Problem:
Score : 100 points

Problem Statement

In AtCoder City, there are three stations numbered 1, 2, and 3.

Each of these stations is operated by one of the two railway companies, A and B. A string S of length 3 represents which company operates each station. If S_i is A, Company A operates Station i; if S_i is B, Company B operates Station i.

To improve the transportation condition, for each pair of a station operated by Company A and one operated by Company B, there will be a bus service connecting them.

Determine if there is a pair of stations that will be connected by a bus service.

Constraints

Each character of S is A or B.

|S| = 3

Input

Input is given from Standard Input in the following format:

S

Output

If there is a pair of stations that will be connected by a bus service, print Yes; otherwise, print No.

Sample Input 1

ABA

Sample Output 1

Yes

Company A operates Station 1 and 3, while Company B operates Station 2.

There will be a bus service between Station 1 and 2, and between Station 2 and 3, so print Yes.

Sample Input 2

BBA

Sample Output 2

Yes

Company B operates Station 1 and 2, while Company A operates Station 3.

There will be a bus service between Station 1 and 3, and between Station 2 and 3, so print Yes.

Sample Input 3

BBB

Sample Output 3

No

Company B operates all the stations. Thus, there will be no bus service, so print No.

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<string.h>
int main(){
  char s[100001];
  int q,i,rev=0,len;
  scanf("%s",s);
  scanf("%d",&q);
  len=strlen(s);
  char be[q+1],af[q+1];
  int benum=0,afnum=0;
  int t[q+1],f;
  for(i=0;i<q;i++){
    scanf("%d",&t[i]);
    if(t[i]==1)
      rev++;
    else{
      scanf("%d ",&f);
      if((rev+f)%2==0)
        scanf("%c",&af[afnum++]);
      else
        scanf("%c",&be[benum++]);
    }
  }
  if(rev%2==0){
    for(i=benum-1;i>=0;i--)
      printf("%c",be[i]);
    for(i=0;i<len;i++)
      printf("%c",s[i]);
    for(i=0;i<afnum;i++)
      printf("%c",af[i]);
    }
  else{
    for(i=afnum-1;i>=0;i--)
      printf("%c",af[i]);
    for(i=len-1;i>=0;i--)
      printf("%c",s[i]);
    for(i=0;i<benum;i++)
      printf("%c",be[i]);
    }
  printf("\n");
  return 0;
}