EXTRA EX-11
Rating ≥ 2200 (Extra)
Extra problems for experienced users or users with Codeforces Rating >= 2200 (Extra).
LEVEL Master+
PROBLEMS 200
PROGRESS
Your Statistics
SOLVED
COMPLETION 0 / 200
PROBLEM SET
All Problems
SHOW/HIDE
RATING RANGE
—
SORT BY RATING
FILTER BY TAG
| # | PROBLEM | RATING | DIFFICULTY | TAGS | STATUS |
|---|---|---|---|---|---|
| 01 | Bus to Udayland | LVL 1 | brute forceimplementation | | |
| 02 | LLPS | LVL 1 | binary searchbitmasksbrute force +3 | | |
| 03 | Playing with Dice | LVL 1 | brute force | | |
| 04 | Taymyr is calling you | LVL 1 | brute forceimplementationmath | | |
| 05 | Summer Camp | LVL 1 | implementation | | |
| 06 | Soldier and Bananas | LVL 1 | brute forceimplementationmath | | |
| 07 | Wizards' Duel | LVL 1 | implementationmath | | |
| 08 | Opponents | LVL 1 | implementation | | |
| 09 | Free Ice Cream | LVL 1 | constructive algorithmsimplementation | | |
| 10 | Drazil and Date | LVL 2 | math | | |
| 11 | Arpa’s hard exam and Mehrdad’s naive cheat | LVL 2 | implementationmathnumber theory | | |
| 12 | Multiplication Table | LVL 2 | implementationnumber theory | | |
| 13 | Kefa and First Steps | LVL 2 | brute forcedpimplementation | | |
| 14 | Lecture | LVL 2 | implementationstrings | | |
| 15 | Nicholas and Permutation | LVL 2 | constructive algorithmsimplementation | | |
| 16 | Pasha and Stick | LVL 2 | combinatoricsmath | | |
| 17 | Different is Good | LVL 2 | constructive algorithmsimplementationstrings | | |
| 18 | Uncowed Forces | LVL 2 | implementation | | |
| 19 | Case of the Zeros and Ones | LVL 2 | greedy | | |
| 20 | Saitama Destroys Hotel | LVL 2 | implementationmath | | |
| 21 | Tavas and Nafas | LVL 2 | brute forceimplementation | | |
| 22 | Bear and Five Cards | LVL 2 | constructive algorithmsimplementation | | |
| 23 | Bear and Finding Criminals | LVL 2 | constructive algorithmsimplementation | | |
| 24 | Calculating Function | LVL 2 | implementationmath | | |
| 25 | Lovely Palindromes | LVL 2 | constructive algorithmsmath | | |
| 26 | Joysticks | LVL 2 | dpgreedyimplementation +1 | | |
| 27 | Timofey and cubes | LVL 2 | constructive algorithmsimplementation | | |
| 28 | Complicated GCD | LVL 2 | mathnumber theory | | |
| 29 | Two Bases | LVL 3 | brute forceimplementation | | |
| 30 | Rebranding | LVL 3 | implementationstrings | | |
| 31 | Semifinals | LVL 3 | implementationsortings | | |
| 32 | Median Smoothing | LVL 3 | implementation | | |
| 33 | Digital Counter | LVL 3 | implementation | | |
| 34 | Tavas and SaDDas | LVL 3 | bitmasksbrute forcecombinatorics +1 | | |
| 35 | Little Robber Girl's Zoo | LVL 3 | constructive algorithmsimplementationsortings | | |
| 36 | Alternative Thinking | LVL 3 | dpgreedymath | | |
| 37 | Misha and Changing Handles | LVL 3 | data structuresdsustrings | | |
| 38 | Valuable Resources | LVL 3 | brute forcegreedy | | |
| 39 | Beautiful Paintings | LVL 3 | greedysortings | | |
| 40 | World Tour | LVL 4 | graphsshortest paths | | |
| 41 | Arpa’s obvious problem and Mehrdad’s terrible solution | LVL 4 | brute forcemathnumber theory | | |
| 42 | Berzerk | LVL 4 | dfs and similardpgames | | |
| 43 | Tennis Championship | LVL 4 | combinatoricsconstructive algorithmsgreedy +1 | | |
| 44 | Watering Flowers | LVL 4 | implementation | | |
| 45 | Approximating a Constant Range | LVL 4 | dpimplementationtwo pointers | | |
| 46 | OR in Matrix | LVL 4 | greedyhashingimplementation | | |
| 47 | Game of Credit Cards | LVL 4 | data structuresdpgreedy +1 | | |
| 48 | Day at the Beach | LVL 4 | sortings | | |
