U10783 名字被和谐了

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 #include<cmath>
 5 #include<queue>
 6 using namespace std;
 7 const int MAXN=2000001;
 8 const int INF = 1e8;
 9 inline void read(int &n)
10 {
11     char c=‘+‘;int x=0;bool flag=0;
12     while(c<‘0‘||c>‘9‘){c=getchar();if(c==‘-‘)flag=1;}
13     while(c>=‘0‘&&c<=‘9‘){x=x*10+c-48;c=getchar();}
14     n=flag==1?-x:x;
15 }
16 int fir;
17 int sed;
18 int ans;
19 bool flag;
20 int gcd(int a,int b)
21 {
22     if(b==0)    return a;
23     else     return gcd(b,a%b);
24 }
25 int main()
26 {
27     //freopen("a.in","r",stdin);
28     //freopen("c.out","w",stdout);
29     int a,b;
30     read(a);read(b);
31     int g=gcd(a,b);
32     for(int i=2;i<=g-1;i++)
33         if(g%i==0)
34         {
35             ans=g/i;
36             break;
37         }
38     if(ans==0&&g!=1)    cout<<"1";
39     else cout<<(ans==0?-1:ans);
40     return  0;
41 }