UVA-11417 GCD

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int gcd(int a,int b)
{
    int x,y,r;
    x=a;
    y=b;
    while(y!=0)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int main()
{
    int n,i,j,g;
    while(cin>>n)
    {
        g=0;
        if(n==0)
        {
            break;
        }
        for(i=1;i<n;i++)
        {
            for(j=i+1;j<=n;j++)
            {
                g=g+gcd(i,j);
            }
        }
         cout<<g<<endl;
    }

    return 0;
}

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About Ashadullah Shawon

I am Ashadullah Shawon. I am a Software Engineer. I studied Computer Science and Engineering (CSE) at RUET. I Like To Share Knowledge. Learn More: Click Here