delete pics to save space

5.1203C.cpp

@@ -0,0 +1,75 @@
+#include<cstdio>
+struct char_reader
+{
+	FILE* f;
+	char *buf,*p1,*p2;
+	int size;
+	char_reader(FILE* fin,int bufsize=100000)
+	{
+		f=fin;
+		size=bufsize;
+		p1=p2=0;
+		buf=new char[bufsize];
+	}
+	inline int operator()()
+	{
+		return p1==p2&&(p2=(p1=buf)+fread(buf,1,size,f),p1==p2)?EOF:*p1++;
+	}
+};
+struct char_writer
+{
+	FILE* f;
+	char *buf,*p,*end;
+	char_writer(FILE* fout,int bufsize=100000)
+	{
+		f=fout;
+		buf=new char[bufsize];
+		p=buf;
+		end=buf+bufsize;
+	}
+	~char_writer()
+	{
+		fwrite(buf,p-buf,1,f);
+	}
+	inline char operator()(char ch)
+	{
+		return end==p&&(fwrite(buf,end-buf,1,f),p=buf),*p++=ch;
+	}
+};
+char_reader gch(stdin);
+char_writer wch(stdout);
+template<typename T> inline void read(T& t)
+{
+	t=0; bool f=false; char ch;
+	while(ch=gch(),!((ch>='0'&&ch<='9')||ch=='-'));
+	if(ch=='-') f=true,ch=gch();
+	t=ch-'0';
+	while(ch=gch(),ch>='0'&&ch<='9') t=t*10+ch-'0';
+	if(f) t=-t;
+}
+#if __cplusplus >= 201103L
+template<typename T,typename... Args> inline void read(T& t,Args&... args) { read(t); read(args...); }
+#endif
+#include<cstring>
+#include<algorithm>
+using namespace std;
+typedef long long LL;
+LL n,x,g,res;
+LL gcd(LL a,LL b) { return b?gcd(b,a%b):a; }
+int main()
+{
+	#ifdef local
+	freopen("pro.in","r",stdin);
+	#endif
+	g=0;
+	read(n);
+	for(int i=0;i<n;i++) { read(x); g=gcd(g,x); }
+	for(LL i=1;i*i<=g;i++)
+		if(g%i==0)
+		{
+			res+=2;
+			if(i*i==g) res--;
+		}
+	printf("%I64d\n",res);
+	return 0;
+}