// Flip Game
class Solution {
public:
  vector<string> generatePossibleNextMoves(string s) {
    vector<string> r;
    for (int i = 0; i+1 < s.size(); i++)
      if (s[i] == '+' && s[i+1] == '+') {
        r.push_back(s);
        r.back()[i] = '-';
        r.back()[i+1] = '-';
      }
    return r;
  }
};