LITE  Light Switching
Farmer John tries to keep the cows sharp by letting them play with intellectual toys. One of the larger toys is the lights in the barn. Each of the N (2 <= N <= 100,000) cow stalls conveniently numbered 1..N has a colorful light above it.
At the beginning of the evening, all the lights are off. The cows control the lights with a set of N pushbutton switches that toggle the lights; pushing switch i changes the state of light i from off to on or from on to off.
The cows read and execute a list of M (1 <= M <= 100,000) operations expressed as one of two integers (0 <= operation <= 1).
The first kind of operation (denoted by a 0 command) includes two subsequent integers S_i and E_i (1 <= S_i <= E_i <= N) that indicate a starting switch and ending switch. They execute the operation by pushing each pushbutton from S_i through E_i inclusive exactly once.
The second kind of operation (denoted by a 1 command) asks the cows to count how many lights are on in the range given by two integers S_i and E_i (1 <= S_i <= E_i <= N) which specify the inclusive range in which the cows should count the number of lights that are on.
Help FJ ensure the cows are getting the correct answer by processing the list and producing the proper counts.
Input
Line 1: Two spaceseparated integers: N and M
Lines 2..M+1: Each line represents an operation with three spaceseparated integers: operation, S_i, and E_i
Output
Lines 1..number of queries: For each output query, print the count as an integer by itself on a single line.
Example
Input:
4 5
0 1 2
0 2 4
1 2 3
0 2 4
1 1 4
Output:
1
2
hide comments
Ravi:
20150819 20:37:32
first time feeling "lazy" after spending hours on this problem :P 

shivam:
20150814 11:05:42
Being Unlazy! :) 

(Tjandra Satria Gunawan)(æ›¾æ¯…æ˜†):
20150731 05:10:54
this lazy problem make me lazy to optimize (My program is 21th slowest of 1572 accepted users) :p 

Vikrant Singh:
20150728 16:17:13
too many WAs due to wrong lazy update.. too lazy to fix it :P 

Ashwani Gautam:
20150617 21:46:34
sqrt decomposition showing TLE...:(


Abhilash:
20150609 05:22:51
cin/out gives TLE 

Praveen Kulkarni:
20150604 15:17:49
my first attempt at laziness 

ANKIT TAPARIA:
20150531 17:10:45
long long gives TLE... int works fine!!! 

Dhawal Harkawat:
20150526 08:36:54
use scanf/printf or fast I/O instead of cin/cout.. 

i_am_looser:
20150519 22:31:01
lazy and looser hahahaha..... :) 
Added by:  Iqram Mahmud 
Date:  20100903 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: OBJC VB.NET 
Resource:  USACO November 08 