Flip Game II
Written on October 29, 2015
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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 two consecutive "++" 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 determine if the starting player can guarantee a win.
public class Solution {
public boolean canWin(String s) {
if (s == null || s.length() == 0) return false;
List<String> path = new ArrayList<String>();
for (int i = 1; i < s.length(); i++) {
if (s.charAt(i) == '+' && s.charAt(i-1) == '+') {
String newS = s.substring(0, i-1) +"--"+s.substring(i+1);
path.add(newS);
}
}
for (String str : path) {
if (!canWin(str)) {
return true;
}
}
return false;
}
}