| 49 | Report | LVL 4 | data structuressortings | | |
| 50 | Guest From the Past | LVL 4 | implementationmath | | |
| 51 | Modular Equations | LVL 4 | mathnumber theory | | |
| 52 | Tavas and Karafs | LVL 4 | binary searchgreedymath | | |
| 53 | Hamming Distance Sum | LVL 4 | combinatoricsstrings | | |
| 54 | Misha and Permutations Summation | LVL 4 | data structures | | |
| 55 | Mike and Fun | LVL 4 | brute forcedpgreedy +1 | | |
| 56 | Harmony Analysis | LVL 4 | constructive algorithms | | |
| 57 | Vasya and Wrestling | LVL 4 | implementation | | |
| 58 | Alyona and a tree | LVL 4 | binary searchdata structuresdfs and similar +2 | | |
| 59 | More Cowbell | LVL 4 | binary searchgreedy | | |
| 60 | Logo Turtle | LVL 4 | dp | | |
| 61 | Moodular Arithmetic | LVL 4 | combinatoricsdfs and similardsu +2 | | |
| 62 | Taxes | LVL 4 | mathnumber theory | | |
| 63 | Recycling Bottles | LVL 4 | dpgeometrygreedy +1 | | |
| 64 | Gena's Code | LVL 4 | implementationmath | | |
| 65 | Image Preview | LVL 4 | binary searchbrute forcedp +1 | | |
| 66 | Symmetric and Transitive | LVL 4 | combinatoricsdpmath | | |
| 67 | Lipshitz Sequence | LVL 4 | data structuresmath | | |
| 68 | Chip 'n Dale Rescue Rangers | LVL 4 | binary searchgeometrymath | | |
| 69 | Candy Boxes | LVL 5 | brute forceconstructive algorithmsmath | | |
| 70 | Legacy | LVL 5 | data structuresgraphsshortest paths | | |
| 71 | Bamboo Partition | LVL 5 | brute forcedata structuresimplementation +4 | | |
| 72 | Running Track | LVL 5 | dpgreedystrings +1 | | |
| 73 | Kleofáš and the n-thlon | LVL 5 | dpmathprobabilities | | |
| 74 | Mushroom Gnomes - 2 | LVL 5 | binary searchdata structuresprobabilities +1 | | |
| 75 | Hanoi Factory | LVL 5 | brute forcedata structuresdp +2 | | |
| 76 | Last Chance | LVL 5 | data structuresimplementationstrings | | |
| 77 | Anton and Ira | LVL 5 | constructive algorithmsgreedymath | | |
| 78 | Build String | LVL 5 | flowsgraphs | | |
| 79 | Vladik and cards | LVL 5 | binary searchbitmasksbrute force +1 | | |
| 80 | Decoding Genome | LVL 5 | dpmatrices | | |
| 81 | Inna and Binary Logic | LVL 5 | binary searchbitmasksdata structures | | |
| 82 | Happy Tree Party | LVL 5 | data structuresdfs and similargraphs +2 | | |
| 83 | Anton and Permutation | LVL 5 | brute forcedata structures | | |
| 84 | Little Elephant and LCM | LVL 5 | binary searchcombinatoricsdp +1 | | |
| 85 | Spongebob and Squares | LVL 5 | brute forcemath | | |
| 86 | Money Transfers | LVL 5 | constructive algorithmsdata structuresgreedy +1 | | |
| 87 | Strictly Positive Matrix | LVL 5 | graphsmath | | |
| 88 | Minimization | LVL 5 | dpgreedysortings | | |
| 89 | Random Task | LVL 5 | binary searchbitmaskscombinatorics +2 | | |
| 90 | Let's Play Osu! | LVL 5 | dpmathprobabilities | | |
| 91 | Palindromes | LVL 5 | dpstrings | | |
| 92 | Messenger | LVL 5 | data structureshashingimplementation +2 | | |
| 93 | Hongcow Buys a Deck of Cards | LVL 5 | bitmasksbrute forcedp | | |
| 94 | Love Triangles | LVL 5 | dfs and similardsugraphs | | |
| 95 | Pluses everywhere | LVL 5 | combinatoricsdpmath +1 | | |
| 96 | Paths and Trees | LVL 5 | graphsgreedyshortest paths | | |
| 97 | Lengthening Sticks | LVL 5 | combinatoricsimplementationmath | | |
| 98 | Sonya and Problem Wihtout a Legend | LVL 5 | dpsortings | | |
| 99 | Till I Collapse | LVL 5 | data structuresdivide and conquer | | |
| 100 | Cipher | LVL 5 | combinatoricsdp | | |
| 101 | Apple Tree | LVL 5 | dfs and similarnumber theorytrees | | |
