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)
3 days
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Problems

#	Name
2222E	Seek the Truth binary search, bitmasks, constructive algorithms, interactive		x1898
2219B2	Unique Values (Hard version) binary search, bitmasks, constructive algorithms, interactive		x3166
2219B1	Unique Values (Easy version) binary search, constructive algorithms, divide and conquer, interactive, math		x3554
2215C	Oriented Journey bitmasks, brute force, communication, constructive algorithms, graphs, interactive, trees	2200	x609
2214J	Special Problem *special problem, brute force, games, interactive		x3536
2211E	Minimum Path Cover brute force, dp, greedy, interactive, interactive, math, number theory, trees	2500	x849
2210E	Binary Strings are Simple? constructive algorithms, implementation, interactive, number theory	2700	x315
2209C	Find the Zero constructive algorithms, interactive	1400	x10578
2207H3	Bowser's Castle (Hard Version) constructive algorithms, divide and conquer, interactive, trees, two pointers		x56
2207H2	Bowser's Castle (Medium Version) constructive algorithms, divide and conquer, interactive, trees, two pointers		x39
2207H1	Bowser's Castle (Easy Version) binary search, constructive algorithms, divide and conquer, greedy, interactive, trees		x51
2206A	Compare Suffixes interactive	3500	x83
2196C2	Interactive Graph (Hard Version) combinatorics, dfs and similar, dp, graphs, interactive	2000	x2513
2196C1	Interactive Graph (Simple Version) binary search, combinatorics, dfs and similar, dp, graphs, interactive	1800	x3580
2193G	Paths in a Tree dfs and similar, interactive, sortings, trees	2100	x2236
2190C	Comparable Permutations greedy, implementation, interactive, sortings, two pointers	2300	x1289
2183G	Snake Instructions constructive algorithms, greedy, interactive	3200	x221
2181C	Cacti Classification binary search, constructive algorithms, interactive, math	3200	x147
2179G	Blackslex and Penguin Migration brute force, interactive, math	2200	x1207
2179F	Blackslex and Another RGB Walking communication, constructive algorithms, graphs, interactive, number theory, trees	2000	x2745
2178E	Flatten or Concatenate binary search, divide and conquer, interactive	2000	x3684
2174E2	Game of Scientists (Version 2) binary search, chinese remainder theorem, dfs and similar, interactive, math	3200	x97
2174E1	Game of Scientists (Version 1) chinese remainder theorem, constructive algorithms, interactive, math	3100	x133
2173E	Shiro's Mirror Duel constructive algorithms, greedy, interactive, probabilities, sortings	2200	x1532
2168C	Intercepting Butterflies bitmasks, communication, constructive algorithms, graphs, interactive		x876
2168B	Locate binary search, combinatorics, communication, constructive algorithms, greedy, interactive		x1550
2168A2	Encode and Decode (Hard Version) bitmasks, communication, interactive, math		x3300
2168A1	Encode and Decode (Easy Version) communication, constructive algorithms, interactive		x5020
2164G	Pointless Machine constructive algorithms, graphs, interactive, trees	3300	x203
2163E	Plegma bitmasks, combinatorics, communication, interactive	2700	x635
2163D2	Diadrash (Hard Version) binary search, interactive, math, sortings	2500	x1495
2163D1	Diadrash (Easy Version) binary search, brute force, divide and conquer, implementation, interactive	2100	x2727
2162D	Beautiful Permutation binary search, interactive	1400	x12350
2159F	Grand Finale: Snakes binary search, interactive, ternary search	3500	x134
2159A	MAD Interactive Problem constructive algorithms, implementation, interactive	1700	x8128
2157G	Isaac's Queries bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities	2800	x410
2156D	Find the Last Number binary search, bitmasks, constructive algorithms, interactive	1900	x5369
2155D	Batteries brute force, constructive algorithms, graph matchings, graphs, interactive, math	1800	x5858
2152E	Monotone Subsequence constructive algorithms, graphs, greedy, interactive, math	2100	x2777
2150E2	Hidden Single (Version 2) binary search, divide and conquer, interactive, math, probabilities	2800	x597
2150E1	Hidden Single (Version 1) divide and conquer, interactive, math, probabilities, sortings	2600	x1025
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
2135B	For the Champion constructive algorithms, interactive, math	1700	x7334
2134E	Power Boxes constructive algorithms, dp, implementation, interactive	2300	x2395
