Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
4 days
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Problems

#	Name
2133A	Redstone? brute force, data structures, implementation, math	800	x30951
2132G	Famous Choreographer hashing, implementation, strings	2600	x514
2132F	Rada and the Chamomile Valley dfs and similar, graphs, shortest paths	2100	x2768
2132E	Arithmetics Competition binary search, data structures, greedy, sortings, ternary search	1700	x7580
2132D	From 1 to Infinity binary search, dp, implementation, math	1600	x8810
2132C2	The Cunning Seller (hard version) binary search, greedy, math	1400	x13320
2132C1	The Cunning Seller (easy version) greedy, math	1000	x27713
2132B	The Secret Number math	900	x33518
2132A	Homework brute force, implementation, strings	800	x43308
2131H	Sea, You & copriMe brute force, constructive algorithms, graphs, greedy, math, number theory	2600	x883
2131G	Wafu! bitmasks, brute force, data structures, dfs and similar, dp, math	2000	x3766
2131F	Unjust Binary Life binary search, data structures, greedy, greedy, math, sortings, two pointers	1900	x4713
2131E	Adjacent XOR brute force, greedy	1400	x17100
2131D	Arboris Contractio data structures, graphs, greedy, trees	1400	x14300
2131C	Make it Equal math, number theory	1100	x21598
2131B	Alternating Series constructive algorithms, greedy, math	800	x30935
2131A	Lever math	800	x38835
2130B	Pathless constructive algorithms	1100	x21380
2130A	Submission is All You Need greedy, math	800	x28514
2129F2	Top-K Tracker (Hard Version) interactive, interactive	3500	x96
2129F1	Top-K Tracker (Easy Version) interactive	3500	x133
2129E	Induced Subgraph Queries data structures, graphs, sortings	3000	x475
2129D	Permutation Blackhole brute force, combinatorics, dp, implementation, math	2600	x944
2129C3	Interactive RBS (Hard Version) binary search, bitmasks, constructive algorithms, dp, interactive	2300	x1661
2129C2	Interactive RBS (Medium Version) binary search, bitmasks, constructive algorithms, interactive	2000	x2500
2129C1	Interactive RBS (Easy Version) binary search, bitmasks, constructive algorithms, interactive	1900	x3854
2129B	Stay or Mirror brute force, data structures, dp, greedy, sortings	1600	x13246
2129A	Double Perspective constructive algorithms, dp, dsu, graphs, greedy, sortings	1300	x16625
2128F	Strict Triangle graphs, greedy, shortest paths	3200	x378
2128E2	Submedians (Hard Version) binary search, constructive algorithms, data structures, math, two pointers	2600	x795
2128E1	Submedians (Easy Version) binary search, data structures, dp, greedy, math	1900	x6539
2128D	Sum of LDS brute force, combinatorics, dp, greedy, math	1600	x12271
2128C	Leftmost Below greedy, math	1200	x20567
2128B	Deque Process constructive algorithms, greedy, sortings, two pointers	1100	x21400
2128A	Recycling Center greedy, sortings	800	x28465
2127H	23 Rises Again brute force, dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation, probabilities, trees	3100	x570
2127G2	Inter Active (Hard Version) binary search, bitmasks, constructive algorithms, graphs, implementation, interactive, math, probabilities	3500	x107
2127G1	Inter Active (Easy Version) binary search, constructive algorithms, interactive, probabilities	3400	x101
2127F	Hamed and AghaBalaSar brute force, combinatorics, dp, math, probabilities	2800	x1057
2127E	Ancient Tree constructive algorithms, data structures, dfs and similar, dsu, greedy, trees	2100	x2737
2127D	Root was Built by Love, Broken by Destiny combinatorics, dfs and similar, graphs, trees	1800	x6178
2127C	Trip Shopping games, greedy, sortings	1400	x12366
2127B	Hamiiid, Haaamid... Hamid? games, greedy	1300	x13483
2127A	Mix Mex Max constructive algorithms, greedy, math	800	x19634
2126G2	Big Wins! (hard version) binary search, data structures, divide and conquer, dsu, trees, two pointers	2400	x1160
