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
2149A	Be Positive math	800	x40838
2148G	Farmer John's Last Wish binary search, data structures, math, number theory	1900	x4188
2148F	Gravity Falls greedy, implementation, sortings	1800	x6579
2148E	Split binary search, data structures, two pointers	1200	x14019
2148D	Destruction of the Dandelion Fields constructive algorithms, greedy, sortings	1000	x26696
2148C	Pacer greedy, math	900	x25308
2148B	Lasers geometry	800	x33004
2148A	Sublime Sequence brute force, hashing, math	800	x47351
2147I2	Longest Increasing Path (Hard Version) constructive algorithms, math	3500	x104
2147I1	Longest Increasing Path (Easy Version) constructive algorithms, math	3300	x134
2147H	Maxflow GCD Coloring constructive algorithms, flows, graphs	3500	x188
2147G	Modular Tetration combinatorics, math, number theory	3100	x359
2147F	Exchange Queries combinatorics, data structures, greedy	2800	x663
2147E	Maximum OR Popcount binary search, bitmasks, brute force, data structures, greedy	2300	x2116
2147D	Game on Array games, greedy	1700	x7469
2147C	Rabbits constructive algorithms, dp, greedy, implementation	1500	x9728
2147B	Multiple Construction constructive algorithms	1000	x16937
2147A	Shortest Increasing Path constructive algorithms, greedy	800	x18618
2146F	Bubble Sort brute force, combinatorics, dp	2900	x301
2146E	Yet Another MEX Problem brute force, constructive algorithms, data structures, divide and conquer, greedy, hashing	2300	x2051
2146D2	Max Sum OR (Hard Version) bitmasks, constructive algorithms, divide and conquer, greedy	2000	x4029
2146D1	Max Sum OR (Easy Version) bitmasks, constructive algorithms, divide and conquer, greedy, trees	1500	x10437
2146C	Wrong Binary Search binary search, constructive algorithms	1300	x13296
2146B	Merging the Sets greedy, implementation	1100	x15906
2146A	Equal Occurrences brute force, greedy, implementation	800	x21822
2145G	Cost of Coloring combinatorics, divide and conquer, dp, fft, math	2900	x523
2145F	Long Journey dfs and similar, divide and conquer, dp, graphs, greedy, math, matrices, number theory	2500	x981
2145E	Predicting Popularity binary search, data structures, greedy, sortings	2100	x3062
2145D	Inversion Value of a Permutation constructive algorithms, dfs and similar, dp	1800	x6657
2145C	Monocarp's String binary search, greedy, strings	1300	x15382
2145B	Deck of Cards greedy, implementation	1000	x21521
2145A	Candies for Nephews math	800	x30717
2144F	Bracket Groups brute force, constructive algorithms, dp, string suffix structures, strings	2700	x917
2144E2	Looking at Towers (difficult version) combinatorics, data structures, dp	2500	x1435
2144E1	Looking at Towers (easy version) combinatorics, dp	2200	x2555
2144D	Price Tags brute force, dp, math	1800	x6994
2144C	Non-Descending Arrays combinatorics, dp, math	1300	x14970
2144B	Maximum Cost Permutation constructive algorithms, greedy	1000	x18454
2144A	Cut the Array brute force, constructive algorithms, math, number theory	800	x21668
2143F	Increasing Xor bitmasks, data structures, math	2700	x422
2143E	Make Good constructive algorithms, greedy, math, strings	2400	x1914
2143D2	Inversion Graph Coloring (Hard Version) binary search, combinatorics, data structures, dp, two pointers	2200	x2763
2143D1	Inversion Graph Coloring (Easy Version) combinatorics, data structures, dp, greedy, two pointers	1800	x6389
2143C	Max Tree constructive algorithms, dfs and similar, graphs, greedy	1300	x14080
2143B	Discounts greedy, sortings, two pointers	1000	x20889
2143A	All Lengths Subtraction brute force, two pointers	800	x20687
2141I	Color the Tree *special problem	3500	x56
2141H	Merging Vertices in a Graph *special problem, dfs and similar, dsu, graphs	2700	x84
2141G	Good Robot Paths *special problem, data structures, geometry, sortings	2800	x62
2141F	Array Reduction *special problem, greedy	2200	x141
