Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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bitmasks

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Problems

#	Name
2225D	Exceptional Segments bitmasks, brute force, math		x6542
2222E	Seek the Truth binary search, bitmasks, constructive algorithms, interactive		x1912
2219B2	Unique Values (Hard version) binary search, bitmasks, constructive algorithms, interactive		x3180
2218E	The 67th XOR Problem binary search, bitmasks, brute force	1200	x13936
2217F	Interval Game bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities	2300	x691
2215D	EXPloration, EXPloitation, and Gain Some EXPerience! bitmasks, brute force, dp, greedy, implementation	2800	x111
2215C	Oriented Journey bitmasks, brute force, communication, constructive algorithms, graphs, interactive, trees	2200	x612
2214C	And? *special problem, bitmasks		x1812
2211D	AND-array bitmasks, combinatorics, math	1900	x2882
2205G	Simons and Diophantus Equation bitmasks, brute force, data structures, math, number theory	3000	x203
2203C	Test Generator binary search, bitmasks, greedy, math	1500	x6993
2203B	Beautiful Numbers bitmasks, dp, fft, greedy, math	1000	x14229
2200B	Deletion Sort bitmasks, brute force, greedy, sortings	800	x25410
2196E2	Fuzzy Concatenation (Hard version) binary search, bitmasks, data structures, dp, greedy, string suffix structures	3000	x198
2196E1	Fuzzy Concatenation (Easy Version) binary search, bitmasks, brute force, data structures, greedy, string suffix structures	2900	x282
2194F2	Again Trees... (hard version) bitmasks, data structures, dfs and similar, dp, fft, trees	3000	x167
2194F1	Again Trees... (Easy Version) bitmasks, dfs and similar, dp, trees	2300	x885
2194C	Secret message bitmasks, brute force, dp, math, number theory	1300	x10877
2190F	Xor Product bitmasks, dp	3300	x92
2189C2	XOR-convenience (Hard Version) bitmasks, constructive algorithms, math	1800	x6203
2189C1	XOR Convenience (Easy Version) bitmasks, constructive algorithms, math	1300	x13885
2187D	Cool Problem bitmasks, dp, math	2600	x634
2187B	Shortest Statement Ever bitmasks, constructive algorithms, dp, greedy	1800	x5276
2182F2	Christmas Reindeer (hard version) bitmasks, brute force, combinatorics, data structures, greedy, math	2500	x1093
2182F1	Christmas Reindeer (easy version) bitmasks, brute force, combinatorics, dp, math	2300	x1269
2180G	Balance bitmasks, combinatorics, implementation, math	3500	x134
2180E	No Effect XOR bitmasks, divide and conquer, dp, greedy, math	2300	x1737
2180C	XOR-factorization bitmasks, constructive algorithms, dp, greedy, number theory	1900	x6458
2179H	Blackslex and Plants bitmasks, data structures, dp, implementation, math	2200	x1301
2179D	Blackslex and Penguin Civilization bitmasks, constructive algorithms, greedy, math	1300	x13500
2178I	Numbers or Fireworks bitmasks, combinatorics, dp, graphs	3300	x219
2178H	Create or Duplicate bitmasks, graphs, number theory, shortest paths	3300	x311
2178G	deCH OR Dations bitmasks, data structures, dp, hashing, probabilities	2800	x593
2176F	Omega Numbers bitmasks, combinatorics, dp, math, number theory	2400	x1487
2176B	Optimal Shifts bitmasks, greedy, strings	1000	x22888
2173D	Taiga's Carry Chains bitmasks, brute force, dp, greedy, math	1900	x3630
2171G	Sakura Adachi and Optimal Sequences bitmasks, combinatorics, greedy, math	2000	x2321
2171C2	Renako Amaori and XOR Game (hard version) bitmasks, games, greedy	1400	x11830
2171C1	Renako Amaori and XOR Game (easy version) bitmasks, games, greedy	1100	x19221
2170F	Build XOR on a Segment bitmasks, dp	2600	x777
2170A	Maximum Neighborhood bitmasks, brute force, greedy, implementation, math	800	x19886
2168C	Intercepting Butterflies bitmasks, communication, constructive algorithms, graphs, interactive		x876
2168A2	Encode and Decode (Hard Version) bitmasks, communication, interactive, math		x3303
2165C	Binary Wine bitmasks, greedy, math	2000	x3515
2163E	Plegma bitmasks, combinatorics, communication, interactive	2700	x636
2162C	Beautiful XOR bitmasks, constructive algorithms, greedy	1100	x21311
2161G	Bitwise And Equals bitmasks, greedy	3500	x91
2160C	Reverse XOR bitmasks	1300	x15147
2157G	Isaac's Queries bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities	2800	x411
2156D	Find the Last Number binary search, bitmasks, constructive algorithms, interactive	1900	x5369
2153F	Odd Queries on Odd Array bitmasks, brute force, data structures, implementation, trees	2900	x323
