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
2027E2	Bit Game (Hard Version) bitmasks, dp, math	3100	x110
2027E1	Bit Game (Easy Version) bitmasks, brute force, games, math	2800	x248
2027D2	The Endspeaker (Hard Version) binary search, data structures, dp, greedy, implementation, two pointers	2200	x1901
2027D1	The Endspeaker (Easy Version) binary search, dp, graphs, greedy, implementation, two pointers	1700	x6960
2027C	Add Zeros brute force, data structures, dfs and similar, dp, graphs, greedy	1500	x13669
2027B	Stalin Sort brute force, greedy	1100	x17708
2027A	Rectangle Arrangement geometry, implementation, math	800	x22021
2026F	Bermart Ice Cream data structures, dfs and similar, divide and conquer, dp, implementation, trees	2700	x397
2026E	Best Subsequence bitmasks, dfs and similar, flows, graph matchings, graphs	2500	x2012
2026D	Sums of Segments binary search, data structures, dp, implementation, math	1900	x5851
2026C	Action Figures binary search, brute force, constructive algorithms, data structures, greedy, implementation	1500	x12621
2026B	Black Cells binary search, brute force, constructive algorithms, greedy	1300	x16499
2026A	Perpendicular Segments constructive algorithms, geometry, greedy, math	900	x20259
2025G	Variable Damage data structures, flows	3000	x230
2025F	Choose Your Queries constructive algorithms, dfs and similar, dp, graphs, greedy, trees	2700	x1056
2025E	Card Game combinatorics, dp, fft, greedy, math	2200	x2359
2025D	Attribute Checks brute force, data structures, dp, implementation, math, two pointers	1800	x7873
2025C	New Game binary search, brute force, greedy, implementation, sortings, two pointers	1300	x19024
2025B	Binomial Coefficients, Kind Of combinatorics, dp, math	1100	x19608
2025A	Two Screens binary search, greedy, strings, two pointers	800	x28555
2024B	Buying Lemonade binary search, constructive algorithms, sortings	1100	x17038
2024A	Profitable Interest Rate greedy, math	800	x23010
2023F	Hills and Pits data structures, greedy, math, matrices	3500	x132
2023E	Tree of Life dp, greedy, trees	3300	x176
2023D	Many Games brute force, dp, greedy, math, probabilities	2900	x604
2023C	C+K+S constructive algorithms, dfs and similar, graphs, greedy, hashing, implementation, strings	2400	x1373
2023B	Skipping binary search, dp, graphs, shortest paths	1700	x7069
2023A	Concatenation of Arrays constructive algorithms, greedy, math, sortings	1300	x16563
2022E2	Billetes MX (Hard Version) binary search, combinatorics, data structures, dsu, graphs	2600	x707
2022E1	Billetes MX (Easy Version) 2-sat, binary search, combinatorics, constructive algorithms, dfs and similar, dsu, graphs	2500	x759
2022D2	Asesino (Hard Version) constructive algorithms, dp, interactive	2700	x826
2022D1	Asesino (Easy Version) binary search, brute force, constructive algorithms, implementation, interactive	1900	x4004
2022C	Gerrymandering dp, implementation	1800	x6398
2022B	Kar Salesman binary search, greedy, math	1300	x14519
2022A	Bus to Pénjamo constructive algorithms, greedy, implementation, math	800	x17226
2021E3	Digital Village (Extreme Version) data structures, dfs and similar, dp, dsu, graphs, greedy, math, trees	2800	x678
2021E2	Digital Village (Hard Version) data structures, dp, dsu, graphs, math, trees	2500	x1207
2021E1	Digital Village (Easy Version) brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees	2300	x1928
2021D	Boss, Thirsty dp, greedy, implementation	2500	x956
2021C2	Adjust The Presentation (Hard Version) constructive algorithms, data structures, greedy, implementation, sortings	1900	x4504
2021C1	Adjust The Presentation (Easy Version) constructive algorithms, greedy	1300	x14113
2021B	Maximize Mex brute force, greedy, math, number theory	1200	x18804
2021A	Meaning Mean data structures, greedy, math, sortings	800	x21497
2020F	Count Leaves dp, math, number theory	2900	x266
2020E	Expected Power bitmasks, dp, math, probabilities	2000	x3983
2020D	Connect the Dots brute force, dp, dsu, graphs, math, trees	1800	x7417
2020C	Bitwise Balancing bitmasks, hashing, implementation, math, schedules, ternary search	1400	x18286
