/in/foo.cc: In function 'void dfs(int, int, LL)':
/in/foo.cc:34:9: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
         else
         ^~~~
/in/foo.cc:36:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
             return;
             ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:45:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k;
             ^