CodeForces——Game with string(STL stack栈）

Posted 2021-02-05 tonyyy

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Two people are playing a game with a string

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

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

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 #define ll long long
 4 int main()
 5 {
 6     string str;
 7     stack<char> s;
 8     cin>>str;
 9     int num = 0;
10     for(int i=0;i<str.length();i++)
11     {
12         //判断是否为空一定要放在前面
13         if(!s.empty() && str[i]==s.top())
14         {
15             num++;
16             s.pop();
17         }
18         else{
19             s.push(str[i]);
20         }
21     }
22     if(num%2==0)
23     {
24         cout<<"No"<<endl;
25     }else{
26         cout<<"Yes"<<endl;
27     }
28     return 0;
29 }

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