题目链接:CodeForces 332A Down the Hatch!
题意:n个人,你是0号,从0开始到n-1循环做动作。只要你前面三个人动作一样,你就喝一杯橙汁,问你能喝多少杯。
#include<iostream>
#include<cstdio>
#include<cmath>
#include<algorithm>
#include<string>
#include<cstring>
using namespace std;
typedef long long ll;
const int maxn = 10010;
const int INF = 0x3f3f3f3f;
int a[maxn];
int main()
{
int n;
scanf("%d",&n);
string s;
cin>>s;
int len = s.length(); //总轮数
int turns = 0;
int ans = 0;
for(int i=0; ;i = (i+1)%n)
{
turns++;
if(turns>len) //如果大于len,退出循环
break;
if(turns>=4&&i==0&&s[turns-2]==s[turns-3]&&s[turns-3]==s[turns-4])
ans++;
}
printf("%d\n",ans);
return 0;
}