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
1713B	Optimal Reduction constructive algorithms, sortings	1000	x22687
1713A	Traveling Salesman Problem geometry, greedy, implementation	800	x22812
1712F	Triameter binary search, data structures, dfs and similar, trees	3200	x443
1712E2	LCM Sum (hard version) brute force, data structures, math, number theory, two pointers	2500	x1613
1712E1	LCM Sum (easy version) binary search, brute force, combinatorics, math, number theory, two pointers	2300	x2460
1712D	Empty Graph binary search, constructive algorithms, data structures, greedy, shortest paths	2000	x5101
1712C	Sort Zero greedy, sortings	1100	x21266
1712B	Woeful Permutation constructive algorithms, greedy, number theory	800	x22397
1712A	Wonderful Permutation greedy, implementation	800	x25056
1711B	Party brute force, graphs	1300	x14374
1711A	Perfect Permutation constructive algorithms	800	x26501
1710E	Two Arrays binary search, games, graph matchings	2400	x583
1710D	Recover the Tree constructive algorithms, trees	3400	x559
1710C	XOR Triangle bitmasks, brute force, constructive algorithms, dp, greedy, math	2500	x1628
1710B	Rain binary search, brute force, data structures, geometry, greedy, implementation, math	2100	x2792
1710A	Color the Picture constructive algorithms, greedy, math	1500	x11909
1709F	Multiset of Strings bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees	2500	x680
1709E	XOR Tree bitmasks, data structures, dfs and similar, dsu, greedy, trees	2400	x3944
1709D	Rorororobot binary search, data structures, greedy, math	1700	x10199
1709C	Recover an RBS constructive algorithms, greedy, implementation, strings	1800	x10268
1709B	Also Try Minecraft data structures, dp, implementation	900	x25827
1709A	Three Doors brute force, greedy, implementation, math	800	x31589
1708B	Difference of GCDs constructive algorithms, math	1100	x28367
1708A	Difference Operations greedy, math	800	x22572
1707F	Bugaboo bitmasks, constructive algorithms, dp, number theory	3500	x174
1707E	Replace binary search, data structures	3500	x935
1707D	Partial Virtual Trees combinatorics, dfs and similar, dp, math, trees	3000	x890
1707C	DFS Trees dfs and similar, dsu, graphs, greedy, sortings, trees	2400	x1902
1707B	Difference Array brute force, data structures, implementation, sortings	1900	x6400
1707A	Doremy's IQ binary search, constructive algorithms, greedy, implementation	1600	x15439
1706E	Qpwoeirut and Vertices binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees	2300	x3712
1706D2	Chopping Carrots (Hard Version) brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers	2400	x1941
1706D1	Chopping Carrots (Easy Version) binary search, brute force, constructive algorithms, greedy, number theory	1700	x7714
1706C	Qpwoeirut And The City dp, flows, greedy, implementation	1400	x16140
1706B	Making Towers dp, greedy, math	1100	x17483
1706A	Another String Minimization Problem 2-sat, constructive algorithms, greedy, string suffix structures, strings	800	x24255
1705F	Mark and the Online Exam bitmasks, constructive algorithms, interactive, probabilities	2900	x694
1705E	Mark and Professor Koro binary search, bitmasks, brute force, combinatorics, data structures, greedy	2300	x2453
1705D	Mark and Lightbulbs combinatorics, constructive algorithms, greedy, math, sortings	1800	x7152
1705C	Mark and His Unfinished Essay brute force, implementation	1400	x14572
1705B	Mark the Dust Sweeper constructive algorithms, greedy, implementation	900	x25436
1705A	Mark the Photographer greedy, sortings	800	x26577
1704H2	Game of AI (hard version) combinatorics, fft, math	3500	x110
1704H1	Game of AI (easy version) combinatorics, constructive algorithms, dp, fft, math	3200	x238
1704G	Mio and Lucky Array constructive algorithms, fft, math, strings	3500	x134
1704F	Colouring Game constructive algorithms, dp, games	2600	x1304
1704E	Count Seconds brute force, constructive algorithms, dp, graphs, implementation, math	2200	x2676
1704D	Magical Array constructive algorithms, hashing, implementation, math	1900	x5379
