Bark to Unlock CodeForces

判自身，判相接

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <cmath>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <ctype.h>
#include <vector>
#include <algorithm>
#include <sstream>
#define PI acos(-1.0)
#define in freopen("in.txt", "r", stdin)
#define out freopen("out.txt", "w", stdout)
using namespace std;
typedef long long ll;
const int maxn = 1000 + 7, INF = 0x7f7f7f7f, mod = 1e9 + 7;
int n;
char s[4], t[6];int main() {scanf("%s", s);scanf("%d", &n);int f1 = 0, f2 = 0;for(int i = 0; i < n; ++i) {scanf("%s", t);if(t[0] == s[0] && t[1] == s[1]) { f1 = f2 = 1; }if(t[0] == s[1]) f1 = 1;if(t[1] == s[0]) f2 = 1;}if(f1 + f2 == 2) puts("YES");else puts("NO");return 0;
}

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