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 Si and Ei (1 ≤ Si ≤ Ei ≤ N) that indicate a starting switch and ending switch. They execute the operation by pushing each pushbutton from Si through Ei 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 Si and Ei (1 ≤ Si ≤ Ei ≤ 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 space-separated integers: N and M
Lines 2 to M+1: Each line represents an operation with three space-separated integers: operation, Si, and Ei
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
bad_bat:
2019-10-05 17:58:02
AC in one go!
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fardin_abir:
2019-09-27 07:34:47
Use scanf,printf.... |
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akshay184:
2019-09-04 22:14:32
Finally accepted |
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akshay184:
2019-09-04 20:52:11
getting wrong answer at 10 th test case |
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landofkings:
2019-07-20 13:17:58
no need of any io read , simple cin , cout gives AC but in 0.56 seconds. |
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saurav_paul:
2019-07-11 21:24:38
Basic Lazy Propagation, NIce problem |
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saurabh8522:
2019-07-10 16:52:35
AC in one go.
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mohit2598:
2019-07-10 16:20:18
Anyone going wrong at 10th test case.. Here is what is happening..
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dkkv0000:
2019-05-14 22:17:24
after 3 hrs AC :) my first lazy propagation |
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amantu_amir:
2019-04-03 23:18:50
AC after trying about a week,,,
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Added by: | Iqram Mahmud |
Date: | 2010-09-03 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: OBJC VB.NET |
Resource: | USACO November 08 |