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#include "stdio.h" int gcd(int a, int b) { if (b == 0) return a; return gcd(b, a%b); } // gcd(9, 30) // gcd(30, 9%30=9) // gcd(9, 30%9=3) // gcd(3, 9%3=0) // return 3 int main() { int a, b; scanf("%d %d", &a, &b); printf("%d\n", gcd(a, b)); return 0; }
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