2141E	Perfect Cut *special problem, dp, greedy	2100	x257
2141D	Avoid Minimums *special problem, greedy, math	1800	x472
2141C	Minimum on Subarrays *special problem, brute force	1800	x344
2141B	Games *special problem, greedy	1200	x1428
2141A	Furniture Store *special problem, implementation	800	x1605
2140F	Sum Minimisation number theory	2900	x313
2140E2	Prime Gaming (Hard Version) bitmasks, combinatorics, dp, probabilities	2500	x1235
2140E1	Prime Gaming (Easy Version) bitmasks, combinatorics, dp	2200	x2106
2140D	A Cruel Segment's Thesis data structures, greedy, sortings	2000	x4885
2140C	Ultimate Value data structures, games, greedy	1500	x12359
2140B	Another Divisibility Problem constructive algorithms, math, number theory	900	x22107
2140A	Shift Sort greedy, sortings	800	x22244
2139B	Cake Collection greedy	800	x20812
2139A	Maple and Multiplication greedy, math	800	x25802
2138F	Ode to the Bridge Builder constructive algorithms, geometry	3500	x82
2138E2	Determinant Construction (Hard Version) brute force, constructive algorithms, math, matrices, number theory	3100	x184
2138E1	Determinant Construction (Easy Version) brute force, constructive algorithms, math, matrices, number theory	3100	x239
2138D	Antiamuny and Slider Movement brute force, combinatorics, implementation, math, sortings	2600	x640
2138C2	Maple and Tree Beauty (Hard Version) bitmasks, brute force, dfs and similar, dp, fft, trees	2000	x3365
2138C1	Maple and Tree Beauty (Easy Version) brute force, dfs and similar, dp, graphs, trees	1800	x5420
2138B	Antiamuny Wants to Learn Swap data structures, greedy, two pointers	1900	x5321
2138A	Cake Assignment bitmasks, constructive algorithms, greedy	1100	x16982
2137G	Cry Me a River dfs and similar, dp, games, graphs	2200	x1930
2137F	Prefix Maximum Invariance binary search, combinatorics, data structures, sortings	1900	x4051
2137E	Mexification brute force, implementation, math	1500	x10150
2137D	Replace with Occurrences constructive algorithms	1200	x19516
2137C	Maximum Even Sum brute force, greedy, implementation, math	1100	x22885
2137B	Fun Permutation constructive algorithms, math, number theory	900	x26435
2137A	Collatz Conjecture constructive algorithms, math	800	x35275
2136B	Like the Bitset constructive algorithms, greedy, two pointers	900	x20910
2136A	In the Dream greedy, math	800	x26097
2135F	To the Infinity data structures, hashing, math, trees	3500	x246
2135E2	Beyond the Palindrome (Hard Version) combinatorics, dp, math, number theory	3500	x164
2135E1	Beyond the Palindrome (Easy Version) combinatorics, dp, math	3300	x246
2135D2	From the Unknown (Hard Version) brute force, constructive algorithms, interactive, math	2500	x989
2135D1	From the Unknown (Easy Version) constructive algorithms, interactive, math	2100	x2433
2135C	By the Assignment binary search, bitmasks, combinatorics, dfs and similar, dsu, graphs, math	2000	x3881
2135B	For the Champion constructive algorithms, interactive, math	1700	x7330
2135A	Against the Difference data structures, dp	1200	x18310
2134F	Permutation Oddness combinatorics, dp, math	2900	x647
2134E	Power Boxes constructive algorithms, dp, implementation, interactive	2300	x2389
2134D	Sliding Tree constructive algorithms, dfs and similar, greedy, implementation, trees	2300	x3638
2134C	Even Larger brute force, greedy, implementation	1200	x18652
2134B	Add 0 or K constructive algorithms, math, number theory	1200	x20845
2134A	Painting With Two Colors constructive algorithms, implementation, math	800	x26530
2133F	Flint and Steel data structures, dp, graphs	3000	x464
2133E	I Yearned For The Mines constructive algorithms, dfs and similar, dp, greedy, trees	2500	x1685
2133D	Chicken Jockey dp, greedy	1900	x7476
2133C	The Nether graphs, interactive	1400	x12781
2133B	Villagers greedy	800	x25508

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