Index Problem Difficulty Solved 1 Lunar New Year and Number Division 1000 2 Bad Sequence 1200 3 Bracket Subsequence 1200 4 Dishonest Sellers 1200 5 Birthday 1200 6 Dividing the numbers 1300 7 Postcard 1300 8 Substring Game in the Lesson 1300 9 Labs 1300 10 Seat Arrangements 1300 11 Table Tennis Game 2 1300 12 Ehab and a Special Coloring Problem 1300 13 Phone Numbers 1400 14 Servers 1400 15 Constanze's Machine 1400 16 Candies! 1400 17 Queen 1400 18 Three displays 1400 19 Connect 1400 20 Ehab and a 2-operation task 1400 21 Maximum Median 1400 22 Sonya and Robots 1400 23 Everyone is a Winner! 1400 24 Journey 1500 25 Edgy Trees 1500 26 Vladik and fractions 1500 27 Coffee Break 1500 28 The Fair Nut and String 1500 29 Ayoub and Lost Array 1500 30 Sagheer and Nubian Market 1500 31 Solution for Cube 1500 32 Phone Numbers 1500 33 Mahmoud and Ehab and the wrong algorithm 1500 34 Candies 1500 35 Cut 'em all! 1500 36 Round Corridor 1500 37 Swap Letters 1500 38 Sweets Eating 1500 39 Sequence Transformation 1500 40 A Tale of Two Lands 1600 41 Primes and Multiplication 1600 42 Tram 1600 43 Jury Marks 1600 44 Okabe and Boxes 1600 45 Serval and Parenthesis Sequence 1600 46 Rectangles 1600 47 Plasticine zebra 1600 48 Cave Painting 1600 49 League of Leesins 1600 50 Paint the Digits 1600 51 Kuro and Walking Route 1600 52 The Phone Number 1600 53 Convenient For Everybody 1600 54 Hacker, pack your bags! 1600 55 Maximum Subrectangle 1600 56 Anton and Fairy Tale 1600 57 Jamie and Interesting Graph 1600 58 Banh-mi 1600 59 Alyona and Spreadsheet 1600 60 An impassioned circulation of affection 1600 61 Dasha and Password 1600 62 Masha and two friends 1600 63 Fifa and Fafa 1700 64 Subsequence Counting 1700 65 Fountains 1700 66 Mike and gcd problem 1700 67 Creative Snap 1700 68 Trailing Loves (or L'oeufs?) 1700 69 Remove Extra One 1700 70 Array Product 1700 71 Problem for Nazar 1700 72 Posterized 1700 73 Laboratory Work 1700 74 Beautiful Lyrics 1700 75 Multiplicity 1700 76 Anna, Svyatoslav and Maps 1700 77 Magic Grid 1800 78 Naming Company 1800 79 Petya and Exam 1800 80 Mahmoud and Ehab and the xor 1800 81 Neko does Maths 1800 82 Travelling Salesman and Special Numbers 1800 83 Vladik and Memorable Trip 1800 84 Molly's Chemicals 1800 85 A Mist of Florescence 1800 86 Vus the Cossack and Strings 1800 87 Jon Snow and his Favourite Number 1800 88 Marco and GCD Sequence 1800 89 Greedy Arkady 1900 90 Flag 1900 91 System Testing 1900 92 The Football Season 1900 93 Felicity is Coming! 1900 94 Square Subsets 2000 95 Ilya And The Tree 2000 96 Garland 2000 97 Sad powers 2100 98 Vladik and chat 2200 99 Strange Radiation 2500 100 Perun, Ult! 2500