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		x870
2227G	Drowning binary search, data structures, math		x1174
2227F	It Just Keeps Going Sideways binary search, data structures, data structures, dp, dp, greedy, greedy, math, math		x2550
2227E	It All Went Sideways binary search, data structures, dp, greedy		x5626
2227D	Palindromex binary search, brute force, constructive algorithms, data structures, greedy, implementation, two pointers		x8069
2227C	Snowfall constructive algorithms, math		x14134
2227B	Party Monster greedy		x16934
2227A	Koshary implementation, math		x18173
2226G	Stop Spot implementation, strings, trees		x117
2226F	Inversion Invasion math, number theory		x169
2226E	Mental Monumental (Hard Version) data structures, greedy, math, two pointers		x703
2226D	Reserved Reversals constructive algorithms, dp, greedy, math		x2126
2226C	Mental Monumental (Easy Version) binary search, data structures, greedy, math, two pointers		x5429
2226B	Everything Everywhere greedy, math, math, number theory, number theory		x9787
2226A	Disturbing Distribution greedy, math		x10851
2225G	Simple Problem brute force, graphs, greedy, number theory		x185
2225F	String Cutting binary search, brute force, brute force, greedy, hashing, string suffix structures, string suffix structures, strings, strings		x585
2225E	Covering Points with Circles constructive algorithms, geometry, math		x1088
2225D	Exceptional Segments bitmasks, brute force, math		x6516
2225C	Red-Black Pairs dp, greedy		x11177
2225B	Alternating String brute force, greedy		x13957
2225A	A Number Between Two Others greedy, math		x17434
2222H	Counting Sort? brute force, combinatorics, dp		x102
2222G	Statistics on Tree binary search, brute force, dfs and similar, dfs and similar, divide and conquer, graphs, trees, trees		x151
2222F	Building Tree data structures, divide and conquer, dsu, graphs, graphs, implementation		x543
2222E	Seek the Truth binary search, bitmasks, constructive algorithms, interactive		x1905
2222D	Permutation Construction constructive algorithms, data structures, sortings		x3116
2222C	Median Partition dp, math		x4687
2222B	Artistic Balance Tree greedy, sortings		x7172
2222A	A Wonderful Contest brute force, dp, math		x9844
2220B	OIE Excursion greedy		x12191
2220A	Blocked greedy, sortings		x17966
2219E	Weird Chessboard constructive algorithms, math		x91
2219D	MEX Replacement on Tree data structures, implementation, math, trees		x423
2219C	Coloring a Red Black Tree dfs and similar, dp, greedy, math, probabilities, trees, trees		x1195
2219B2	Unique Values (Hard version) binary search, bitmasks, constructive algorithms, interactive		x3168
2219B1	Unique Values (Easy version) binary search, constructive algorithms, divide and conquer, interactive, math		x3557
2219A	Grid L brute force, constructive algorithms, math, number theory		x8909
2218G	The 67th Iteration of "Counting is Fun" implementation, math	1800	x3547
2218F	The 67th Tree Problem constructive algorithms, implementation, trees	1500	x7181
2218E	The 67th XOR Problem binary search, bitmasks, brute force	1200	x13910
2218D	The 67th OEIS Problem constructive algorithms, greedy, greedy, greedy, math, math, number theory	1100	x18246
2218C	The 67th Permutation Problem constructive algorithms, greedy, math	800	x26187
2218B	The 67th 6-7 Integer Problem greedy, math	800	x33350
2218A	The 67th Integer Problem brute force, games, implementation, math	800	x34585
2217H	Closer dfs and similar, dp, trees	2800	x199
2217G	Down the Pivot combinatorics, dp, math, trees	2600	x342
2217F	Interval Game bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities	2300	x685
2217E	Definitely Larger binary search, constructive algorithms, data structures, graphs, greedy, sortings	2000	x2044
