/in/foo.cc: In function 'int main()':
/in/foo.cc:41:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  cin >> str+1;
         ~~~^~
/in/foo.cc:58:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i = 2; i <= n; i++)
  ^~~
/in/foo.cc:61:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   print(n, ans);
   ^~~~~