foo.cc:3:42: error: 'longlong' does not name a type; did you mean 'longjmp'?
 long long a[100005],n,m,p1,s1,s2,ans,sum;longlong tiger=0,dragon=0;
                                          ^~~~~~~~
                                          longjmp
foo.cc: In function 'int main()':
foo.cc:6:7: error: 'N' was not declared in this scope
  cin>>N;
       ^
foo.cc:17:10: error: 'mn' was not declared in this scope
   if(now<mn)mn=now,ans=i;
          ^~
foo.cc:17:10: note: suggested alternative: 'm'
   if(now<mn)mn=now,ans=i;
          ^~
          m

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