2217D	Flip the Bit (Hard Version) greedy, implementation, math	1900	x3300
2217C	Grid Covering chinese remainder theorem, math, number theory	1300	x10330
2217B	Flip the Bit (Easy Version) greedy, implementation	1000	x15923
2217A	The Equalizer math	800	x21572
2216B	THU Packing Puzzle greedy	1300	x3365
2216A	Course Wishes greedy	900	x4327
2215G	Maze trees	3500	x50
2215F	Research games	3500	x44
2215E	Star Map constructive algorithms, data structures, geometry, greedy, sortings	2700	x158
2215D	EXPloration, EXPloitation, and Gain Some EXPerience! bitmasks, brute force, dp, greedy, implementation	2800	x110
2215C	Oriented Journey bitmasks, brute force, communication, constructive algorithms, graphs, interactive, trees	2200	x611
2215B	RReeppeettiittiioonn binary search, brute force, implementation, math, number theory	2000	x975
2215A	Interval Mod constructive algorithms, dp, greedy, math	1700	x2398
2214J	Special Problem *special problem, brute force, games, interactive		x3536
2214I	You Are a Robot special problem, special problem		x296
2214H	Double Vision *special problem		x1597
2214G	Anomaly *special problem, communication		x717
2214F	Numbers *special problem		x931
2214E	Shortest Paths *special problem, shortest paths		x1044
2214D	Neural Feud *special problem, strings		x4263
2214C	And? *special problem, bitmasks		x1812
2214B	Are You Smiling? special problem, special problem, *special problem, strings		x6537
2214A	Odd One Out *special problem, graph matchings, implementation		x10104
2211H	Median Deletion	3500	x98
2211G	Rational Bubble Sort constructive algorithms, geometry, greedy	2900	x276
2211F	Learning Binary Search combinatorics, divide and conquer, dp, math	2400	x910
2211E	Minimum Path Cover brute force, dp, greedy, interactive, interactive, math, number theory, trees	2500	x850
2211D	AND-array bitmasks, combinatorics, math	1900	x2878
2211C2	Equal Multisets (Hard Version) constructive algorithms, dsu, greedy	1800	x3649
2211C1	Equal Multisets (Easy Version) binary search, brute force, greedy, two pointers	1300	x9031
2211B	Mickey Mouse Constructive constructive algorithms, dp, greedy, math	1100	x11556
2211A	Antimedian Deletion implementation, math	800	x15968
2210F	A Simple Problem binary search, data structures, greedy, math, trees	2700	x212
2210E	Binary Strings are Simple? constructive algorithms, implementation, interactive, number theory	2700	x315
2210D	A Simple RBS Problem constructive algorithms, math, strings, trees	2100	x2013
2210C2	A Simple GCD Problem (Hard Version) dp, greedy, number theory	2100	x2134
2210C1	A Simple GCD Problem (Easy Version) greedy, number theory	1200	x12694
2210B	Simply Sitting on Chairs data structures, greedy	900	x17438
2210A	A Simple Sequence constructive algorithms, dp, greedy, number theory	800	x22104
2209F	Dynamic Values And Maximum Sum data structures, data structures, greedy, implementation, trees	2700	x412
2209E	A Trivial String Problem brute force, dp, hashing, string suffix structures, strings	2200	x1749
2209D	Ghostfires constructive algorithms, greedy	1800	x5299
2209C	Find the Zero constructive algorithms, interactive	1400	x10583
2209B	Array greedy	900	x19284
2209A	Flip Flops greedy	800	x21384
2208E	Counting Cute Arrays combinatorics, dp	2700	x420
2208D2	Tree Orientation (Hard Version) dfs and similar, dsu, graphs, greedy, sortings, trees	2200	x1820
2208D1	Tree Orientation (Easy Version) constructive algorithms, dfs and similar, dsu, graphs, greedy, matrices, trees	1800	x4184
2208C	Stamina and Tasks dp, greedy, math	1300	x11015
2208B	Cyclists brute force, games, greedy, implementation, math, sortings	1100	x13605
2208A	Bingo Candies constructive algorithms, math	800	x20098

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