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Euclid algorithm to find gcd

#include<iostream>
#include<algorithm>
using namespace std;
int gcd(int m,int n)
{
    while(n%m!=0)
    {
        int r=n%m;
        n=m;
        m=r;
    }
    return m;
}
int main()
{
    int m,n;
    cout<<"Enter two numbers"<<endl;
    cin>>m>>n;
    cout<<gcd(m,n);
    return 0;
}

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