| 1986E | Beautiful Array | | | 1700 | 11.1k |
| 1986F | Non-academic Problem | | | 1900 | 6.7k |
| 1986G1 | Permutation Problem (Simple Version) | | | 2200 | 2k |
| 1986G2 | Permutation Problem (Hard Version) | | | 2500 | 1.5k |
| 1985A | Creating Words | | | 800 | 74.2k |
| 1985B | Maximum Multiple Sum | | | 800 | 57.8k |
| 1985C | Good Prefixes | | | 1000 | 41k |
| 1985D | Manhattan Circle | | | 900 | 42.1k |
| 1985E | Secret Box | | | 1200 | 23.9k |
| 1985F | Final Boss | | | 1500 | 20.5k |
| 1985G | D-Function | | | 1600 | 12.5k |
| 1985H1 | Maximize the Largest Component (Easy Version) | | | 1700 | 7.4k |
| 1985H2 | Maximize the Largest Component (Hard Version) | | | 2200 | 2k |
| 1984A | Strange Splitting | | | 800 | 23k |
| 1984B | Large Addition | | | 1100 | 21.2k |
| 1984C1 | Magnitude (Easy Version) | | | 1300 | 20.6k |
| 1984C2 | Magnitude (Hard Version) | | | 1700 | 8.8k |
| 1984D | ''a'' String Problem | | | 2000 | 4k |
| 1984E | Shuffle | | | 2400 | 1.9k |
| 1984F | Reconstruction | | | 2500 | 1.2k |
| 1984G | Magic Trick II | | | 3200 | 305 |
| 1984H | Tower Capturing | | | 3300 | 281 |
| 1983A | Array Divisibility | | | 800 | 28.3k |
| 1983B | Corner Twist | | | 1200 | 18.6k |
| 1983C | Have Your Cake and Eat It Too | | | 1400 | 14.9k |
| 1983D | Swap Dilemma | | | 1700 | 11.5k |
| 1983E | I Love Balls | | | 2300 | 2.5k |
| 1983F | array-value | | | 2500 | 1.6k |
| 1983G | Your Loss | | | 3000 | 325 |
| 1982A | Soccer | | | 800 | 27.7k |
| 1982B | Collatz Conjecture | | | 1200 | 20k |
| 1982C | Boring Day | | | 1200 | 22.3k |
| 1982D | Beauty of the mountains | | | 1700 | 10.2k |
| 1982E | Number of k-good subarrays | | | 2300 | 1.9k |
| 1982F | Sorting Problem Again | | | 2600 | 1.3k |
| 1981A | Turtle and Piggy Are Playing a Game | | | 800 | 24.4k |
| 1981B | Turtle and an Infinite Sequence | | | 1300 | 16.7k |
| 1981C | Turtle and an Incomplete Sequence | | | 1800 | 6.4k |
| 1981D | Turtle and Multiplication | | | 2400 | 2.2k |
| 1981E | Turtle and Intersected Segments | | | 2600 | 1.3k |
| 1981F | Turtle and Paths on a Tree | | | 3000 | 358 |
| 1980A | Problem Generator | | | 800 | 48.2k |
| 1980B | Choosing Cubes | | | 800 | 38.8k |
| 1980C | Sofia and the Lost Operations | | | 1300 | 22k |
| 1980D | GCD-sequence | | | 1400 | 17.7k |
| 1980E | Permutation of Rows and Columns | | | 1600 | 13.3k |
| 1980F1 | Field Division (easy version) | | | 1900 | 4.5k |
| 1980F2 | Field Division (hard version) | | | 2400 | 1.3k |
| 1980G | Yasya and the Mysterious Tree | | | 2300 | 1.8k |
| 1979A | Guess the Maximum | | | 800 | 32k |
| 1979B | XOR Sequences | | | 1000 | 26.8k |
| 1979C | Earning on Bets | | | 1200 | 22.5k |
| 1979D | Fixing a Binary String | | | 1800 | 8k |
| 1979E | Manhattan Triangle | | | 2400 | 1.9k |
| 1979F | Kostyanych's Theorem | | | 2900 | 451 |
| 1978A | Alice and Books | | | 800 | 28.8k |
| 1978B | New Bakery | | | 800 | 25.6k |
| 1978C | Manhattan Permutations | | | 1300 | 18.1k |
| 1978D | Elections | | | 1600 | 13.9k |
| 1978E | Computing Machine | | | 2000 | 4.7k |
| 1978F | Large Graph | | | 2400 | 1.6k |
| 1977A | Little Nikita | | | 800 | 39.7k |
| 1977B | Binary Colouring | | | 1100 | 20.1k |
| 1977C | Nikita and LCM | | | 1900 | 8.2k |
| 1977D | XORificator | | | 2300 | 2.4k |
| 1977E | Tensor | | | 2600 | 952 |
| 1976A | Verify Password | | | 800 | 32.9k |
| 1976B | Increase/Decrease/Copy | | | 1100 | 25.3k |
| 1976C | Job Interview | | | 1600 | 12.6k |
| 1976D | Invertible Bracket Sequences | | | 2000 | 5.9k |
| 1976E | Splittable Permutations | | | 2500 | 1.3k |
| 1976F | Remove Bridges | | | 2800 | 893 |
| 1975A | Bazoka and Mocha's Array | | | 800 | 20.9k |
| 1975B | 378QAQ and Mocha's Array | | | 1000 | 21.3k |
| 1975C | Chamo and Mocha's Array | | | 1200 | 17.4k |
| 1975D | Paint the Tree | | | 1700 | 7.7k |
| 1975E | Chain Queries | | | 2100 | 2.9k |
| 1975F | Set | | | 2600 | 1.1k |
| 1975G | Zimpha Fan Club | | | 3000 | 349 |
| 1975H | 378QAQ and Core | | | 3500 | 221 |
| 1975I | Mind Bloom | | | 3500 | 189 |
| 1974A | Phone Desktop | | | 800 | 38.3k |
| 1974B | Symmetric Encoding | | | 800 | 34.8k |
| 1974C | Beautiful Triple Pairs | | | 1400 | 19.3k |
| 1974D | Ingenuity-2 | | | 1400 | 18k |
| 1974E | Money Buys Happiness | | | 1800 | 11.8k |
| 1974F | Cutting Game | | | 1900 | 4.5k |
| 1974G | Money Buys Less Happiness Now | | | 2000 | 6.2k |
| 1973A | Chess For Three | | | 900 | 29k |
| 1973B | Cat, Fox and the Lonely Array | | | 1300 | 17.1k |
| 1973C | Cat, Fox and Double Maximum | | | 1700 | 10k |
| 1973D | Cat, Fox and Maximum Array Split | | | 2400 | 2.3k |
| 1973E | Cat, Fox and Swaps | | | 2500 | 1k |
| 1973F | Maximum GCD Sum Queries | | | 3100 | 345 |
| 1972A | Contest Proposal | | | 800 | 26.2k |
| 1972B | Coin Games | | | 900 | 25.8k |
| 1971A | My First Sorting Problem | | | 800 | 60.8k |
| 1971B | Different String | | | 800 | 45.5k |
| 1971C | Clock and Strings | | | 900 | 42.4k |
| 1971D | Binary Cut | | | 1100 | 31k |