Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
31:09:44
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
31:09:44
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Problems

#	Name
83B	Doctor binary search, math, sortings	1800	x1892
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
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	x13890
79E	Security System math	2900	x160
79D	Password bitmasks, dp, shortest paths	2800	x1341
79C	Beaver data structures, dp, greedy, hashing, strings, two pointers	1800	x2111
79B	Colorful Field implementation, sortings	1400	x7990
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	x2175
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	x2867
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	x2260
75E	Ship's Shortest Path geometry, shortest paths	2400	x302
75D	Big Maximum Sum data structures, dp, greedy, implementation, math, trees	2000	x2052
75C	Modified GCD binary search, number theory	1600	x15643
75B	Facetook Priority Wall expression parsing, implementation, strings	1500	x3621
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	x1785
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	x2488
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
72F	Oil *special problem, greedy, math	1900	x143
72E	Ali goes shopping *special problem, brute force, strings	1800	x181
72D	Perse-script *special problem, expression parsing	2300	x83
72B	INI-file *special problem, implementation	2200	x117
72A	Goshtasp, Vishtasp and Eidi *special problem, greedy, math	1800	x194
71E	Nuclear Fusion bitmasks, dp	2200	x943
71D	Solitaire brute force, implementation	2200	x769
71C	Round Table Knights dp, math, number theory	1600	x7327
70E	Information Reform dp, implementation, trees	2700	x589
70D	Professor's task data structures, geometry	2700	x1095
70C	Lucky Tickets binary search, data structures, sortings, two pointers	2200	x632
70B	Text Messaging expression parsing, greedy, strings	1600	x2102
69E	Subsegments data structures, implementation	1800	x5086
69D	Dot dp, games	1900	x1130
69C	Game implementation	2000	x674
68E	Contact geometry	2900	x84
68D	Half-decay tree data structures, divide and conquer, dp, math, probabilities	2500	x531
68C	Synchrophasotron brute force	2200	x353
68B	Energy exchange binary search	1600	x5578
67E	Save the City! geometry	2500	x342
67D	Optical Experiment binary search, data structures, dp	1900	x1777
67C	Sequence of Balls dp	2600	x745
67B	Restoration of the Permutation greedy	1800	x944
67A	Partial Teacher dp, graphs, greedy, implementation	1800	x2481
66E	Petya and Post data structures, dp	2000	x926
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3610
66C	Petya and File System data structures, implementation	1800	x1185
65E	Harry Potter and Moving Staircases dfs and similar, implementation	2900	x106
65D	Harry Potter and the Sorting Hat brute force, dfs and similar, hashing	2200	x480
65C	Harry Potter and the Golden Snitch binary search, geometry	2100	x869
65B	Harry Potter and the History of Magic brute force, greedy, implementation	1700	x1551
65A	Harry Potter and Three Spells implementation, math	1800	x2014
64I	Sort the Table *special problem, sortings	2400	x94
64H	Table Bowling *special problem, sortings	2300	x122
64G	Path Canonization *special problem	2200	x129
64F	Domain *special problem, expression parsing	2000	x193
64E	Prime Segment *special problem, brute force, math, number theory	1800	x295
64D	Presents *special problem, greedy	1800	x298
64C	Table *special problem, greedy, implementation, math	1600	x356
64B	Expression *special problem, expression parsing	1500	x1053
63E	Sweets Game bitmasks, dfs and similar, dp, games, implementation	2000	x855
63D	Dividing Island constructive algorithms	1900	x1447
63C	Bulls and Cows brute force, implementation	1700	x2002
62E	World Evil dp, flows	2700	x282
62D	Wormhouse dfs and similar, graphs	2300	x449
62C	Inquisition geometry, implementation, sortings	2300	x337
62B	Tyndex.Brome binary search, implementation	1800	x1403
61E	Enemy is weak data structures, trees	1900	x15170
61D	Eternal Victory dfs and similar, graphs, greedy, shortest paths, trees	1800	x7637
61C	Capture Valerian math	2000	x851
60E	Mushroom Gnomes math, matrices	2600	x415
60D	Savior brute force, dsu, math	2500	x547
60C	Mushroom Strife brute force, dfs and similar	2100	x654
60B	Serial Time! dfs and similar, dsu	1400	x5309
59E	Shortest Path graphs, shortest paths	2000	x4811
59D	Team Arrangement constructive algorithms, greedy, implementation	2000	x748

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