Chefland and Electricity

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There are n villages in a Chefland. Some of the villages have electricity facilities, other doesn't. You can consider the villages arranged in line in the order 1 to n from left to right. ith of village can be considered at x_{i} coordinates.
Chef decided that electricity should be provided to all the villages. So, he decides to buy some amount of electric wires to connect the villeges without electricity to some villages with electricity. As Chef does not want to spend too much amount of money on wires, can you find out minimum amount of length of wire Chef should buy.
Input
First line of the input contains an integer T denoting the number of test cases. T test cases follow.
First line of each test case contains an integer n denoting number of villages in Chefland.
Second line will contain a string of length n containing '0' or '1's only. If ith character of the string is '1', then it denotes that ith village has electricity.
Next line contains n space separated integers denoting the x coordinates of the villages in the order from village 1 to n
Output
For each test case, output a single line containing a integer corresponding to the minimum length of wire Chef needs to buy.
Constraints
 1 ≤ T ≤ 10
 It is guaranteed that there will be at least one village which will have electricity.
 1 ≤ x_{1} < x_{2} < ... < x_{n} ≤ 10^{9}
Subtasks
Subtask #1 : 30 points
 1 ≤ N ≤ 1000
Subtask #2 : 70 points
 1 ≤ N ≤ 10^{5}
Example
Input 2 2 01 1 2 3 100 1 5 6 Output: 1 5
Explanation
In the first example, first village does not have electricity. If we put a wire between village 1 and 2 of length 1, then both the villages will have electricity.
In the second example,
We can a draw a wire from first village to third village, passing through second village. Its total length will be 5. Now all the villages will have electricity. This is the minimum length of wire you will require.
Author:  admin2 
Tester:  mugurelionut 
Editorial  http://discuss.codechef.com/problems/CHEFELEC 
Tags  admin2, greedy, july16, simple 
Date Added:  5062016 
Time Limit:  1 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.6, PYPY, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, SCM chicken, PYP3, CLOJ, FS 
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