/in/foo.cc: In function 'int main()':
/in/foo.cc:15:44: warning: statement has no effect [-Wunused-value]
  {if(exist[i]>=max) {max=exist[i]; print[i]==1;}}
                                    ~~~~~~~~^~~
/in/foo.cc:6:37: warning: unused variable 's' [-Wunused-variable]
  int n,i,j,exist[200005]={0},max=-1,s,print[200005]={0};
                                     ^