delete pics to save space

history_source/信息学奥赛一本通/2.4.12.cpp

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+#include<iostream> 
+using namespace std;
+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);
+	}
+}
+long long lcm(long long a,long long b)
+{
+	return a/gcd(a,b)*b;
+}
+struct fen
+{
+	long long a,b;
+	fen operator+(fen bb)
+	{
+		fen aa;
+		aa.a=a;
+		aa.b=b;
+		fen ans;
+		ans.b=lcm(aa.b,bb.b);
+		ans.a=ans.b/aa.b*aa.a+ans.b/bb.b*bb.a;
+		long long gon=gcd(ans.a,ans.b);
+		ans.a/=gon;
+		ans.b/=gon;
+		return ans;
+	}
+};
+fen make_fen_li;
+fen make_fen(long long a,long long b)
+{
+	make_fen_li.a=a;
+	make_fen_li.b=b;
+	return make_fen_li;
+}
+int main()
+{
+	int n;
+	cin>>n;
+	long long a,b;
+	char li;
+	cin>>a>>li>>b;
+	fen ans;
+	ans=make_fen(a,b);
+	for(int i=1;i<n;i++)
+	{
+		cin>>a>>li>>b;
+		ans=ans+make_fen(a,b);
+	}
+	if(ans.b!=1) printf("%lld/%lld\n",ans.a,ans.b);
+	else printf("%lld\n",ans.a);
+	return 0;
+}
+