2153B	Bitwise Reversion bitmasks, greedy	800	x22581
2147E	Maximum OR Popcount binary search, bitmasks, brute force, data structures, greedy	2300	x2117
2146D2	Max Sum OR (Hard Version) bitmasks, constructive algorithms, divide and conquer, greedy	2000	x4032
2146D1	Max Sum OR (Easy Version) bitmasks, constructive algorithms, divide and conquer, greedy, trees	1500	x10449
2143F	Increasing Xor bitmasks, data structures, math	2700	x422
2140E2	Prime Gaming (Hard Version) bitmasks, combinatorics, dp, probabilities	2500	x1237
2140E1	Prime Gaming (Easy Version) bitmasks, combinatorics, dp	2200	x2108
2138C2	Maple and Tree Beauty (Hard Version) bitmasks, brute force, dfs and similar, dp, fft, trees	2000	x3366
2138A	Cake Assignment bitmasks, constructive algorithms, greedy	1100	x16991
2135C	By the Assignment binary search, bitmasks, combinatorics, dfs and similar, dsu, graphs, math	2000	x3881
2131G	Wafu! bitmasks, brute force, data structures, dfs and similar, dp, math	2000	x3770
2129C3	Interactive RBS (Hard Version) binary search, bitmasks, constructive algorithms, dp, interactive	2300	x1663
2129C2	Interactive RBS (Medium Version) binary search, bitmasks, constructive algorithms, interactive	2000	x2502
2129C1	Interactive RBS (Easy Version) binary search, bitmasks, constructive algorithms, interactive	1900	x3856
2127G2	Inter Active (Hard Version) binary search, bitmasks, constructive algorithms, graphs, implementation, interactive, math, probabilities	3500	x107
2125C	Count Good Numbers bitmasks, combinatorics, math, number theory	1100	x22740
2119E	And Constraint bitmasks, dp, greedy	2600	x705
2119C	A Good Problem bitmasks, constructive algorithms, math	1300	x16288
2119A	Add or XOR bitmasks, greedy, math	800	x27186
2118C	Make It Beautiful bitmasks, data structures, greedy, math	1300	x18462
2115D	Gellyfish and Forget-Me-Not bitmasks, dp, games, greedy, math	2900	x1101
2111G	Divisible Subarrays binary search, bitmasks, brute force, data structures, interactive	2900	x398
2109C1	Hacking Numbers (Easy Version) bitmasks, constructive algorithms, interactive, math, number theory	1500	x11416
2109B	Slice to Survive bitmasks, greedy, math	1200	x17330
2108B	SUMdamental Decomposition bitmasks, constructive algorithms, greedy, implementation, math	1300	x14540
2103F	Maximize Nor bitmasks, data structures, dp, implementation, sortings	2600	x618
2097D	Homework bitmasks, math, matrices	2800	x554
2096H	Wonderful XOR Problem bitmasks, combinatorics, dp, fft, math	3200	x223
2096G	Wonderful Guessing Game bitmasks, constructive algorithms, interactive	3200	x421
2094E	Boneca Ambalabu bitmasks	1200	x18557
2093G	Shorten the Array binary search, bitmasks, data structures, dfs and similar, greedy, strings, trees, two pointers	1900	x3801
2093F	Hackers and Neural Networks bitmasks, brute force, greedy	1800	x5881
2093D	Skibidi Table bitmasks, implementation	1400	x12268
2086E	Zebra-like Numbers bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy, math	2400	x1664
2085C	Serval and The Formula bitmasks, constructive algorithms, dp, greedy	1600	x13555
2081C	Quaternary Matrix bitmasks, constructive algorithms, greedy, implementation, matrices	2700	x353
2081A	Math Division bitmasks, dp, math, probabilities	1800	x4078
2077G	RGB Walking bitmasks, chinese remainder theorem, dfs and similar, graphs, number theory	3500	x135
2077F	AND x OR bitmasks, constructive algorithms, dp	3300	x261
2077B	Finding OR Sum bitmasks, constructive algorithms, implementation, interactive, math	1900	x3654
2075E	XOR Matrix bitmasks, combinatorics, dp, implementation, math	2500	x1184
2075D	Equalization bitmasks, brute force, dp, graphs, math	2000	x5824
2074F	Counting Necessary Nodes bitmasks, divide and conquer, greedy, implementation, math	2000	x2474
2074C	XOR and Triangle bitmasks, brute force, geometry, greedy, probabilities	1100	x21968
2072F	Goodbye, Banker Life 2-sat, bitmasks, combinatorics, constructive algorithms, fft, math, number theory	1700	x8440
2072C	Creating Keys for StORages Has Become My Main Skill bitmasks, constructive algorithms, greedy	1200	x19564
2071D2	Infinite Sequence (Hard Version) bitmasks, brute force, constructive algorithms, data structures, dp, implementation, math	2500	x1100
2071D1	Infinite Sequence (Easy Version) bitmasks, brute force, dp, implementation, math	1800	x6691
2070F	Friends and Pizza bitmasks, divide and conquer, dp, fft	3000	x369

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