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)
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Problems

#	Name
2171F	Rae Taylor and Trees (hard version) binary search, constructive algorithms, data structures, dp, dsu, greedy, implementation, trees	1600	x7117
2171D	Rae Taylor and Trees (easy version) binary search, data structures, dp, dsu, greedy, implementation, trees	1400	x11563
2170F	Build XOR on a Segment bitmasks, dp	2600	x777
2170E	Binary Strings and Blocks combinatorics, data structures, dp	2100	x2317
2169F	Subsequence Problem combinatorics, dp, fft, math	2700	x333
2169E	Points Selection dp, greedy	2400	x1041
2169C	Range Operation dp, greedy, math, two pointers	1300	x12656
2167G	Mukhammadali and the Smooth Array data structures, dp	1600	x11010
2167F	Tree, TREE!!! dfs and similar, dp, math, trees	1600	x7123
2165E	Rainbow Branch constructive algorithms, dp, greedy, trees	3200	x255
2165B	Marble Council dp, math, sortings	1900	x4530
2164F2	Chain Prefix Rank (Hard Version) binary search, combinatorics, data structures, dfs and similar, dp, graphs, math, trees	2900	x422
2164F1	Chain Prefix Rank (Easy Version) combinatorics, dfs and similar, dp, math, trees	2600	x649
2163C	Monopati brute force, combinatorics, dp, math, two pointers	1500	x9015
2162H	Beautiful Problem dp	2900	x313
2161D	Locked Out binary search, data structures, dp, greedy	2100	x2770
2159D2	Inverse Minimum Partition (Hard Version) dp, greedy, math	3200	x394
2159D1	Inverse Minimum Partition (Easy Version) binary search, brute force, dp, geometry, greedy, math, two pointers	2500	x1019
2159B	Rectangles brute force, data structures, dp, dsu, greedy, implementation, two pointers	2100	x2308
2158C	Annoying Game dp, games, greedy	1400	x11044
2157I	Hyper Smawk Bros dp, dp, games	3500	x171
2157G	Isaac's Queries bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities	2800	x411
2157E	Adjusting Drones binary search, brute force, data structures, dp, dsu, greedy, implementation, sortings	1900	x3568
2156E	Best Time to Buy and Sell Stock binary search, brute force, data structures, dp, games, graphs, greedy	2500	x959
2154F2	Bombing (Hard Version) combinatorics, dp	3300	x175
2153D	Not Alone dp, greedy	1800	x6285
2152H1	Victorious Coloring (Easy Version) dfs and similar, dp, greedy	2900	x610
2150D	Attraction Theory combinatorics, dp, math	2700	x752
2150C	Limited Edition Shop data structures, dp	2100	x2653
2147C	Rabbits constructive algorithms, dp, greedy, implementation	1500	x9736
2146F	Bubble Sort brute force, combinatorics, dp	2900	x302
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
2145D	Inversion Value of a Permutation constructive algorithms, dfs and similar, dp	1800	x6658
2144F	Bracket Groups brute force, constructive algorithms, dp, string suffix structures, strings	2700	x918
2144E2	Looking at Towers (difficult version) combinatorics, data structures, dp	2500	x1436
2144E1	Looking at Towers (easy version) combinatorics, dp	2200	x2556
2144D	Price Tags brute force, dp, math	1800	x6997
2144C	Non-Descending Arrays combinatorics, dp, math	1300	x14978
2143D2	Inversion Graph Coloring (Hard Version) binary search, combinatorics, data structures, dp, two pointers	2200	x2768
2143D1	Inversion Graph Coloring (Easy Version) combinatorics, data structures, dp, greedy, two pointers	1800	x6392
2141E	Perfect Cut *special problem, dp, greedy	2100	x257
2140E2	Prime Gaming (Hard Version) bitmasks, combinatorics, dp, probabilities	2500	x1237
2140E1	Prime Gaming (Easy Version) bitmasks, combinatorics, dp	2200	x2108
2138C2	Maple and Tree Beauty (Hard Version) bitmasks, brute force, dfs and similar, dp, fft, trees	2000	x3366
2138C1	Maple and Tree Beauty (Easy Version) brute force, dfs and similar, dp, graphs, trees	1800	x5423
2137G	Cry Me a River dfs and similar, dp, games, graphs	2200	x1931
2135E2	Beyond the Palindrome (Hard Version) combinatorics, dp, math, number theory	3500	x166
2135E1	Beyond the Palindrome (Easy Version) combinatorics, dp, math	3300	x247
2135A	Against the Difference data structures, dp	1200	x18322
