/in/foo.cc: In function 'int main()':
/in/foo.cc:20:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (int i=1;i<=len;i++)
  ^~~
/in/foo.cc:23:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   if (ans!=0) printf("%d %d\n",ans,cnt);
   ^~