CADYDIST  Candy Distribution
Alice is a teacher that loves her students. As the school year reaches its end, she wants to reward all her students with candies for all their hard work.
Since each of her classes is unique, she decided she’ll give a different kind of candy for each class, and in order to avoid students being mad at others in their class, she wants to make things fair by giving all students in the same class the same kind of candy.
Happily, she went to the candy shop, and fortunately found out that it had N different types of candy, exactly the same number of classes of students she taught!
Looking at the prices and paying close attention to the number of students in each class, Alice noted that she could save some money by assigning the types of candy to certain classes. Because she’s a teacher, her income is not that big and saving money is very important to her, so she asked you to write a program to determine the least amount of money she must spend.
Input
Each test case consists of three lines. The first line contains a positive integer N (1 ≤ N ≤ 100000). The second line contains N integers C_{i}, the i^{th} integer indicates the number of students in Alice’s ith class. The third and last line also contains N integers P_{i} the i^{th} integer indicates the price of the i^{th} type of candy (1 ≤ C_{i}, P_{i} ≤ 100000).
The input ends with a line consisting of a 0, which indicates end of input.
Output
For each test case, output a line containing the least amount of money Alice must spend.
Example
Input: 4
1 1 1 1
2 2 2 2
5
10 80 37 22 109
6 8 8 20 15
0 Output: 8
2120
hide comments
sanjeev30798:
20200112 17:55:04
i would just say that avoid using cin in C++ for taking long long inputs rather use scanf 

dkkv0000:
20190508 11:11:00
very easy sum use unsigned long long int 

prabhav_123:
20190107 13:25:37
use long long..unless you don't want an headache! 

kranthi_0003:
20180811 16:21:30
getting sigsev in c++...dont know y,but AC in one go in python:)


khoaph:
20180629 05:35:43
Finally got AC after using long long for Ci, Pi 

anirudnits:
20180211 10:40:37
@vengatesh15 thanks :) 

karthik1997:
20170830 00:04:01
FAST i/o and cpp std:: sort : AC in 0.02s 

bsiddhartha:
20170703 07:08:02
Constraints are correct:)


kspoj:
20170419 07:46:02
stdlib's qsort killed it!! 

kspoj:
20170409 19:41:33
this is running fine in my compiler but I'm getting SIGSEGV error.

Added by:  Paulo Costa 
Date:  20120119 
Time limit:  0.301s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 
Resource:  ITA  Brazilian ICPC Training Camp, JanFeb/2012 