Problemset - Codeforces

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Codeforces Round (Div. 2)
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combinatorics

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Problems

#	Name
2276G	Elimination of Players combinatorics, dp, math		x132
2276E	Good Substrings combinatorics, data structures, data structures, dp, greedy, greedy, strings		x2374
2276D	Caveman combinatorics, graphs		x5762
2275H	A Problem to Warm Up the Eyebrows combinatorics, combinatorics, dp, dp, math, math		x555
2267E	Clean Substrings combinatorics, data structures, math	2000	x2012
2264E2	A Prime Flood (Hard Version) brute force, combinatorics, combinatorics, combinatorics, dp, dp, number theory, number theory	2700	x461
2264E1	A Prime Flood (Easy Version) combinatorics, dp, number theory	2200	x1384
2264C	Madamant's Skating Dynasty combinatorics, math, sortings	1400	x7416
2262E	Paired Bracket Sequences combinatorics, math	3100	x223
2262C	Traveling the World combinatorics, constructive algorithms, graphs, greedy, math	2300	x1023
2260G	Sortable Permutations brute force, combinatorics, math, number theory	2900	x251
2255B	A Ribbon for Tomorrow combinatorics, math	1600	x7586
2252E	Generational Triplets bitmasks, combinatorics, dp, math	2100	x2078
2249B	Permutation Cuts combinatorics, implementation, math	1700	x4689
2246C	0mar and Alternating Sums combinatorics, dp, math	1400	x9623
2245F	Familiar? brute force, combinatorics, dp	2800	x467
2241E	Fair and Square combinatorics, dp, graphs, math, number theory, trees	1600	x6967
2240B	AI Finds Nothing Here combinatorics, math	1100	x11487
2239D	Hunting the Beast combinatorics, dp, graphs, math	2500	x735
2238F	Infinite Work combinatorics, graphs, greedy, math, trees	2600	x509
2236F2	Elections in Saransk (hard version) combinatorics, dp, dp, dp, math, number theory	2200	x1286
2234E	Vlad, Misha and Two Arrays brute force, combinatorics, dfs and similar, divide and conquer, math	2100	x2240
2233E2	Permutation Transmission (Difficult Version) bitmasks, combinatorics, sortings	2300	x1398
2233E1	Permutation Transmission (Easy Version) bitmasks, combinatorics, sortings	2300	x1317
2232E	Snaking Arrangement combinatorics, combinatorics, combinatorics, constructive algorithms	2600	x661
2229H	Wowee Binary String combinatorics, dp, strings	3300	x300
2229E	Deconstruction Tree combinatorics, data structures, dp, graphs, trees	2100	x2123
2228E2	Amanojaku and Sequence (Hard Version) combinatorics, data structures, implementation, math	2500	x397
2228E1	Amanojaku and Sequence (Easy Version) combinatorics, math	2400	x681
2222H	Counting Sort? brute force, combinatorics, dp	3500	x165
2217G	Down the Pivot combinatorics, dp, math, trees	2600	x477
2217F	Interval Game bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities	2400	x969
2211F	Learning Binary Search combinatorics, divide and conquer, dp, math	2400	x1082
2211D	AND-array bitmasks, combinatorics, math	1900	x3508
2208E	Counting Cute Arrays combinatorics, dp	2700	x505
2207E2	N-MEX (Counting Version) combinatorics, constructive algorithms, math	2400	x1028
2206I	Growth Factor combinatorics, dp, math, number theory	2900	x247
2205E	Simons and Dividing the Rhythm combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings	2100	x1967
2204F	Sum of Fractions binary search, brute force, combinatorics, data structures, greedy, math, number theory, two pointers	2200	x1403
2201C	Rigged Bracket Sequence combinatorics, dp, greedy	2000	x2326
2200G	Operation Permutation combinatorics, dp, math, probabilities	2200	x1359
2199H	Sum of MEX *special problem, combinatorics, data structures, dp, math	2300	x121
2199F	Self-Produced Sequences *special problem, combinatorics, math	2000	x195
2196C2	Interactive Graph (Hard Version) combinatorics, dfs and similar, dp, graphs, interactive	2000	x2871
2196C1	Interactive Graph (Simple Version) binary search, combinatorics, dfs and similar, dp, graphs, interactive	1800	x4052
2190E	Median Permutation combinatorics	3200	x275
2190D	Prufer Vertex combinatorics, dsu, number theory, probabilities, trees	2500	x1053
2190B1	Sub-RBS (Easy Version) combinatorics, constructive algorithms, dp, greedy, strings, two pointers	1400	x11898
2189D2	Little String (Hard Version) combinatorics, dp, greedy, math, number theory	2200	x2137