| 102 | Flawed Flow | LVL 5 | constructive algorithmsflowsgraphs +1 | | |
| 103 | Complete The Graph | LVL 5 | binary searchconstructive algorithmsgraphs +1 | | |
| 104 | Superior Periodic Subarrays | LVL 5 | number theory | | |
| 105 | Lieges of Legendre | LVL 5 | gamesmath | | |
| 106 | Bear and Square Grid | LVL 5 | dfs and similardsuimplementation | | |
| 107 | Bear and Tower of Cubes | LVL 5 | binary searchdpgreedy | | |
| 108 | Invariance of Tree | LVL 5 | constructive algorithmsdfs and similargreedy +1 | | |
| 109 | Points on Plane | LVL 5 | constructive algorithmsdivide and conquergeometry +2 | | |
| 110 | ZS and The Birthday Paradox | LVL 6 | mathnumber theoryprobabilities | | |
| 111 | Bear in the Field | LVL 6 | mathmatrices | | |
| 112 | Famil Door and Roads | LVL 6 | combinatoricsdata structuresdfs and similar +3 | | |
| 113 | Break Up | LVL 6 | dfs and similargraphs | | |
| 114 | Devu and Flowers | LVL 6 | bitmaskscombinatoricsnumber theory | | |
| 115 | Alyona and towers | LVL 6 | data structures | | |
| 116 | Find a car | LVL 6 | combinatoricsdivide and conquerdp | | |
| 117 | Bear and Floodlight | LVL 6 | bitmasksdpgeometry | | |
| 118 | Ostap and Tree | LVL 6 | dptrees | | |
| 119 | Strange Calculation and Cats | LVL 6 | dpmatrices | | |
| 120 | Change-free | LVL 6 | greedy | | |
| 121 | Graph Cutting | LVL 6 | dfs and similargraphs | | |
| 122 | Vanya and Balloons | LVL 6 | binary searchbrute forcedp +1 | | |
| 123 | Anya and Cubes | LVL 6 | binary searchbitmasksbrute force +3 | | |
| 124 | Game on Tree | LVL 6 | implementationmathprobabilities +1 | | |
| 125 | Bear and Drawing | LVL 6 | constructive algorithmsdfs and similartrees | | |
| 126 | The Last Fight Between Human and AI | LVL 6 | math | | |
| 127 | Trains and Statistic | LVL 6 | data structuresdpgreedy | | |
| 128 | Inversions After Shuffle | LVL 6 | data structuresprobabilities | | |
| 129 | Marbles | LVL 6 | hashingstrings | | |
| 130 | Acyclic Organic Compounds | LVL 6 | data structuresdfs and similardsu +3 | | |
| 131 | Peterson Polyglot | LVL 6 | brute forcedfs and similardsu +3 | | |
| 132 | Power Tree | LVL 6 | data structurestrees | | |
| 133 | Codeword | LVL 6 | combinatoricsstrings | | |
| 134 | Wilbur and Strings | LVL 7 | dfs and similardpgraphs +1 | | |
| 135 | Iahub and Xors | LVL 7 | data structures | | |
| 136 | Sandy and Nuts | LVL 7 | bitmasksdptrees | | |
| 137 | Dima and Figure | LVL 7 | dp | | |
| 138 | Maximum Waterfall | LVL 7 | data structuresdpgraphs +1 | | |
| 139 | String | LVL 7 | string suffix structures | | |
| 140 | Animals and Puzzle | LVL 7 | binary searchdata structures | | |
| 141 | Splitting the Uniqueness | LVL 7 | constructive algorithms | | |
| 142 | Levko and Strings | LVL 7 | combinatoricsdp | | |
| 143 | Max and Bike | LVL 7 | binary searchgeometry | | |
| 144 | Yaroslav and Points | LVL 7 | data structures | | |
| 145 | Anniversary | LVL 7 | data structuresimplementationmath +2 | | |
| 146 | Ultimate Weirdness of an Array | LVL 7 | data structuresnumber theory | | |
| 147 | Sereja and Sets | LVL 7 | dp | | |
| 148 | Permutations | LVL 7 | mathmatrices | | |
| 149 | Curious Array | LVL 7 | brute forcecombinatoricsimplementation +1 | | |
| 150 | Little Elephant and Tree | LVL 7 | data structuresdfs and similartrees | | |
| 151 | Parquet Re-laying | LVL 7 | constructive algorithms | | |
| 152 | Timofey and remoduling | LVL 7 | brute forceimplementationmath +1 | | |
| 153 | Misha and Palindrome Degree | LVL 7 | binary searchcombinatoricsimplementation | | |
