CF1440A.Buy the String

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题目描述

You are given four integers $n$ , $c_0$ , $c_1$ and $h$ and a binary string $s$ of length $n$ .

A binary string is a string consisting of characters $0$ and $1$ .

You can change any character of the string $s$ (the string should be still binary after the change). You should pay $h$ coins for each change.

After some changes (possibly zero) you want to buy the string. To buy the string you should buy all its characters. To buy the character $0$ you should pay $c_0$ coins, to buy the character $1$ you should pay $c_1$ coins.

Find the minimum number of coins needed to buy the string.

输入格式

The first line contains a single integer $t$ ( $1 \leq t \leq 10$ ) — the number of test cases. Next $2t$ lines contain descriptions of test cases.

The first line of the description of each test case contains four integers $n$ , $c_{0}$ , $c_{1}$ , $h$ ( $1 \leq n, c_{0}, c_{1}, h \leq 1000$ ).

The second line of the description of each test case contains the binary string $s$ of length $n$ .

输出格式

For each test case print a single integer — the minimum number of coins needed to buy the string.

输入输出样例

输入#1

6
3 1 1 1
100
5 10 100 1
01010
5 10 1 1
11111
5 1 10 1
11111
12 2 1 10
101110110101
2 100 1 10
00

输出#1

说明/提示

In the first test case, you can buy all characters and pay $3$ coins, because both characters $0$ and $1$ costs $1$ coin.

In the second test case, you can firstly change $2$ -nd and $4$ -th symbols of the string from $1$ to $0$ and pay $2$ coins for that. Your string will be $00000$ . After that, you can buy the string and pay $5 \cdot 10 = 50$ coins for that. The total number of coins paid will be $2 + 50 = 52$ .

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