Solution.cpp

class Solution {
public:
    vector<string> generatePossibleNextMoves(string s) {
        vector<string> ans;
        for (int i = 0; i < s.size() - 1; ++i) {
            if (s[i] == '+' && s[i + 1] == '+') {
                s[i] = s[i + 1] = '-';
                ans.emplace_back(s);
                s[i] = s[i + 1] = '+';
            }
        }
        return ans;
    }
};