2133C	The Nether graphs, interactive	1400	x12789
2129F2	Top-K Tracker (Hard Version) interactive, interactive	3500	x96
2129F1	Top-K Tracker (Easy Version) interactive	3500	x133
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
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
2111G	Divisible Subarrays binary search, bitmasks, brute force, data structures, interactive	2900	x398
2109C3	Hacking Numbers (Hard Version) constructive algorithms, interactive, math, number theory	2600	x3195
2109C2	Hacking Numbers (Medium Version) constructive algorithms, interactive, math, number theory	1700	x8631
2109C1	Hacking Numbers (Easy Version) bitmasks, constructive algorithms, interactive, math, number theory	1500	x11412
2108D	Needle in a Numstack binary search, brute force, implementation, interactive	2200	x2418
2106G2	Baudelaire (hard version) binary search, dfs and similar, divide and conquer, implementation, interactive, trees	2500	x609
2106G1	Baudelaire (easy version) binary search, constructive algorithms, divide and conquer, greedy, interactive, trees	2200	x1612
2096G	Wonderful Guessing Game bitmasks, constructive algorithms, interactive	3200	x421
2095B	Plinko *special problem, games, interactive		x5992
2087D	Uppercase or Lowercase? special problem, special problem, interactive		x267
2086F	Online Palindrome brute force, constructive algorithms, interactive	3000	x142
2077B	Finding OR Sum bitmasks, constructive algorithms, implementation, interactive, math	1900	x3654
2074E	Empty Triangle geometry, interactive, probabilities	1600	x6650
2073H	Secret Lilies and Roses interactive	2700	x370
2073E	Minus Operator interactive	3300	x76
2066A	Object Identification graphs, greedy, implementation, interactive	1400	x7167
2061G	Kevin and Teams constructive algorithms, graphs, interactive	2900	x494
2052H	Hunting Hoglins in Hogwarts interactive	3500	x68
2049E	Broken Queries binary search, bitmasks, brute force, constructive algorithms, implementation, interactive	2400	x1591
2038G	Guess One Character constructive algorithms, implementation, interactive	1900	x2952
2037E	Kachina's Favorite Binary String dp, greedy, interactive, two pointers	1600	x7370
2036G	Library of Magic binary search, constructive algorithms, divide and conquer, interactive, math, number theory	2200	x1669
2032D	Genokraken constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers	1800	x6199
2031F	Penchick and Even Medians binary search, constructive algorithms, interactive, probabilities	2800	x451
2022D2	Asesino (Hard Version) constructive algorithms, dp, interactive	2700	x826
2022D1	Asesino (Easy Version) binary search, brute force, constructive algorithms, implementation, interactive	1900	x4010
2013C	Password Cracking constructive algorithms, interactive, strings	1400	x14575
2001C	Guess The Tree binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees	1500	x12791
1999G2	Ruler (hard version) binary search, interactive, ternary search	1700	x11010
1999G1	Ruler (easy version) binary search, interactive	1500	x14515
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings	3500	x774
1991I	Grid Game constructive algorithms, games, graph matchings, greedy, interactive	3500	x171
1991E	Coloring Game constructive algorithms, dfs and similar, games, graphs, greedy, interactive	1900	x5120
1990E2	Catch the Mole(Hard Version) binary search, data structures, dfs and similar, divide and conquer, interactive, trees	2600	x1108
1990E1	Catch the Mole(Easy Version) binary search, data structures, dfs and similar, interactive, trees	2500	x1139
1987H	Fumo Temple interactive	3500	x140
1979F	Kostyanych's Theorem brute force, constructive algorithms, graphs, interactive	2900	x438
1977E	Tensor constructive algorithms, graphs, interactive	2600	x934
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x2256
1970D3	Arithmancy (Hard) interactive	3100	x160
1970D2	Arithmancy (Medium) constructive algorithms, interactive, probabilities, strings	2600	x309
1970D1	Arithmancy (Easy) brute force, constructive algorithms, interactive, strings	2100	x940
1939A	Draw Polygon Lines *special problem, constructive algorithms, dp, geometry, interactive		x30
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x8660
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1761
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x8071
1930H	Interactive Mex Tree constructive algorithms, dfs and similar, interactive, trees	3300	x365

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