    while(tt--)
    {
        long long m,n,i,j,k,l,p,q,r,lcm;
        string s1,s2,s3="",s4="";
        cin>>s1>>s2;
        p=s1.size();
        q=s2.size();
        r=__gcd(p,q);
        lcm=(p*q)/r;
        for(i=0;i<lcm/p;i++)
        {
            s3=s3+s1;
        }
        for(i=0;i<lcm/q;i++)
        {
            s4=s4+s2;
        }
        if(s3==s4)
        {
            cout<<s3<<endl;
        }
        else
            cout<<-1<<endl;
    }
}


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