package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var t int
	if _, err := fmt.Fscan(in, &t); err != nil {
		return
	}

	for i := 0; i < t; i++ {
		var n int
		fmt.Fscan(in, &n)

		pref := make([]int64, n+1)
		for j := 0; j < n; j++ {
			var val int64
			fmt.Fscan(in, &val)
			pref[j+1] = pref[j] + val
		}

		var s string
		fmt.Fscan(in, &s)

		var ans int64 = 0
		l := 0
		r := n - 1

		for l < r {
			if s[l] == 'L' && s[r] == 'R' {
				ans += pref[r+1] - pref[l]
				l++
				r--
			} else if s[l] != 'L' {
				l++
			} else if s[r] != 'R' {
				r--
			}
		}
		fmt.Fprintln(out, ans)
	}
}