| 154 | Kefa and Watch | LVL 7 | data structureshashingstrings | | |
| 155 | Arpa’s overnight party and Mehrdad’s silent entering | LVL 7 | constructive algorithmsdfs and similargraphs | | |
| 156 | Timofey and our friends animals | LVL 7 | data structuresdivide and conquerdsu | | |
| 157 | Digit Tree | LVL 7 | dfs and similardivide and conquerdsu +1 | | |
| 158 | Product Sum | LVL 7 | data structuresdpgeometry | | |
| 159 | Choosing Subtree is Fun | LVL 8 | binary searchdata structuresdfs and similar +2 | | |
| 160 | Cyclical Quest | LVL 8 | data structuresstring suffix structuresstrings | | |
| 161 | Sereja and Intervals | LVL 8 | combinatoricsdp | | |
| 162 | Hamming Triples | LVL 8 | implementationmathtwo pointers | | |
| 163 | Fox And Polygon | LVL 8 | constructive algorithmsdivide and conquer | | |
| 164 | Black Widow | LVL 8 | dpgraphsimplementation +1 | | |
| 165 | Maxim and Increasing Subsequence | LVL 8 | dp | | |
| 166 | Vasya and Polynomial | LVL 8 | math | | |
| 167 | Gosha is hunting | LVL 8 | brute forcedata structuresdp +4 | | |
| 168 | Bear and Chase | LVL 8 | brute forcedfs and similargraphs +3 | | |
| 169 | Fetch the Treasure | LVL 8 | brute forcedata structuresgraphs +1 | | |
| 170 | Jeff and Removing Periods | LVL 8 | data structures | | |
| 171 | Random Function and Tree | LVL 8 | combinatoricsdptrees | | |
| 172 | Timofey and a flat tree | LVL 8 | data structuresgraphshashing +2 | | |
| 173 | World of Darkraft - 2 | LVL 8 | dpprobabilities | | |
| 174 | Drazil and Morning Exercise | LVL 8 | dfs and similardpdsu +2 | | |
| 175 | Boolean Function | LVL 8 | bitmasksdpexpression parsing | | |
| 176 | Misha and XOR | LVL 8 | bitmasks | | |
| 177 | Randomizer | LVL 8 | combinatoricsgeometryprobabilities | | |
| 178 | Roads in Yusland | LVL 8 | data structuresdpgreedy | | |
| 179 | Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths | LVL 8 | data structuresdfs and similartrees | | |
| 180 | New Language | LVL 8 | 2-satgreedy | | |
| 181 | Flights for Regular Customers | LVL 8 | dpmatrices | | |
| 182 | Cow Tennis Tournament | LVL 9 | combinatoricsdata structuresmath | | |
| 183 | Fence | LVL 9 | binary searchdata structuresstring suffix structures | | |
| 184 | Maxim and Calculator | LVL 9 | brute forcedptwo pointers | | |
| 185 | Bear and Bowling | LVL 9 | data structuresgreedy | | |
| 186 | Bear and Cavalry | LVL 9 | data structuresdivide and conquerdp | | |
| 187 | Pastoral Oddities | LVL 9 | data structuresdivide and conquerdsu +2 | | |
| 188 | k-Maximum Subsequence Sum | LVL 9 | data structuresflowsgraphs +1 | | |
| 189 | Little Pony and Elements of Harmony | LVL 9 | dpmatrices | | |
| 190 | Parking Lot | LVL 9 | data structuresdivide and conquer | | |
| 191 | Quick Tortoise | LVL 9 | bitmasksdivide and conquerdp | | |
| 192 | Little Pony and Lord Tirek | LVL 9 | data structures | | |
| 193 | Ladies' Shop | LVL 9 | constructive algorithmsfftmath | | |
| 194 | Clockwork Bomb | LVL 9 | data structuresdfs and similardsu +2 | | |
| 195 | Campus | LVL 9 | binary searchdata structuresdsu +1 | | |
| 196 | Points and Segments | LVL 9 | graphs | | |
| 197 | Mirror Room | LVL 10 | data structuresimplementation | | |
| 198 | Listening to Music | LVL 10 | constructive algorithmsdata structures | | |
| 199 | Pumping Stations | LVL 10 | brute forcedfs and similardivide and conquer +4 | | |
| 200 | k-d-sequence | LVL 10 | data structures | |
ANALYTICS
Quick Stats
≤ GRANDMASTER
145
PROBLEMS INT. GRANDMASTER
41
PROBLEMS LEGENDARY GM
14
PROBLEMS ≥ LEGENDARY GM
14
PROBLEMS