Runtime Error
/in/foo.cc: In function 'void dfs(int)':
/in/foo.cc:14:20: warning: unused variable 'sum' [-Wunused-variable]
int newk=0,sum=0;
^~~
/in/foo.cc: In function 'void dfs(int)':
/in/foo.cc:14:20: warning: unused variable 'sum' [-Wunused-variable]
int newk=0,sum=0;
^~~
