ACM--字符串--Two Substrings--水

本文探讨了一个字符串问题,即判断给定的字符串是否包含两个非重叠的子串“AB”和“BA”。通过使用strstr()函数进行查找,并确保两个子串不发生重叠。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >


题目地址:传送门



D - Two Substrings
Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u

Description

You are given string s. Your task is to determine if the given string s contains two non-overlapping substrings "AB" and "BA" (the substrings can go in any order).

Input

The only line of input contains a string s of length between 1 and 105 consisting of uppercase Latin letters.

Output

Print "YES" (without the quotes), if string s contains two non-overlapping substrings "AB" and "BA", and "NO" otherwise.

Sample Input

Input
ABA
Output
NO
Input
BACFAB
Output
YES
Input
AXBYBXA
Output
NO

Hint

In the first sample test, despite the fact that there are substrings "AB" and "BA", their occurrences overlap, so the answer is "NO".

In the second sample test there are the following occurrences of the substrings: BACFAB.

In the third sample test there is no substring "AB" nor substring "BA".




题解:这里可以使用strstr()函数,需要<string.h>头文件


#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;
char s[100001];
int main(){
   char *c;
   scanf("%s",&s);
   if((c=strstr(s,"AB"))!=NULL&&strstr(c+2,"BA")!=NULL){
        printf("YES\n");
        return 0;
   }
   if((c=strstr(s,"BA"))!=NULL&&strstr(c+2,"AB")!=NULL){
        printf("YES\n");
        return 0;
   }
   printf("NO\n");
}






评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值