293. Flip Game

 

You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend take turns to flip twoconsecutive "++" into "--". The game ends when a person can no longer make a move and therefore the other person will be the winner.

Write a function to compute all possible states of the string after one valid move.

For example, given s = "++++", after one move, it may become one of the following states:

[
  "--++",
  "+--+",
  "++--"
]

 

If there is no valid move, return an empty list [].

 

这道题让我们把相邻的两个 ++ 变成 –,真不是一道难题,就从第二个字母开始遍历,每次判断当前字母是否为+,和之前那个字母是否为+,如果都为加,则将翻转后的字符串存入结果中即可,参见代码如下:

 

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

 

Github 同步地址:

https://github.com/grandyang/leetcode/issues/293

 

类似题目:

Flip Game II

 

参考资料:

https://leetcode.com/problems/flip-game/description/

https://leetcode.com/problems/flip-game/discuss/73901/4-lines-in-Java

https://leetcode.com/problems/flip-game/discuss/73902/Simple-solution-in-Java

 

LeetCode All in One 题目讲解汇总(持续更新中…) 


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