2020B	Brightness Begins binary search, math	1200	x21657
2020A	Find Minimum Operations bitmasks, brute force, greedy, math, number theory	800	x25930
2019B	All Pairs Segments implementation, math	1200	x17275
2019A	Max Plus Size brute force, dp, greedy	800	x27130
2018F3	Speedbreaker Counting (Hard Version) dp, greedy, math	3100	x308
2018F2	Speedbreaker Counting (Medium Version) dp, greedy, math	3000	x286
2018F1	Speedbreaker Counting (Easy Version) combinatorics, dp, greedy, math	2900	x328
2018E2	Complex Segments (Hard Version) binary search, data structures, divide and conquer, dsu, greedy, math, sortings	3400	x204
2018E1	Complex Segments (Easy Version) binary search, data structures, divide and conquer, dsu, greedy, math, sortings	3300	x239
2018D	Max Plus Min Plus Size data structures, dp, dsu, greedy, implementation, matrices, sortings	2200	x2191
2018C	Tree Pruning brute force, dfs and similar, greedy, sortings, trees	1700	x9625
2018B	Speedbreaker binary search, data structures, dp, greedy, implementation, two pointers	1900	x5183
2018A	Cards Partition 2-sat, brute force, greedy, implementation, math	1600	x12610
2014H	Robin Hood Archery data structures, divide and conquer, greedy, hashing	1900	x5667
2014G	Milky Days brute force, data structures, greedy, implementation	2200	x1797
2014F	Sheriff's Defense dfs and similar, dp, greedy, trees	2000	x5091
2014E	Rendez-vous de Marian et Robin dfs and similar, graphs, shortest paths	1800	x8711
2014D	Robert Hood and Mrs Hood brute force, data structures, greedy, sortings	1400	x15967
2014C	Robin Hood in Town binary search, greedy, math	1100	x27443
2014B	Robin Hood and the Major Oak math	800	x33176
2014A	Robin Helps greedy, implementation	800	x45672
2013F2	Game in Tree (Hard Version) binary search, data structures, trees	3500	x160
2013F1	Game in Tree (Easy Version) binary search, brute force, data structures, dp, games, greedy, implementation, trees	2700	x651
2013E	Prefix GCD brute force, dp, greedy, math, number theory	2200	x4215
2013D	Minimize the Difference binary search, greedy	1900	x7464
2013C	Password Cracking constructive algorithms, interactive, strings	1400	x14565
2013B	Battle for Survive constructive algorithms, greedy, math	900	x28230
2013A	Zhan's Blender constructive algorithms, math	800	x31222
2011I	Stack and Queue *special problem, data structures, divide and conquer		x23
2011H	Strange Matrix *special problem, graphs, greedy		x57
2011G	Removal of a Permutation *special problem		x50
2011F	Good Subarray *special problem, data structures, greedy		x131
2011E	Rock-Paper-Scissors Bot *special problem, greedy, strings		x182
2011D	Among Wolves *special problem		x283
2011C	Split the Expression *special problem		x380
2011B	Shuffle *special problem		x677
2011A	Problem Solving *special problem		x1138
2010C2	Message Transmission Error (hard version) hashing, string suffix structures, strings, two pointers	1700	x4578
2010C1	Message Transmission Error (easy version) brute force, strings	1400	x9241
2010B	Three Brothers brute force, implementation, math	800	x24711
2010A	Alternating Sum of Numbers brute force, implementation, math	800	x21258
2009G3	Yunli's Subarray Queries (extreme version) data structures, dp, implementation	2700	x531
2009G2	Yunli's Subarray Queries (hard version) binary search, data structures, dp	2200	x1750
2009G1	Yunli's Subarray Queries (easy version) binary search, data structures, two pointers	1900	x5360
2009F	Firefly's Queries bitmasks, data structures, flows, math	1700	x8485
2009E	Klee's SUPER DUPER LARGE Array!!! binary search, math, ternary search	1400	x17653
2009D	Satyam and Counting geometry, math	1400	x18763
2009C	The Legend of Freya the Frog implementation, math	1100	x32991
2009B	osu!mania brute force, implementation	800	x53182
2009A	Minimize! brute force, math	800	x72887
2008H	Sakurako's Test binary search, brute force, greedy, math, number theory	2100	x3601
2008G	Sakurako's Task binary search, greedy, math, number theory	1800	x6667
2008F	Sakurako's Box combinatorics, math, number theory	1400	x15657

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