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		x753
2227G	Drowning binary search, data structures, math		x1011
2227F	It Just Keeps Going Sideways binary search, data structures, data structures, dp, dp, greedy, greedy, math, math		x2281
2227E	It All Went Sideways binary search, data structures, dp, greedy		x5137
2227D	Palindromex binary search, brute force, constructive algorithms, data structures, greedy, implementation, two pointers		x7405
2227C	Snowfall constructive algorithms, math		x13220
2227B	Party Monster greedy		x15878
2227A	Koshary implementation, math		x17002
2226G	Stop Spot strings, trees		x109
2226F	Inversion Invasion math, number theory		x160
2226E	Mental Monumental (Hard Version) data structures, greedy, math, two pointers		x663
2226D	Reserved Reversals constructive algorithms, dp, greedy, math		x2046
2226C	Mental Monumental (Easy Version) binary search, data structures, greedy, math, two pointers		x5263
2226B	Everything Everywhere greedy, math, math, number theory, number theory		x9556
2226A	Disturbing Distribution greedy, math		x10595
2225G	Simple Problem brute force, graphs, greedy, number theory		x183
2225F	String Cutting binary search, brute force, brute force, greedy, hashing, string suffix structures, string suffix structures, strings, strings		x580
2225E	Covering Points with Circles constructive algorithms, geometry, math		x1077
2225D	Exceptional Segments bitmasks, brute force, math		x6479
2225C	Red-Black Pairs dp, greedy		x11119
2225B	Alternating String brute force, greedy		x13883
2225A	A Number Between Two Others greedy, math		x17339
2222H	Counting Sort? brute force, combinatorics, dp		x96
2222G	Statistics on Tree binary search, brute force, dfs and similar, dfs and similar, divide and conquer, graphs, trees, trees		x146
2222F	Building Tree data structures, divide and conquer, dsu, graphs, graphs, implementation		x527
2222E	Seek the Truth binary search, bitmasks, constructive algorithms, interactive		x1874
2222D	Permutation Construction constructive algorithms, data structures, sortings		x3073
2222C	Median Partition dp, math		x4634
2222B	Artistic Balance Tree greedy, sortings		x7123
2222A	A Wonderful Contest brute force, dp, math		x9782
2220B	OIE Excursion greedy		x12156
2220A	Blocked greedy, sortings		x17913
2219E	Weird Chessboard constructive algorithms, math		x89
2219D	MEX Replacement on Tree data structures, implementation, math, trees		x418
2219C	Coloring a Red Black Tree dfs and similar, dp, greedy, math, probabilities, trees, trees		x1185
2219B2	Unique Values (Hard version) binary search, bitmasks, constructive algorithms, interactive		x3152
2219B1	Unique Values (Easy version) binary search, constructive algorithms, divide and conquer, interactive, math		x3537
2219A	Grid L brute force, constructive algorithms, math, number theory		x8868
2218G	The 67th Iteration of "Counting is Fun" implementation, math	1800	x3521
2218F	The 67th Tree Problem constructive algorithms, implementation, trees	1500	x7142
2218E	The 67th XOR Problem binary search, bitmasks, brute force	1200	x13834
2218D	The 67th OEIS Problem constructive algorithms, greedy, greedy, greedy, math, math, number theory	1100	x18161
2218C	The 67th Permutation Problem constructive algorithms, greedy, math	800	x26064
2218B	The 67th 6-7 Integer Problem greedy, math	800	x33194
2218A	The 67th Integer Problem brute force, games, implementation, math	800	x34419
2217H	Closer dfs and similar, dp, trees	2800	x197
2217G	Down the Pivot combinatorics, dp, math, trees	2600	x336
2217F	Interval Game bitmasks, combinatorics, constructive algorithms, dp, games, games, greedy, greedy, math, probabilities	2300	x682