1704C	Virus greedy, implementation, sortings	1200	x24742
1704B	Luke is a Foodie brute force, greedy, implementation	1000	x29865
1704A	Two 0-1 Sequences constructive algorithms, greedy	800	x16649
1703G	Good Key, Bad Key bitmasks, brute force, dp, greedy, math	1600	x12736
1703F	Yet Another Problem About Pairs Satisfying an Inequality binary search, data structures, dp, greedy, sortings	1300	x29988
1703E	Mirror Grid implementation	1200	x27548
1703D	Double Strings brute force, data structures, strings	1100	x29189
1703C	Cypher brute force, implementation, strings	800	x40815
1703B	ICPC Balloons data structures, implementation	800	x66088
1703A	YES or YES? brute force, implementation, strings	800	x97086
1702G2	Passable Paths (hard version) data structures, dfs and similar, trees	2000	x5784
1702G1	Passable Paths (easy version) dfs and similar, trees	1900	x6339
1702F	Equate Multisets constructive algorithms, data structures, greedy, math, number theory	1700	x9448
1702E	Split Into Two Sets dfs and similar, dsu, graphs	1600	x17818
1702D	Not a Cheap String greedy	1000	x25924
1702C	Train and Queries data structures, greedy	1100	x25102
1702B	Polycarp Writes a String from Memory greedy	800	x29302
1702A	Round Down the Price constructive algorithms	800	x38172
1701F	Points combinatorics, data structures, implementation, math, matrices	2500	x1127
1701E	Text Editor brute force, dp, greedy, strings	2500	x1344
1701D	Permutation Restoration binary search, data structures, greedy, math, sortings, two pointers	1900	x6268
1701C	Schedule Management binary search, greedy, implementation, two pointers	1400	x23809
1701B	Permutation greedy	800	x20807
1701A	Grass Field implementation	800	x27538
1700F	Puzzle constructive algorithms, dp, greedy	2600	x1056
1700E	Serega the Pirate brute force, constructive algorithms	2600	x955
1700D	River Locks binary search, dp, greedy, math	1900	x6989
1700C	Helping the Nature constructive algorithms, data structures, greedy	1700	x12156
1700B	Palindromic Numbers constructive algorithms, implementation, math	1100	x19877
1700A	Optimal Path constructive algorithms, greedy, math	800	x23659
1699E	Three Days Grace data structures, dp, greedy, math, number theory, two pointers	2600	x1372
1699D	Almost Triple Deletions data structures, dp, greedy	2300	x3514
1699C	The Third Problem combinatorics, constructive algorithms, math	1700	x10718
1699B	Almost Ternary Matrix bitmasks, constructive algorithms, matrices	900	x21687
1699A	The Third Three Number Problem constructive algorithms, math	800	x24775
1698G	Long Binary String bitmasks, math, matrices, meet-in-the-middle, number theory	2900	x384
1698F	Equal Reversal constructive algorithms, graphs, implementation, math	2800	x757
1698E	PermutationForces II brute force, combinatorics, greedy, sortings, trees, two pointers	2300	x1788
1698D	Fixed Point Guessing binary search, constructive algorithms, interactive	1600	x12072
1698C	3SUM Closure brute force, data structures	1300	x19747
1698B	Rising Sand constructive algorithms, greedy, implementation	800	x21463
1698A	XOR Mixup bitmasks, brute force	800	x32861
1697F	Too Many Constraints 2-sat, constructive algorithms, graphs, implementation	2800	x717
1697E	Coloring brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math	2400	x1449
1697D	Guess The String binary search, constructive algorithms, interactive	1900	x4994
1697C	awoo's Favorite Problem binary search, constructive algorithms, data structures, greedy, implementation, strings, two pointers	1400	x15794
1697B	Promo greedy, sortings	900	x30897
1697A	Parkway Walk greedy, implementation	800	x26738
1696H	Maximum Product? brute force, combinatorics, dp, greedy, implementation, math, two pointers	3500	x203
1696G	Fishingprince Plays With Array Again brute force, data structures, geometry, math	3300	x320
1696F	Tree Recovery brute force, constructive algorithms, dfs and similar, dsu, graphs, trees	2600	x1131
1696E	Placing Jinas combinatorics, math	2000	x4902

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