delete pics to save space

history_source/信息学奥赛一本通/2.4.10.cpp

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+#include<cstdio>
+long long t;
+long long gcd(long long a,long long b)
+{
+	if(a==b) return a;
+	if(a<b)
+	{
+		t=a;
+		a=b;
+		b=t;
+	}
+	if(a&1)
+	{
+		if(b&1) return gcd(b,a-b);
+		else return gcd(a,b>>1);
+	}
+	else
+	{
+		if(b&1) return gcd(a>>1,b);
+		return 2*gcd(a>>1,b>>1);
+	}
+}
+int main()
+{
+	long long a,b;
+	scanf("%lld%lld",&a,&b);
+	printf("%lld\n",gcd(a,b));
+	return 0;
+}
+