爆0：code

$\texttt {AC}$：

#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read()
{
    int x=0,F=1;
    char ch=getchar();
    while(ch<'0'||ch>'9')
    {
        if(ch=='-')
            F=-1;
        ch=getchar();
    }
    while(ch>='0' && ch<='9')
        x=x*10+ch-'0',ch=getchar();
    return x*F;
}
void write(int x)
{
    if(x<0)
        putchar('-'),x=-x;
    if(x>9)
        write(x/10);
    putchar(x%10+'0');
    return;
}
const int N=1E5+5, maxn=25;
int n, l, len, a[maxn], f[N];
string s;
signed main(){
	//泥嚎，写题吧骚年
	n=read();
	for(int i=1; i<=n; ++i)a[i]=read();
	l=read(); cin>>s;
	for(int i=1; i<=l; ++i)
	{	f[i]=f[i-1];
		for(int j=1; j<=n; ++j)
		{
			int k=i-j*3;
			if(k<0)break;
			if(s.substr(k, 3)=="abc")f[i]=max(f[i], a[j]+f[k]);
			else break;
		}
	}
	write(f[l]);
	return 0;
}

请教大佬