2189D1	Little String (Easy Version) combinatorics, dp, greedy, math, number theory	1900	x4376
2184E	Exquisite Array combinatorics, data structures, dsu, sortings	1800	x6500
2184D	Unfair Game combinatorics, dp, math	1600	x10689
2183F	Jumping Man brute force, combinatorics, dfs and similar, dp, trees	2500	x1324
2183D2	Tree Coloring (Hard Version) combinatorics, constructive algorithms, data structures, dfs and similar, greedy, implementation, trees	2100	x2661
2182G	Short Garland combinatorics, data structures, dfs and similar, dp, trees	2800	x411
2182F2	Christmas Reindeer (hard version) bitmasks, brute force, combinatorics, data structures, greedy, math	2500	x1194
2182F1	Christmas Reindeer (easy version) bitmasks, brute force, combinatorics, dp, math	2300	x1383
2182D	Christmas Tree Decoration combinatorics, dp, greedy, math	1600	x9780
2182C	Production of Snowmen brute force, combinatorics, dp	1200	x16819
2180G	Balance bitmasks, combinatorics, implementation, math	3500	x161
2180F2	Control Car (Hard Version) combinatorics, dp, matrices, probabilities	3200	x256
2180F1	Control Car (Easy Version) combinatorics, dp, probabilities	2800	x446
2178I	Numbers or Fireworks bitmasks, combinatorics, dp, graphs	3300	x276
2178F	Conquer or of Forest combinatorics, math, trees	2200	x1911
2176F	Omega Numbers bitmasks, combinatorics, dp, math, number theory	2400	x1622
2174F	Mosaic Tree combinatorics, dp, fft, math, trees	2800	x525
2174C2	Beautiful Patterns (Hard Version) combinatorics, math, probabilities	2500	x1153
2174C1	Beautiful Patterns (Easy Version) combinatorics, math, probabilities	2400	x1299
2172D	Divisor Card Game combinatorics, dp	3100	x143
2171G	Sakura Adachi and Optimal Sequences bitmasks, combinatorics, greedy, math	2000	x2575
2170E	Binary Strings and Blocks combinatorics, data structures, dp	2100	x2536
2169F	Subsequence Problem combinatorics, dp, fft, math	2800	x366
2168B	Locate binary search, combinatorics, communication, constructive algorithms, greedy, interactive		x1677
2164F2	Chain Prefix Rank (Hard Version) binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees	2900	x944
2164F1	Chain Prefix Rank (Easy Version) combinatorics, dfs and similar, dp, math, trees	2600	x1954
2163E	Plegma bitmasks, combinatorics, communication, interactive	2700	x707
2163C	Monopati brute force, combinatorics, dp, math, two pointers	1500	x9891
2161F	SubMST combinatorics, graphs, trees	3000	x413
2161E	Left is Always Right combinatorics, implementation, math	2400	x835
2159C	Twin Polynomials combinatorics, graph matchings, math	2300	x3563
2158F2	Distinct GCDs (Hard Version) combinatorics, constructive algorithms, graphs, math, number theory, number theory	3000	x327
2157H	Keygen 3 brute force, combinatorics, constructive algorithms, dfs and similar, math	3300	x571
2154F2	Bombing (Hard Version) combinatorics, dp	3300	x233
2154F1	Bombing (Easy Version) brute force, combinatorics, constructive algorithms, implementation, math	2700	x619
2150G	Counting Is Fun: The Finale combinatorics, implementation	3500	x455
2150D	Attraction Theory combinatorics, dp, math	2700	x1405
2150B	Grid Counting combinatorics, implementation, math	1700	x8563
2147G	Modular Tetration combinatorics, math, number theory	3100	x1317
2147F	Exchange Queries combinatorics, data structures, greedy	2800	x1751
2146F	Bubble Sort brute force, combinatorics, dp	2900	x358
2145G	Cost of Coloring combinatorics, divide and conquer, dp, fft, math	2900	x656
2144E2	Looking at Towers (difficult version) combinatorics, data structures, dp	2500	x1634
2144E1	Looking at Towers (easy version) combinatorics, dp	2200	x2894
2144C	Non-Descending Arrays combinatorics, dp, math	1300	x16118
2143D2	Inversion Graph Coloring (Hard Version) binary search, combinatorics, data structures, dp, two pointers	2200	x3087
2143D1	Inversion Graph Coloring (Easy Version) combinatorics, data structures, dp, greedy, two pointers	1800	x6967
2140E2	Prime Gaming (Hard Version) bitmasks, combinatorics, dp, probabilities	2500	x1318
2140E1	Prime Gaming (Easy Version) bitmasks, combinatorics, dp	2200	x2286
2138D	Antiamuny and Slider Movement brute force, combinatorics, implementation, math, sortings	2600	x694
2137F	Prefix Maximum Invariance binary search, combinatorics, data structures, sortings	1900	x4289

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