codeforces 431A Black Square

最新推荐文章于 2022-08-06 22:12:46 发布

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本文介绍了一款名为BlackSquare的游戏，玩家需根据屏幕上的指示触摸对应区域消除黑方块。通过输入游戏过程中出现黑方块的位置序列及各区域消耗的热量值，计算出完成游戏所需的总热量。

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Quite recently, a very smart student named Jury decided that lectures are boring, so he downloaded a game called "Black Square" on his super cool touchscreen phone.

In this game, the phone's screen is divided into four vertical strips. Each second, a black square appears on some of the strips. According to the rules of the game, Jury must use this second to touch the corresponding strip to make the square go away. As Jury is both smart and lazy, he counted that he wastes exactly ai calories on touching the i-th strip.

You've got a string s, describing the process of the game and numbers a1, a2, a3, a4. Calculate how many calories Jury needs to destroy all the squares?

Input

The first line contains four space-separated integers a1, a2, a3, a4 (0 ≤ a1, a2, a3, a4 ≤ 104).

The second line contains string s (1 ≤ |s| ≤ 105), where the і-th character of the string equals "1", if on the i-th second of the game the square appears on the first strip, "2", if it appears on the second strip, "3", if it appears on the third strip, "4", if it appears on the fourth strip.

Output

Print a single integer — the total number of calories that Jury wastes.

水题

#include<cstdio>
#include<iostream>
#include<cstring>
#define ll long long
using namespace std;
const int ma=1e5+10;
int main()
{
    ll a[5];
    ll s=0;
    char str[ma];
    cin>>a[1]>>a[2]>>a[3]>>a[4];
    cin>>str;
    ll len=strlen(str);
    for(int i=0;i<len;i++)
    {
        int t=str[i]-'0';
        s+=a[t];
    }
    cout<<s<<endl;
    return 0;
}