Need help in problems from Team Selection Competition in Serbia

Правка en4, от Vasiljko, 2018-04-28 16:45:29

I'm preparing for Team Selection Competition and these are some problems that I want to know how to solve. Problems are from previous competitions

Problem 1
Problem 2
Problem 3
Problem 4

There are a lot of problems that I can't solve but these are the ones that I think are kinda easier

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en9 Английский Vasiljko 2018-04-28 17:20:43 96 Tiny change: '$N<=10^18$\nEdit: $b' -> '$N<=10^18$ \nEdit: $b'
en8 Английский Vasiljko 2018-04-28 16:49:28 134
en7 Английский Vasiljko 2018-04-28 16:48:47 33 Tiny change: 'nda easier\n' -> 'nda easier (Not easier, but most intersted)\n'
en6 Английский Vasiljko 2018-04-28 16:46:51 2 Tiny change: 's : $A=$(A+$biggestD' -> 's : $A=$($A$+$biggestD'
en5 Английский Vasiljko 2018-04-28 16:46:11 3 Tiny change: 'perform these operation' -> 'perform this operation'
en4 Английский Vasiljko 2018-04-28 16:45:29 2 Tiny change: 'lems are form previous' -> 'lems are from previous'
en3 Английский Vasiljko 2018-04-28 16:45:07 105
en2 Английский Vasiljko 2018-04-28 16:42:58 731 Tiny change: ' : $ A=(A+biggestDigit(A))%M $. ' -> ' : $ A=(A+(A))%M $. ' (published)
en1 Английский Vasiljko 2018-04-28 16:27:11 375 Initial revision (saved to drafts)