ABCD - Colours A, B, C, D

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Consider a table with 2 rows and 2N columns (a total of 4N cells). Each cell of the first row is coloured by one of the colours A, B, C, D such that there are no two adjacent cells of the same colour. You have to colour the second row using colours A, B, C, D such that:

• There are exactly N cells of each colour (A, B, C and D) in the table.

• There are no two adjacent cells of the same colour. (Adjacent cells share a vertical or a horizontal side.)

It is guaranteed that the solution, not necessarily unique, will always exist.


[a natural number N ≤ 50000]

[a string of 2N letters from the set {A, B, C, D}, representing the first row of the table]


[a string of 2N letters from the set {A, B, C, D}, representing the second row of the table]













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poojan : 2016-03-09 14:36:18

2 WA ans But Finally Got It Awsome Que! One wa bcs Not terminate string '\0':
Very Good Que! Must do!

enigmus: 2016-02-24 15:19:52

Hint: Try building up your solution from smaller pieces

Ankit: 2016-02-18 17:23:42

My program runs for a O(n) but still it gives Time Limit Exceeded. Stuck badly. !!

Ankit: 2016-02-17 13:13:54

TLE after 18. The numbers in the bracket, any idea what it means ?

minhthai: 2016-01-15 12:53:12

try to think super simply :)

naruto09: 2015-12-16 20:15:07

WA at 18th test case...can anyone help please..?

darkhire21: 2015-10-18 11:00:37

read carefully statement 1 ..!!!!

(Tjandra Satria Gunawan)(曾毅昆): 2015-08-02 04:25:08

Finally AC, it's hard to think the solution but very easy to implement :)

Shubhransh Srivastav: 2015-07-09 17:10:53

wa on running judge 18.... don't know why :(

Last edit: 2015-07-13 19:30:43
Diksha Jaiswal: 2015-06-04 07:37:37

tle with backtracking :(

Added by:Adrian Satja Kurdija
Time limit:0.190s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Resource:inspired by a math puzzle