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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Problems

#	Name
72E	Ali goes shopping *special problem, brute force, strings	1800	x181
72D	Perse-script *special problem, expression parsing	2300	x83
72C	Extraordinarily Nice Numbers *special problem, math	1200	x1052
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	x7324
71B	Progress Bar implementation, math	1300	x5269
71A	Way Too Long Words strings	800	x502604
70E	Information Reform dp, implementation, trees	2700	x589
70D	Professor's task data structures, geometry	2700	x1093
70C	Lucky Tickets binary search, data structures, sortings, two pointers	2200	x632
70B	Text Messaging expression parsing, greedy, strings	1600	x2102
70A	Cookies math	1300	x3559
69E	Subsegments data structures, implementation	1800	x5086
69D	Dot dp, games	1900	x1129
69C	Game implementation	2000	x674
69B	Bets greedy, implementation	1200	x3616
69A	Young Physicist implementation, math	1000	x202104
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	x5577
68A	Irrational problem implementation, number theory	1100	x5362
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	x2478
66E	Petya and Post data structures, dp	2000	x926
66D	Petya and His Friends constructive algorithms, math, number theory	1700	x3604
66C	Petya and File System data structures, implementation	1800	x1185
66B	Petya and Countryside brute force, implementation	1100	x23100
66A	Petya and Java implementation, strings	1300	x7079
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
64A	Factorial *special problem, implementation	1300	x4247
63E	Sweets Game bitmasks, dfs and similar, dp, games, implementation	2000	x855
63D	Dividing Island constructive algorithms	1900	x1446
63C	Bulls and Cows brute force, implementation	1700	x2002
63B	Settlers' Training implementation	1200	x5209
63A	Sinking Ship implementation, sortings, strings	900	x13414
62E	World Evil dp, flows	2700	x282
62D	Wormhouse dfs and similar, graphs	2300	x449
62C	Inquisition geometry, implementation, sortings	2300	x336
62B	Tyndex.Brome binary search, implementation	1800	x1403
62A	A Student's Dream greedy, math	1300	x3769
61E	Enemy is weak data structures, trees	1900	x15147
61D	Eternal Victory dfs and similar, graphs, greedy, shortest paths, trees	1800	x7634
61C	Capture Valerian math	2000	x851
61B	Hard Work strings	1300	x4240
61A	Ultra-Fast Mathematician implementation	800	x136072
60E	Mushroom Gnomes math, matrices	2600	x414
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	x5306
60A	Where Are My Flakes? implementation, two pointers	1300	x4283
59E	Shortest Path graphs, shortest paths	2000	x4807
59D	Team Arrangement constructive algorithms, greedy, implementation	2000	x747
59C	Title expression parsing	1600	x2453
59B	Fortune Telling implementation, number theory	1200	x7952
59A	Word implementation, strings	800	x227650
58E	Expression dp	2400	x462
58D	Calendar greedy, strings	2000	x835
58C	Trees brute force	1800	x2263
58B	Coins greedy	1300	x13225
58A	Chat room greedy, strings	1000	x155843
57E	Chess math, shortest paths	3000	x289
57D	Journey dp, math	2500	x360
57C	Array combinatorics, math	1900	x4002
57B	Martian Architecture implementation	1600	x1167
57A	Square Earth? dfs and similar, greedy, implementation	1300	x3251
56E	Domino Principle binary search, data structures, sortings	2200	x2837
56D	Changing a String dp	2100	x2083
56C	Corporation Mail data structures, expression parsing, implementation	1700	x1304
56B	Spoilt Permutation implementation	1300	x4022
56A	Bar implementation	1000	x9634
55E	Very simple problem geometry, two pointers	2500	x820
55D	Beautiful numbers dp, number theory	2500	x4618
55C	Pie or die games	1900	x1827
55B	Smallest number brute force	1600	x3446
55A	Flea travel implementation, math	1200	x3884
54E	Vacuum Сleaner geometry	2700	x213
54D	Writing a Song brute force, dp, strings	2100	x709
54C	First Digit Law dp, math, probabilities	2000	x1639
54B	Cutting Jigsaw Puzzle hashing, implementation	1800	x909
54A	Presents implementation	1300	x2544
53E	Dead Ends bitmasks, dp	2500	x1275

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