Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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combinatorics

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Problems

#	Name
2222H	Counting Sort? brute force, combinatorics, dp		x96
2217G	Down the Pivot combinatorics, dp, math, trees	2600	x336
2217F	Interval Game bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities	2300	x682
2211F	Learning Binary Search combinatorics, divide and conquer, dp, math	2400	x905
2211D	AND-array bitmasks, combinatorics, math	1900	x2868
2208E	Counting Cute Arrays combinatorics, dp	2700	x420
2207E2	N-MEX (Counting Version) combinatorics, constructive algorithms, math	2400	x855
2206I	Growth Factor combinatorics, dp, math, number theory	2900	x165
2205E	Simons and Dividing the Rhythm combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings	2100	x1556
2204F	Sum of Fractions binary search, brute force, combinatorics, data structures, greedy, math, number theory, two pointers	2200	x1217
2201C	Rigged Bracket Sequence combinatorics, dp, greedy	2000	x1976
2200G	Operation Permutation combinatorics, dp, math, probabilities	2200	x1018
2199H	Sum of MEX *special problem, combinatorics, data structures, dp, math	2300	x90
2199F	Self-Produced Sequences *special problem, combinatorics, math	2000	x148
2196C2	Interactive Graph (Hard Version) combinatorics, dfs and similar, dp, graphs, interactive	2000	x2509
2196C1	Interactive Graph (Simple Version) binary search, combinatorics, dfs and similar, dp, graphs, interactive	1800	x3575
2190E	Median Permutation combinatorics	3200	x235
2190D	Prufer Vertex combinatorics, dsu, number theory, probabilities, trees	2500	x949
2190B1	Sub-RBS (Easy Version) combinatorics, constructive algorithms, dp, greedy, strings, two pointers	1400	x10642
2189D2	Little String (Hard Version) combinatorics, dp, greedy, math, number theory	2200	x1942
2189D1	Little String (Easy Version) combinatorics, dp, greedy, math, number theory	1900	x3952
2184E	Exquisite Array combinatorics, data structures, dsu, sortings	1800	x5755
2184D	Unfair Game combinatorics, dp, math	1600	x9475
2183F	Jumping Man brute force, combinatorics, dfs and similar, dp, trees	2500	x1120
2183D2	Tree Coloring (Hard Version) combinatorics, constructive algorithms, data structures, dfs and similar, greedy, implementation, trees	2100	x2495
2182G	Short Garland combinatorics, data structures, dfs and similar, dp, trees	2800	x350
2182F2	Christmas Reindeer (hard version) bitmasks, brute force, combinatorics, data structures, greedy, math	2500	x1092
2182F1	Christmas Reindeer (easy version) bitmasks, brute force, combinatorics, dp, math	2300	x1268
2182D	Christmas Tree Decoration combinatorics, dp, greedy, math	1600	x8934
2182C	Production of Snowmen brute force, combinatorics, dp	1200	x15476
2180G	Balance bitmasks, combinatorics, implementation, math	3500	x134
2180F2	Control Car (Hard Version) combinatorics, dp, matrices, probabilities	3200	x223
2180F1	Control Car (Easy Version) combinatorics, dp, probabilities	2800	x405
2178I	Numbers or Fireworks bitmasks, combinatorics, dp, graphs	3300	x219
2178F	Conquer or of Forest combinatorics, math, trees	2200	x1821
2176F	Omega Numbers bitmasks, combinatorics, dp, math, number theory	2400	x1484
2174F	Mosaic Tree combinatorics, dp, fft, math, trees	2800	x466
2174C2	Beautiful Patterns (Hard Version) combinatorics, math, probabilities	2500	x1022
2174C1	Beautiful Patterns (Easy Version) combinatorics, math, probabilities	2400	x1164
2172D	Divisor Card Game combinatorics, dp	3100	x102
2171G	Sakura Adachi and Optimal Sequences bitmasks, combinatorics, greedy, math	2000	x2317
2170E	Binary Strings and Blocks combinatorics, data structures, dp	2100	x2315
2169F	Subsequence Problem combinatorics, dp, fft, math	2700	x332
2168B	Locate binary search, combinatorics, communication, constructive algorithms, greedy, interactive		x1550
2164F2	Chain Prefix Rank (Hard Version) binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees	2900	x421
2164F1	Chain Prefix Rank (Easy Version) combinatorics, dfs and similar, dp, math, trees	2600	x649
2163E	Plegma bitmasks, combinatorics, communication, interactive	2700	x635
2163C	Monopati brute force, combinatorics, dp, math, two pointers	1500	x9006
