hello world

First trial post

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var a = function(req, res) {};
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int gcd(int a, int b) {
    if (b)
        return gcd(b,a%b);
    return a;
}
int main(int argc, char const *argv[]) {
    int a, b;
    scanf("%d%d", &a, &b);
    printf("%d\n", gcd(a,b));
    return 0;
}

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