/in/foo.cc: In function 'long long int dfs(int)':
/in/foo.cc:19:15: warning: unused variable 't' [-Wunused-variable]
     long long t=0,maxx=0;
               ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:48:10: warning: unused variable 'zkj' [-Wunused-variable]
     bool zkj=1;
          ^~~