qq_42193011的博客

//      Stan Ford is a typical college graduate student, meaning that one of the most important things on his mind is where his next meal will be. Fortune has smiled on him as he’s been invited to a m...

#include <iostream>#include <stdio.h>#include <stdlib.h>#include <algorithm>#include <string.h>using namespace std;#define maxn 20#define LL long longLL digit[ma...

#include<bits/stdc++.h>typedef long long ll;using namespace std;const int mod = 998244353;void add(int &x,int y){ if((x+=y)>=mod)x-=mod;}int dp[502][502][2][2];char a[1000],b[...