2161F	SubMST combinatorics, graphs, trees	3000	x344
2161E	Left is Always Right combinatorics, implementation, math	2400	x780
2159C	Twin Polynomials combinatorics, graph matchings, math	2300	x1686
2158F2	Distinct GCDs (Hard Version) combinatorics, constructive algorithms, graphs, math, number theory, number theory	3000	x245
2157H	Keygen 3 brute force, combinatorics, constructive algorithms, dfs and similar, math	3200	x116
2154F2	Bombing (Hard Version) combinatorics, dp	3300	x175
2154F1	Bombing (Easy Version) brute force, combinatorics, constructive algorithms, implementation, math	2700	x563
2150G	Counting Is Fun: The Finale combinatorics, implementation	3500	x82
2150D	Attraction Theory combinatorics, dp, math	2700	x752
2150B	Grid Counting combinatorics, implementation, math	1700	x6044
2147G	Modular Tetration combinatorics, math, number theory	3100	x359
2147F	Exchange Queries combinatorics, data structures, greedy	2800	x663
2146F	Bubble Sort brute force, combinatorics, dp	2900	x301
2145G	Cost of Coloring combinatorics, divide and conquer, dp, fft, math	2900	x523
2144E2	Looking at Towers (difficult version) combinatorics, data structures, dp	2500	x1435
2144E1	Looking at Towers (easy version) combinatorics, dp	2200	x2555
2144C	Non-Descending Arrays combinatorics, dp, math	1300	x14970
2143D2	Inversion Graph Coloring (Hard Version) binary search, combinatorics, data structures, dp, two pointers	2200	x2764
2143D1	Inversion Graph Coloring (Easy Version) combinatorics, data structures, dp, greedy, two pointers	1800	x6390
2140E2	Prime Gaming (Hard Version) bitmasks, combinatorics, dp, probabilities	2500	x1236
2140E1	Prime Gaming (Easy Version) bitmasks, combinatorics, dp	2200	x2107
2138D	Antiamuny and Slider Movement brute force, combinatorics, implementation, math, sortings	2600	x640
2137F	Prefix Maximum Invariance binary search, combinatorics, data structures, sortings	1900	x4051
2135E2	Beyond the Palindrome (Hard Version) combinatorics, dp, math, number theory	3500	x164
2135E1	Beyond the Palindrome (Easy Version) combinatorics, dp, math	3300	x247
2135C	By the Assignment binary search, bitmasks, combinatorics, dfs and similar, dsu, graphs, math	2000	x3881
2134F	Permutation Oddness combinatorics, dp, math	2900	x647
2129D	Permutation Blackhole brute force, combinatorics, dp, implementation, math	2600	x944
2128D	Sum of LDS brute force, combinatorics, dp, greedy, math	1600	x12272
2127F	Hamed and AghaBalaSar brute force, combinatorics, dp, math, probabilities	2800	x1057
2127D	Root was Built by Love, Broken by Destiny combinatorics, dfs and similar, graphs, trees	1800	x6178
2125E	Sets of Complementary Sums brute force, combinatorics, dp, math, two pointers	2500	x1415
2125C	Count Good Numbers bitmasks, combinatorics, math, number theory	1100	x22732
2124F2	Appending Permutations (Hard Version) combinatorics, dp	2800	x567
2124F1	Appending Permutations (Easy Version) combinatorics, dp	2300	x1556
2122G	Tree Parking combinatorics, fft, math, trees	3300	x303
2122E	Greedy Grid Counting combinatorics, dp, greedy, math	2600	x1075
2120D	Matrix game combinatorics, math	1800	x5770
2119D	Token Removing combinatorics, dp, math	2100	x3465
2117F	Wildflower combinatorics, dfs and similar, trees	1800	x5924
2115C	Gellyfish and Eternal Violet combinatorics, dp, greedy, math, probabilities	2700	x913
2112E	Tree Colorings combinatorics, dfs and similar, dp, graphs, math, number theory, trees	2200	x3376
2109E	Binary String Wowee combinatorics, dp, strings	2400	x1792
2108A	Permutation Warm-Up combinatorics, greedy, math	800	x22138
2101F	Shoo Shatters the Sunshine combinatorics, dp, trees	3300	x155
2097B	Baggage Claim combinatorics, dfs and similar, dp, dsu, graphs, implementation, math, trees	2300	x1930
2096H	Wonderful XOR Problem bitmasks, combinatorics, dp, fft, math	3200	x223
2096D	Wonderful Lightbulbs combinatorics, constructive algorithms, math	2000	x5596
2092E	She knows... combinatorics, constructive algorithms, graphs, math	2100	x3841
2086D	Even String brute force, combinatorics, dp, math, strings	1700	x8360
2084E	Blossom binary search, combinatorics, dp, implementation, math, two pointers	2400	x1790
2081E	Quantifier combinatorics, dp, implementation	3300	x80

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