2134F	Permutation Oddness combinatorics, dp, math	2900	x647
2134E	Power Boxes constructive algorithms, dp, implementation, interactive	2300	x2395
2133F	Flint and Steel data structures, dp, graphs	3000	x465
2133E	I Yearned For The Mines constructive algorithms, dfs and similar, dp, greedy, trees	2500	x1690
2133D	Chicken Jockey dp, greedy	1900	x7480
2132D	From 1 to Infinity binary search, dp, implementation, math	1600	x8814
2131G	Wafu! bitmasks, brute force, data structures, dfs and similar, dp, math	2000	x3770
2129D	Permutation Blackhole brute force, combinatorics, dp, implementation, math	2600	x944
2129C3	Interactive RBS (Hard Version) binary search, bitmasks, constructive algorithms, dp, interactive	2300	x1663
2129B	Stay or Mirror brute force, data structures, dp, greedy, sortings	1600	x13252
2129A	Double Perspective constructive algorithms, dp, dsu, graphs, greedy, sortings	1300	x16634
2128E1	Submedians (Easy Version) binary search, data structures, dp, greedy, math	1900	x6540
2128D	Sum of LDS brute force, combinatorics, dp, greedy, math	1600	x12278
2127H	23 Rises Again brute force, dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation, probabilities, trees	3100	x570
2127F	Hamed and AghaBalaSar brute force, combinatorics, dp, math, probabilities	2800	x1057
2126G1	Big Wins! (easy version) binary search, data structures, dp, dsu, two pointers	2200	x2479
2126B	No Casino in the Mountains dp, greedy	800	x37667
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	x1416
2125D	Segments Covering dp, math, probabilities	1600	x9270
2124H	Longest Good Subsequence dp, math, trees	3400	x188
2124F2	Appending Permutations (Hard Version) combinatorics, dp	2800	x567
2124F1	Appending Permutations (Easy Version) combinatorics, dp	2300	x1557
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	x2469
2121H	Ice Baby binary search, brute force, data structures, dp, implementation, sortings	2300	x2240
2121E	Sponsor of Your Problems dp, greedy, implementation, strings	1500	x14678
2120E	Lanes of Cars binary search, dp, ternary search	2300	x1868
2119F	Volcanic Eruptions dfs and similar, dp, greedy, shortest paths, trees	3300	x173
2119E	And Constraint bitmasks, dp, greedy	2600	x705
2119D	Token Removing combinatorics, dp, math	2100	x3467
2118D2	Red Light, Green Light (Hard version) binary search, brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory	2200	x2497
2118D1	Red Light, Green Light (Easy version) brute force, dfs and similar, dp, graphs, implementation, number theory	1700	x8452
2115E	Gellyfish and Mayflower dp, graphs	3500	x236
2115D	Gellyfish and Forget-Me-Not bitmasks, dp, games, greedy, math	2900	x1101
2115C	Gellyfish and Eternal Violet combinatorics, dp, greedy, math, probabilities	2700	x913
2115B	Gellyfish and Camellia Japonica brute force, constructive algorithms, dfs and similar, dp, graphs, greedy, trees	2100	x3973
2115A	Gellyfish and Flaming Peony constructive algorithms, dp, math, number theory	1500	x14941
2114G	Build an Array brute force, constructive algorithms, dp, greedy, math, number theory	2200	x2038
2114F	Small Operations binary search, brute force, dfs and similar, dp, math, number theory, sortings	2000	x5501
2114E	Kirei Attacks the Estate dfs and similar, dp, greedy, trees	1400	x13992
2114C	Need More Arrays dp, greedy	1000	x30879
2112E	Tree Colorings combinatorics, dfs and similar, dp, graphs, math, number theory, trees	2200	x3378
2111B	Fibonacci Cubes brute force, dp, implementation, math	1100	x17881
2110D	Fewer Batteries binary search, dfs and similar, dp, graphs, greedy, hashing	1700	x8602
2109E	Binary String Wowee combinatorics, dp, strings	2400	x1792
2108C	Neo's Escape binary search, brute force, data structures, dp, dsu, graphs, greedy, implementation	1500	x14680
2107F2	Cycling (Hard Version) binary search, brute force, data structures, dp, greedy	2800	x506
2107F1	Cycling (Easy Version) binary search, brute force, dp, greedy	2300	x1821
2107C	Maximum Subarray Sum binary search, constructive algorithms, dp, implementation, math	1500	x12087

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