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
2227H	Fallen Leaves dfs and similar, dp, dp, trees, trees		x901
2227F	It Just Keeps Going Sideways binary search, data structures, data structures, dp, dp, greedy, greedy, math, math		x2637
2227E	It All Went Sideways binary search, data structures, dp, greedy		x5764
2226D	Reserved Reversals constructive algorithms, dp, greedy, math		x2052
2225C	Red-Black Pairs dp, greedy		x11207
2222H	Counting Sort? brute force, combinatorics, dp		x102
2222C	Median Partition dp, math		x4701
2222A	A Wonderful Contest brute force, dp, math		x9869
2219C	Coloring a Red Black Tree dfs and similar, dp, greedy, math, probabilities, trees, trees		x1195
2217H	Closer dfs and similar, dp, trees	2800	x200
2217G	Down the Pivot combinatorics, dp, math, trees	2600	x343
2217F	Interval Game bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities	2300	x690
2215D	EXPloration, EXPloitation, and Gain Some EXPerience! bitmasks, brute force, dp, greedy, implementation	2800	x111
2215A	Interval Mod constructive algorithms, dp, greedy, math	1700	x2412
2211F	Learning Binary Search combinatorics, divide and conquer, dp, math	2400	x913
2211E	Minimum Path Cover brute force, dp, greedy, interactive, interactive, math, number theory, trees	2500	x851
2211B	Mickey Mouse Constructive constructive algorithms, dp, greedy, math	1100	x11571
2210C2	A Simple GCD Problem (Hard Version) dp, greedy, number theory	2100	x2137
2210A	A Simple Sequence constructive algorithms, dp, greedy, number theory	800	x22122
2209E	A Trivial String Problem brute force, dp, hashing, string suffix structures, strings	2200	x1754
2208E	Counting Cute Arrays combinatorics, dp	2700	x422
2208C	Stamina and Tasks dp, greedy, math	1300	x11028
2207F	Hanabi binary search, data structures, dp, dsu, flows, graph matchings, graphs, greedy	2900	x268
2207D	Boxed Like a Fish dfs and similar, dp, games, shortest paths, trees	2200	x2106
2207C	Where's My Water? data structures, divide and conquer, dp, math	1600	x5412
2206I	Growth Factor combinatorics, dp, math, number theory	2900	x166
2206D	Christmas Tree Un-decoration data structures, dp, trees	2600	x239
2205E	Simons and Dividing the Rhythm combinatorics, data structures, dp, dsu, math, string suffix structures, strings, strings, strings	2100	x1561
2205D	Simons and Beating Peaks data structures, data structures, divide and conquer, dp, dp, greedy, implementation, trees	1700	x4900
2204G	Grid Path dp, dp, graphs, matrices	2700	x402
2203F	Binary Search with One Swap binary search, divide and conquer, dp, hashing, math, two pointers	2600	x414
2203B	Beautiful Numbers bitmasks, dp, fft, greedy, math	1000	x14226
2202B	ABAB Construction dp, greedy, greedy, greedy, implementation	1200	x11107
2201C	Rigged Bracket Sequence combinatorics, dp, greedy	2000	x1985
2201A2	Lost Civilization (Hard Version) data structures, dp	1700	x5075
2200G	Operation Permutation combinatorics, dp, math, probabilities	2200	x1023
2199H	Sum of MEX *special problem, combinatorics, data structures, dp, math	2300	x90
2196E2	Fuzzy Concatenation (Hard version) binary search, bitmasks, data structures, dp, greedy, string suffix structures	3000	x198
2196D	Double Bracket Sequence data structures, dp, expression parsing, flows, greedy, strings	2500	x992
2196C2	Interactive Graph (Hard Version) combinatorics, dfs and similar, dp, graphs, interactive	2000	x2515
2196C1	Interactive Graph (Simple Version) binary search, combinatorics, dfs and similar, dp, graphs, interactive	1800	x3582
2195G	Idiot First Search and Queries binary search, data structures, dp, graphs, trees	2300	x1041
2195F	Parabola Independence dp, graphs, greedy, math, sortings	2000	x2694
2195E	Idiot First Search dfs and similar, dp, trees	1500	x8528
2195C	Dice Roll Sequence dp, greedy	1100	x20499
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
2194E	The Turtle Strikes Back dp, graphs, greedy, implementation	2000	x2607
