LeetCode 293: Flip Game Solution

Master LeetCode problem 293 (Flip Game), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

293. Flip Game

Easy

String

Problem Explanation

Explanation

This problem asks to determine all possible states after flipping a "++" to "--" in a given string. We can solve this by iterating through the string and checking each occurrence of "++". If found, we can flip it to "--" and add the resulting string to our list of solutions.

Initialize an empty list to store solutions.
Iterate through the string, checking for occurrences of "++".
If found, create a new string by flipping the "++" to "--" and add it to the list of solutions.
Return the list of solutions.

Time Complexity: O(n) where n is the length of the input string. Space Complexity: O(n) considering the space required to store the resulting solutions.

Solution Code

import java.util.ArrayList;
import java.util.List;

class Solution {
    public List<String> generatePossibleNextMoves(String s) {
        List<String> result = new ArrayList<>();
        
        for (int i = 0; i < s.length() - 1; i++) {
            if (s.charAt(i) == '+' && s.charAt(i + 1) == '+') {
                StringBuilder sb = new StringBuilder(s);
                sb.setCharAt(i, '-');
                sb.setCharAt(i + 1, '-');
                result.add(sb.toString());
            }
        }
        
        return result;
    }
}

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