foo.cc:2:207: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    2 | using namespace std;int a,h,m,s,t,b,c,d,e;string str;void p(int f,int g,int h,int k){b=abs((f*k)-(h*g));c=__gcd(b,g*k);d=b/c;e=g*k/c;if(e*180<d)d=e*360-d;if(e-1)cout<<d<<"/"<<e<<" ";else cout<<d<<" ";}main(){cin>>a;while(a--){scanf("%d:%d:%d",&h,&m,&s);h%=12;t=h*3600+m*60+s;p(t,120,t%3600,10);p(t,120,s*6,1);p(t%3600,10,s*6,1);cout<<endl;}}
      |                                                                                                                                                                                                               ^
foo.cc: In function 'int main()':
foo.cc:2:232: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    2 | using namespace std;int a,h,m,s,t,b,c,d,e;string str;void p(int f,int g,int h,int k){b=abs((f*k)-(h*g));c=__gcd(b,g*k);d=b/c;e=g*k/c;if(e*180<d)d=e*360-d;if(e-1)cout<<d<<"/"<<e<<" ";else cout<<d<<" ";}main(){cin>>a;while(a--){scanf("%d:%d:%d",&h,&m,&s);h%=12;t=h*3600+m*60+s;p(t,120,t%3600,10);p(t,120,s*6,1);p(t%3600,10,s*6,1);cout<<endl;}}
      |                                                                                                                                                                                                                                   ~~~~~^~~~~~~~~~~~~~~~~~~~~

Found 10 testcases.