Flip Game

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

func generatePossibleNextMoves(currentState string) []string {
    out := []string{}
    for i := 0; i+1 < len(currentState); i++ {
        if currentState[i] == '+' && currentState[i+1] == '+' {
            b := []byte(currentState)
            b[i] = '-'
            b[i+1] = '-'
            out = append(out, string(b))
        }
    }
    return out
}

from typing import List

class Solution:
    def generatePossibleNextMoves(self, currentState: str) -> List[str]:
        out: List[str] = []
        for i in range(len(currentState) - 1):
            if currentState[i] == '+' and currentState[i + 1] == '+':
                out.append(currentState[:i] + '--' + currentState[i + 2:])
        return out

var generatePossibleNextMoves = function(currentState) {
    const out = [];
    for (let i = 0; i + 1 < currentState.length; i++) {
        if (currentState[i] === '+' && currentState[i + 1] === '+') {
            out.push(currentState.slice(0, i) + '--' + currentState.slice(i + 2));
        }
    }
    return out;
};

class Solution {
    public List<String> generatePossibleNextMoves(String currentState) {
        List<String> out = new ArrayList<>();
        char[] arr = currentState.toCharArray();
        for (int i = 0; i + 1 < arr.length; i++) {
            if (arr[i] == '+' && arr[i + 1] == '+') {
                char[] copy = arr.clone();
                copy[i] = '-';
                copy[i + 1] = '-';
                out.add(new String(copy));
            }
        }
        return out;
    }
}

function generatePossibleNextMoves(currentState: string): string[] {
    const out: string[] = [];
    for (let i = 0; i + 1 < currentState.length; i++) {
        if (currentState[i] === '+' && currentState[i + 1] === '+') {
            out.push(currentState.slice(0, i) + '--' + currentState.slice(i + 2));
        }
    }
    return out;
}