/in/foo.cc: In function 'int dfs(int, int, int, int, int)':
/in/foo.cc:17:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if( int(2*(n-v)/lastr) + s >= ans) 
     ^~
/in/foo.cc:19:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  for(int i=min(lastr-1,int(sqrt(n-v)));i>=k;i--){ // r
  ^~~
/in/foo.cc:26:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^