2126G1	Big Wins! (easy version) binary search, data structures, dp, dsu, two pointers	2200	x2479
2126F	1-1-1, Free Tree! brute force, data structures, dfs and similar, graphs, implementation, trees	2000	x4295
2126E	G-C-D, Unlucky! math, number theory	1400	x16994
2126D	This Is the Last Time data structures, greedy, sortings	1200	x23974
2126C	I Will Definitely Make It greedy, sortings	1100	x26251
2126B	No Casino in the Mountains dp, greedy	800	x37657
2126A	Only One Digit brute force, implementation, math	800	x51012
2125F	Timofey and Docker binary search, divide and conquer, dp	3000	x397
2125E	Sets of Complementary Sums brute force, combinatorics, dp, math, two pointers	2500	x1415
2125D	Segments Covering dp, math, probabilities	1600	x9259
2125C	Count Good Numbers bitmasks, combinatorics, math, number theory	1100	x22731
2125B	Left and Down math, number theory	900	x27341
2125A	Difficult Contest constructive algorithms, implementation, sortings, strings	800	x27958
2124I	Lexicographic Partition constructive algorithms, math, trees	3500	x203
2124H	Longest Good Subsequence dp, math, trees	3400	x188
2124G	Maximise Sum binary search, data structures	3200	x301
2124F2	Appending Permutations (Hard Version) combinatorics, dp	2800	x567
2124F1	Appending Permutations (Easy Version) combinatorics, dp	2300	x1556
2124E	Make it Zero constructive algorithms, greedy, math	2100	x3823
2124D	Make a Palindrome greedy, sortings, two pointers	1700	x8085
2124C	Subset Multiplication constructive algorithms, greedy, math, number theory	1300	x14580
2124B	Minimise Sum greedy	1000	x20252
2124A	Deranged Deletions greedy, sortings	800	x19191
2123G	Modular Sorting brute force, data structures, greedy, math, number theory, sortings	2100	x3246
2123F	Minimize Fixed Points constructive algorithms, number theory	1700	x9752
2123E	MEX Count binary search, data structures, greedy, sortings, two pointers	1400	x14886
2123D	Binary String Battle constructive algorithms, games, greedy	1200	x21867
2123C	Prefix Min and Suffix Max brute force, data structures	1000	x30849
2123B	Tournament greedy	800	x34876
2123A	Blackboard Game math	800	x41652
2122G	Tree Parking combinatorics, fft, math, trees	3300	x303
2122F	Colorful Polygon constructive algorithms, divide and conquer, geometry	3400	x129
2122E	Greedy Grid Counting combinatorics, dp, greedy, math	2600	x1075
2122D	Traffic Lights brute force, data structures, divide and conquer, dp, graphs, greedy, shortest paths	2400	x2467
2122C	Manhattan Pairs constructive algorithms, geometry, greedy, math, sortings	1700	x8382
2122B	Pile Shuffling greedy, math	1100	x15205
2122A	Greedy Grid constructive algorithms, greedy	800	x19192
2121H	Ice Baby binary search, brute force, data structures, dp, implementation, sortings	2300	x2236
2121G	Gangsta data structures, divide and conquer, math, sortings	1900	x5357
2121F	Yamakasi binary search, brute force, data structures, greedy, two pointers	1800	x8114
2121E	Sponsor of Your Problems dp, greedy, implementation, strings	1500	x14669
2121D	1709 implementation, sortings	1300	x18194
2121C	Those Who Are With Us greedy, greedy, implementation	1200	x21726
2121B	Above the Clouds constructive algorithms, greedy, strings	800	x32485
2121A	Letter Home brute force, math	800	x39251
2120G	Eulerian Line Graph graphs, greedy, math	3000	x108
2120F	Superb Graphs 2-sat, graphs	2600	x475
2120E	Lanes of Cars binary search, dp, ternary search	2300	x1868
2120D	Matrix game combinatorics, math	1800	x5770
2120C	Divine Tree constructive algorithms, greedy, math, sortings, trees	1400	x12583
2120B	Square Pool geometry	1000	x17727
2120A	Square of Rectangles geometry, math	800	x20315
2119F	Volcanic Eruptions dfs and similar, dp, greedy, shortest paths, trees	3300	x173
2119E	And Constraint bitmasks, dp, greedy	2600	x704
2119D	Token Removing combinatorics, dp, math	2100	x3465

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