2194C	Secret message bitmasks, brute force, dp, math, number theory	1300	x10877
2193H	Remove the Grail Tree dfs and similar, dp, graphs, greedy, implementation, trees	2400	x1043
2193F	Pizza Delivery dp, greedy	1600	x8439
2193E	Product Queries dp, math, number theory, shortest paths	1300	x15175
2192F	Fish Fight dp, dp, math, probabilities, probabilities	2900	x172
2192D	Cost of Tree dp, greedy, trees, trees	1800	x3536
2190F	Xor Product bitmasks, dp	3300	x92
2190B2	Sub-RBS (Hard Version) dp, games, implementation, strings	1900	x3179
2190B1	Sub-RBS (Easy Version) combinatorics, constructive algorithms, dp, greedy, strings, two pointers	1400	x10657
2189F	Zhora the Vacuum Cleaner data structures, dfs and similar, dp, greedy, implementation, sortings, trees	2800	x227
2189D2	Little String (Hard Version) combinatorics, dp, greedy, math, number theory	2200	x1943
2189D1	Little String (Easy Version) combinatorics, dp, greedy, math, number theory	1900	x3955
2187F2	Al Fine (Counting Version) dp, trees	3500	x70
2187E	Doors and Keys brute force, data structures, dp	3500	x325
2187D	Cool Problem bitmasks, dp, math	2600	x634
2187B	Shortest Statement Ever bitmasks, constructive algorithms, dp, greedy	1800	x5276
2185H	BattleCows 2 binary search, brute force, data structures, dp, greedy	2500	x679
2184F	Cherry Tree dfs and similar, dp, graphs, trees	1900	x3889
2184D	Unfair Game combinatorics, dp, math	1600	x9484
2184C	Huge Pile binary search, dfs and similar, dp, graphs, math	1100	x21835
2183H	Minimise Cost binary search, dp, greedy, sortings	3500	x159
2183F	Jumping Man brute force, combinatorics, dfs and similar, dp, trees	2500	x1124
2183E	LCM is Legendary Counting Master dp, math, number theory	2100	x2850
2182G	Short Garland combinatorics, data structures, dfs and similar, dp, trees	2800	x350
2182F1	Christmas Reindeer (easy version) bitmasks, brute force, combinatorics, dp, math	2300	x1269
2182D	Christmas Tree Decoration combinatorics, dp, greedy, math	1600	x8940
2182C	Production of Snowmen brute force, combinatorics, dp	1200	x15497
2181M	Medical Parity dp, strings	1700	x3473
2181J	Jinx or Jackpot brute force, dp, math, probabilities	2300	x707
2181G	Greta's Game binary search, dp, graphs, greedy, math	2400	x648
2180F2	Control Car (Hard Version) combinatorics, dp, matrices, probabilities	3200	x223
2180F1	Control Car (Easy Version) combinatorics, dp, probabilities	2800	x405
2180E	No Effect XOR bitmasks, divide and conquer, dp, greedy, math	2300	x1737
2180D	Insolvable Disks data structures, dp, greedy, math	1900	x4251
2180C	XOR-factorization bitmasks, constructive algorithms, dp, greedy, number theory	1900	x6458
2179H	Blackslex and Plants bitmasks, data structures, dp, implementation, math	2200	x1301
2179B	Blackslex and Showering dp, greedy, implementation	800	x28321
2178I	Numbers or Fireworks bitmasks, combinatorics, dp, graphs	3300	x219
2178G	deCH OR Dations bitmasks, data structures, dp, hashing, probabilities	2800	x593
2178C	First or Second dp, greedy, implementation	1200	x15680
2178B	Impost or Sus dp, greedy, implementation, strings	900	x21572
2176F	Omega Numbers bitmasks, combinatorics, dp, math, number theory	2400	x1487
2176E	Remove at the lowest cost data structures, dfs and similar, dp, dsu, greedy, implementation, trees	2400	x1276
2176D	Fibonacci Paths data structures, dp, graphs, sortings	1800	x5756
2174F	Mosaic Tree combinatorics, dp, fft, math, trees	2800	x466
2174D	Secret Message data structures, dp, greedy, trees	3400	x292
2174B	Wishing Cards dp	1900	x3962
2173D	Taiga's Carry Chains bitmasks, brute force, dp, greedy, math	1900	x3630
2173B	Niko's Tactical Cards dp, greedy, math	1100	x18108
2172L	Maximum Color Segment dp, implementation	2300	x801
2172D	Divisor Card Game combinatorics, dp	3100	x103
2171H	Shiori Miyagi and Maximum Array Score binary search, data structures, dp, sortings	2400	x1013

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