2217E	Definitely Larger binary search, constructive algorithms, data structures, graphs, greedy, sortings	2000	x2028
2217D	Flip the Bit (Hard Version) greedy, implementation, math	1900	x3287
2217C	Grid Covering chinese remainder theorem, math, number theory	1300	x10301
2217B	Flip the Bit (Easy Version) greedy, implementation	1000	x15863
2217A	The Equalizer math	800	x21473
2216B	THU Packing Puzzle greedy	1300	x3316
2216A	Course Wishes greedy	900	x4279
2215G	Maze trees	3500	x50
2215F	Research games	3500	x42
2215E	Star Map constructive algorithms, data structures, geometry, greedy, sortings	2700	x157
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	x604
2215B	RReeppeettiittiioonn binary search, brute force, implementation, math, number theory	2000	x965
2215A	Interval Mod constructive algorithms, dp, greedy, math	1700	x2359
2214J	Special Problem *special problem, brute force, games, interactive		x3534
2214I	You Are a Robot special problem, special problem		x295
2214H	Double Vision *special problem		x1595
2214G	Anomaly *special problem, communication		x716
2214F	Numbers *special problem		x928
2214E	Shortest Paths *special problem, shortest paths		x1042
2214D	Neural Feud *special problem, strings		x4258
2214C	And? *special problem, bitmasks		x1810
2214B	Are You Smiling? special problem, special problem, *special problem, strings		x6530
2214A	Odd One Out *special problem, graph matchings, implementation		x10090
2211H	Median Deletion	3500	x98
2211G	Rational Bubble Sort constructive algorithms, geometry, greedy	2900	x275
2211F	Learning Binary Search combinatorics, divide and conquer, dp, math	2400	x905
2211E	Minimum Path Cover brute force, dp, greedy, interactive, interactive, math, number theory, trees	2500	x845
2211D	AND-array bitmasks, combinatorics, math	1900	x2867
2211C2	Equal Multisets (Hard Version) constructive algorithms, dsu, greedy	1800	x3641
2211C1	Equal Multisets (Easy Version) binary search, brute force, greedy, two pointers	1300	x9006
2211B	Mickey Mouse Constructive constructive algorithms, dp, greedy, math	1100	x11529
2211A	Antimedian Deletion implementation, math	800	x15933
2210F	A Simple Problem binary search, data structures, greedy, math, trees	2700	x210
2210E	Binary Strings are Simple? constructive algorithms, implementation, interactive, number theory	2700	x314
2210D	A Simple RBS Problem constructive algorithms, math, strings, trees	2100	x2007
2210C2	A Simple GCD Problem (Hard Version) dp, greedy, number theory	2100	x2127
2210C1	A Simple GCD Problem (Easy Version) greedy, number theory	1200	x12671
2210B	Simply Sitting on Chairs data structures, greedy	900	x17408
2210A	A Simple Sequence constructive algorithms, dp, greedy, number theory	800	x22067
2209F	Dynamic Values And Maximum Sum data structures, data structures, greedy, implementation, trees	2700	x411
2209E	A Trivial String Problem brute force, dp, hashing, string suffix structures, strings	2200	x1740
2209D	Ghostfires constructive algorithms, greedy	1800	x5287
2209C	Find the Zero constructive algorithms, interactive	1400	x10548
2209B	Array greedy	900	x19245
2209A	Flip Flops greedy	800	x21347
2208E	Counting Cute Arrays combinatorics, dp	2700	x419
2208D2	Tree Orientation (Hard Version) dfs and similar, dsu, graphs, greedy, sortings, trees	2200	x1817
2208D1	Tree Orientation (Easy Version) constructive algorithms, dfs and similar, dsu, graphs, greedy, matrices, trees	1800	x4178
2208C	Stamina and Tasks dp, greedy, math	1300	x10982
2208B	Cyclists brute force, games, greedy, implementation, math, sortings	1100	x13580
2208A	Bingo Candies constructive algorithms, math	800	x20061

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