TAP2013G  War
[The original version of this problem (in Spanish) can be found at http://www.dc.uba.ar/events/icpc/download/problems/tap2013problems.pdf]
War, an event worthy only of appearance in literature, movies or perhaps programming contests, has reached the Nlogonian empire, which is facing the neighboring empire of Quadradonia.
War protocols agreed upon by both parties indicate that the war will be waged in successive battles, in each of which a different soldier from each empire will face one another, so that each soldier will take part in exactly one battle. The empire that wins more battles will then win the war.
Each empire has an army formed by S soldiers, and each soldier has a certain combat skill. In each battle between two soldiers, the one with greatest combat skill wins the battle. If both soldiers have the same combat skills, the battle is declared a draw and technically no side claims victory. The spies of Nlogonia have intercepted secret information concerning the combat skill of each soldier of Quadradonia's army, so Nlogonia's queen requires your assistance in order to calculate the maximum number of battles that can be won during the war if her soldiers are sent in the appropriate order.
Input
The first line contains an integer number S representing the number of soldiers in each army (1 ≤ S ≤ 10^{5}). The second line contains S integer numbers Q_{i} representing the combat skills of the different soldiers of Quadradonia's army, in the order in which the battles shall take place (1 ≤ Q_{i} ≤ 10^{9} for i = 1, ..., S). The third line contains S integer numbers N_{i} representing the combat skills of the different soldiers in Nlogonia's army, in an arbitrary order (1 ≤ N_{i} ≤ 10^{9} for i = 1, ..., S).
Output
Print a line containing a single integer number representing the maximum number of battles that Nlogonia can win during the war.
Example 1
Input: 3 2 1 1000000000 1 1 2 Output: 1
Example 2
Input: 4 6 3 1 4 2 7 4 3 Output: 3
hide comments
phoemur:
20181102 23:43:33
AC in one go, 2 pointers technique 

chrisea:
20171106 05:14:15
Last edit: 20171106 05:18:33 

chetan_555:
20171105 13:30:00
ac in one go,,, 

akshayvenkat:
20160610 10:35:32
O(2*n*log n)+ O(n) [separated loops] > 0.31 AC


MAYANK NARULA:
20151213 17:19:40
I used Binary Search for computational part with vectors,iterators and got tle....


[Mayank Pratap]:
20150722 17:39:19
Author has chosen funny names of empires .... O(nlogn) vs O(n^2).... 

Gaurav sharma:
20150719 13:31:33
easy one :) century completed :P 

vipul sharma:
20150716 19:24:16
sort


Akshat Mathur:
20150708 18:58:05
AC in one go :)


SRC:
20150616 10:25:30
Getting a wrong answer in 35th running, can someone provide some tricky test cases? 
Added by:  Fidel Schaposnik 
Date:  20131007 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 
Resource:  Argentinian Programming Tournament 2013 