codeforces 431A - Black Square

#include <cstdio>#include <iostream>#include <cstring>#include <algorithm>#include <queue>#include <stack>#include <vector>using namespace std;typedef long long ll;int a[5];char str[100000];int main(){    scanf("%d%d%d%d",&a[1],&a[2],&a[3],&a[4]);    scanf("%s",str);    int s = 0;    for(int i = 0;str[i];i++){        int s1 = str[i] - '0';        s += a[s1];    }    printf("%d\n",s);    return 0;}