Flip Game
给一个string里面是+和-, 求反转连续两个+后的所以可能string.
class Solution {
public List<String> generatePossibleNextMoves(String s) {
List<String> res = new ArrayList<>();
StringBuilder sb = new StringBuilder(s);
for(int i = 0 ; i+1 < sb.length(); i++) {
if(sb.charAt(i) == '+' && sb.charAt(i+1) == '+') {
StringBuilder t = new StringBuilder(s);
t.setCharAt(i, '-');
t.setCharAt(i+1, '-');
res.add(t.toString());
}
}
return res;
}
}