Two people are playing a game with a string ss, consisting of lowercase latin letters.
On a player's turn, he should choose two consecutive equal letters in the string and delete them.
For example, if the string is equal to "xaax" than there is only one possible turn: delete "aa", so the string will become "xx". A player not able to make a turn loses.
Your task is to determine which player will win if both play optimally.
Input
The only line contains the string ss, consisting of lowercase latin letters (1≤|s|≤1000001≤|s|≤100000), where |s||s| means the length of a string ss.
Output
If the first player wins, print "Yes". If the second player wins, print "No".
Examples
Input
Copy
abacaba
Output
Copy
No
Input
Copy
iiq
Output
Copy
Yes
Input
Copy
abba
Output
Copy
No
Note
In the first example the first player is unable to make a turn, so he loses.
In the second example first player turns the string into "q", then second player is unable to move, so he loses.
写了个双向链表暴力模拟， 开始过了，最后被hack的tle了。
正解o（n），用栈，类似匹配括号那样，因为取出哪个位置相邻的两个不影响最后胜负，真是智障如我。
#include<bits/stdc++.h>
using namespace std;
stack<char> s;
string str;
int main()
{
// freopen("input.in","r",stdin);
bool win=0;
cin>>str;
int len=str.length();
for(int i=0;i<len;i++)
{
if(s.empty())s.push(str[i]);
else
{
if(s.top()==str[i])s.pop(),win=!win;
else s.push(str[i]);
}
}
puts(win?"Yes":"No");
return 0;
}