Index Problem Difficulty Solved 1 Keyboard Layouts 800 2 Decoding 900 3 Watering System 1000 4 Mislove Has Lost an Array 1000 5 3-palindrome 1000 6 Ania and Minimizing 1000 7 Timofey and cubes 1000 8 Fafa and the Gates 1000 9 Buying a TV Set 1100 10 Badges 1100 11 Nauuo and Chess 1100 12 The Festive Evening 1100 13 Non-Coprime Partition 1100 14 Minesweeper 1100 15 Weird Rounding 1100 16 Perfect Number 1100 17 Sport Mafia 1100 18 Pair of Toys 1100 19 Hamster Farm 1100 20 Mahmoud and a Triangle 1100 21 Polycarp and Letters 1100 22 Chocolates 1100 23 The Eternal Immortality 1100 24 Getting an A 1100 25 Crossword solving 1100 26 Serval and Toy Bricks 1200 27 A Prosperous Lot 1200 28 Email from Polycarp 1200 29 Ehab Is an Odd Person 1200 30 Blown Garland 1200 31 Godsend 1200 32 Planning The Expedition 1200 33 LCM 1200 34 Mancala 1200 35 High School: Become Human 1200 36 Cutting 1200 37 Chloe and the sequence 1200 38 Wrath 1200 39 Kvass and the Fair Nut 1200 40 Draw! 1300 41 Filling the Grid 1300 42 Mahmoud and Ehab and the message 1300 43 Messages 1300 44 Summer sell-off 1300 45 Rectangles 1300 46 Months and Years 1300 47 Forgery 1300 48 A Tide of Riverscape 1300 49 Cutting Carrot 1300 50 Segments 1300 51 Beautiful Numbers 1300 52 Mike and strings 1300 53 Position in Fraction 1300 54 World Cup 1300 55 Cubes for Masha 1300 56 Divisiblity of Differences 1300 57 Magic Forest 1300 58 Chtholly's request 1300 59 An express train to reveries 1300 60 Parallelogram is Back 1300 61 Dasha and friends 1300 62 Build a Contest 1300 63 Table Tennis 1300 64 Koala and Lights 1300 65 Battleship 1300 66 Game of Credit Cards 1300 67 Mister B and Angle in Polygon 1300 68 Tic-Tac-Toe 1400 69 T-shirt buying 1400 70 Not simply beatiful strings 1400 71 Hongcow Solves A Puzzle 1400 72 Sonya and Exhibition 1400 73 Alice and the List of Presents 1400 74 Karen and Coffee 1400 75 Double Matrix 1400 76 Silly Mistake 1400 77 Bash's Big Day 1400 78 PIN Codes 1400 79 Uniqueness 1500 80 Yet Another Array Partitioning Task 1500 81 Azamon Web Services 1500 82 The Number of Products 1500 83 Nikita and string 1500 84 Modulo Equality 1500 85 Vile Grasshoppers 1500 86 Frodo and pillows 1500 87 Lunar New Year and Food Ordering 1500 88 Zero Array 1500 89 Minimize the error 1500 90 Tell Your World 1600 91 Sagheer, the Hausmeister 1600 92 Petya and Exam 1600 93 Math 1600 94 Code For 1 1600 95 Marlin 1600 96 Dima and a Bad XOR 1600 97 Masha and geometric depression 1700 98 Jamie and Binary Sequence (changed after round) 1700 99 Circus 1700 100 Ralph And His Magic Field 1800