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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Problems

#	Name
95B	Lucky Numbers dp, greedy	1800	x1399
95A	Hockey implementation, strings	1600	x1856
94B	Friends graphs, implementation, math	1300	x5379
94A	Restoring Password implementation, strings	900	x12256
93E	Lostborn dp, math, number theory	2600	x540
93D	Flags dp, math, matrices	2500	x444
93C	Azembler brute force, implementation	2500	x450
93B	End of Exams greedy	1900	x988
93A	Frames implementation	1700	x2071
92B	Binary Number greedy	1300	x5361
92A	Chips implementation, math	800	x21523
91E	Igloo Skyscraper data structures, geometry	2500	x671
91D	Grocer's Problem constructive algorithms, graphs, greedy	2600	x297
91C	Ski Base combinatorics, dsu, graphs	2300	x1011
91B	Queue binary search, data structures	1500	x7727
91A	Newspaper Headline greedy, strings	1500	x3951
90B	African Crossword implementation, strings	1100	x5714
90A	Cableway greedy, math	1000	x5493
89E	Fire and Ice greedy	2900	x118
89D	Space mines geometry	2500	x264
89C	Chip Play brute force, data structures, implementation	2300	x688
89B	Widget Library dp, expression parsing, graphs, implementation	2300	x610
89A	Robbery greedy	1800	x1613
88B	Keyboard implementation	1500	x5256
88A	Chord brute force, implementation	1200	x4088
87E	Mogohu-Rea Idol geometry	2600	x756
87D	Beautiful Road dfs and similar, dp, dsu, graphs, implementation, sortings, trees	2300	x1055
87C	Interesting Game dp, games, math	2000	x1685
87B	Vasya and Types implementation, strings	1800	x1265
87A	Trains implementation, math	1500	x5814
86E	Long sequence brute force, math, matrices	2700	x205
86D	Powerful array data structures, implementation, math, two pointers	2200	x16858
86C	Genetic engineering dp, string suffix structures, trees	2500	x861
86B	Tetris revisited constructive algorithms, graph matchings, greedy, math	2200	x452
86A	Reflection math	1600	x1659
85E	Guard Towers binary search, dsu, geometry, graphs, sortings	2600	x1102
85D	Sum of Medians binary search, brute force, data structures, implementation	2300	x2419
85C	Petya and Tree binary search, dfs and similar, probabilities, sortings, trees	2200	x618
85B	Embassy Queue data structures, greedy	1800	x1081
85A	Domino constructive algorithms, implementation	1300	x2021
84C	Biathlon binary search, implementation	1700	x1855
84A	Toy Army math, number theory	900	x16615
83E	Two Subsequences bitmasks, dp	2800	x539
83D	Numbers dp, math, number theory	2400	x1033
83C	Track graphs, greedy, shortest paths	2400	x476
83B	Doctor binary search, math, sortings	1800	x1892
83A	Magical Array math	1300	x6854
82E	Corridor geometry	2600	x247
82D	Two out of Three dp	2000	x2300
82C	General Mobilization data structures, dfs and similar, sortings	2000	x871
82B	Sets constructive algorithms, hashing, implementation	1700	x2336
82A	Double Cola implementation, math	1100	x32228
81E	Pairs dfs and similar, dp, dsu, graphs, implementation, trees	2700	x399
81D	Polycarp's Picture Gallery constructive algorithms, greedy	2100	x805
81C	Average Score greedy, math, sortings	1700	x1851
81B	Sequence Formatting implementation, strings	1700	x2141
81A	Plug-in implementation	1400	x13877
80B	Depression geometry, math	1200	x4997
80A	Panoramix's Prediction brute force	800	x66237
79E	Security System math	2900	x160
79D	Password bitmasks, dp, shortest paths	2800	x1340
79C	Beaver data structures, dp, greedy, hashing, strings, two pointers	1800	x2111
79B	Colorful Field implementation, sortings	1400	x7989
79A	Bus Game greedy	1200	x4555
78E	Evacuation flows, graphs, shortest paths	2300	x693
78D	Archer's Shot binary search, geometry, math, two pointers	2300	x373
78C	Beaver Game dp, games, number theory	2000	x2174
78B	Easter Eggs constructive algorithms, implementation	1200	x15340
78A	Haiku implementation, strings	800	x15429
77E	Martian Food geometry	2800	x422
77D	Domino Carpet dp, implementation	2300	x363
77C	Beavermuncher-0xFF dfs and similar, dp, dsu, greedy, trees	2100	x1172
77B	Falling Anvils math, probabilities	1800	x2864
77A	Heroes brute force, implementation	1400	x1953
76F	Tourist binary search, data structures, dp	2300	x771
76E	Points implementation, math	1700	x1892
76D	Plus and xor dp, greedy, math	1700	x2403
76C	Mutation bitmasks, dp, math	2700	x369
76B	Mice greedy, two pointers	2100	x801
76A	Gift dsu, graphs, sortings, trees	2200	x2196
75E	Ship's Shortest Path geometry, shortest paths	2400	x302
75D	Big Maximum Sum data structures, dp, greedy, implementation, math, trees	2000	x2050
75C	Modified GCD binary search, number theory	1600	x15625
75B	Facetook Priority Wall expression parsing, implementation, strings	1500	x3621
75A	Life Without Zeros implementation	1000	x29712
74E	Shift It! constructive algorithms	2800	x185
74D	Hanger data structures	2400	x413
74C	Chessboard Billiard dfs and similar, dsu, graphs, number theory	2100	x1412
74B	Train dp, games, greedy	1500	x1780
74A	Room Leader implementation	1000	x5863
73F	Plane of Tanks brute force, geometry	2900	x107
73E	Morrowindows math, number theory	2400	x412
73D	FreeDiv dfs and similar, graphs, greedy	2200	x755
73C	LionAge II dp	1800	x2487
73B	Need For Brake binary search, greedy, sortings	2000	x547
73A	The Elder Trolls IV: Oblivon greedy, math	1600	x1638
72I	Goofy Numbers *special problem, implementation	1500	x483
72H	Reverse It! *special problem, implementation	1600	x284
72G	Fibonacci army *special problem, dp	1000	x2832
72F	Oil *special problem, greedy, math	1900	x143

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