Problemset - Codeforces

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Codeforces Round (Div. 2)
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Problems

#	Name
2273E	Six-Seven Bags brute force, greedy, interactive		x94
2273D	Aura Battle brute force, implementation, interactive, math		x229
2261H	Oh Tree Tree Tree, No Need to Leave bitmasks, communication, constructive algorithms, dfs and similar, interactive, trees		x67
2258C	Far Cities interactive, trees, two pointers	1600	x5486
2255C	Even If the World Turns communication, constructive algorithms, expression parsing, greedy, interactive, math, number theory	2100	x1684
2246E	lce4113 and Security Game bitmasks, interactive, interactive, math, probabilities	2600	x751
2245G	NPC Challenge divide and conquer, interactive	3000	x198
2237G	Send GCDs communication, constructive algorithms, interactive, math, number theory	2900	x466
2222E	Seek the Truth binary search, bitmasks, constructive algorithms, interactive	2000	x2521
2219B2	Unique Values (Hard version) binary search, bitmasks, constructive algorithms, interactive	2000	x4006
2219B1	Unique Values (Easy version) binary search, constructive algorithms, divide and conquer, interactive, math	1900	x4446
2215C	Oriented Journey bitmasks, brute force, communication, constructive algorithms, graphs, interactive, trees	2200	x939
2214J	Special Problem *special problem, brute force, games, interactive		x3743
2211E	Minimum Path Cover brute force, dp, greedy, interactive, interactive, math, number theory, trees	2500	x1098
2210E	Binary Strings are Simple? constructive algorithms, implementation, interactive, number theory	2700	x399
2209C	Find the Zero constructive algorithms, interactive	1400	x12314
2207H3	Bowser's Castle (Hard Version) constructive algorithms, divide and conquer, interactive, trees, two pointers	3500	x89
2207H2	Bowser's Castle (Medium Version) constructive algorithms, divide and conquer, interactive, trees, two pointers	3500	x83
2207H1	Bowser's Castle (Easy Version) binary search, constructive algorithms, divide and conquer, greedy, interactive, trees	3500	x83
2206A	Compare Suffixes interactive	3500	x157
2196C2	Interactive Graph (Hard Version) combinatorics, dfs and similar, dp, graphs, interactive	2000	x2871
2196C1	Interactive Graph (Simple Version) binary search, combinatorics, dfs and similar, dp, graphs, interactive	1800	x4052
2193G	Paths in a Tree dfs and similar, interactive, sortings, trees	2100	x2478
2190C	Comparable Permutations greedy, implementation, interactive, sortings, two pointers	2300	x1407
2183G	Snake Instructions constructive algorithms, greedy, interactive	3200	x256
2181C	Cacti Classification binary search, constructive algorithms, interactive, math	3200	x180
2179G	Blackslex and Penguin Migration brute force, interactive, math	2200	x1340
2179F	Blackslex and Another RGB Walking communication, constructive algorithms, graphs, interactive, number theory, trees	2000	x3018
2178E	Flatten or Concatenate binary search, divide and conquer, interactive	2000	x3839
2174E2	Game of Scientists (Version 2) binary search, chinese remainder theorem, dfs and similar, interactive, math	3200	x121
2174E1	Game of Scientists (Version 1) chinese remainder theorem, constructive algorithms, interactive, math	3100	x168
2173E	Shiro's Mirror Duel constructive algorithms, greedy, interactive, probabilities, sortings	2200	x1679
2168C	Intercepting Butterflies bitmasks, communication, constructive algorithms, graphs, interactive		x946
2168B	Locate binary search, combinatorics, communication, constructive algorithms, greedy, interactive		x1677
2168A2	Encode and Decode (Hard Version) bitmasks, communication, interactive, math		x3650
2168A1	Encode and Decode (Easy Version) communication, constructive algorithms, interactive		x5482
2164G	Pointless Machine constructive algorithms, graphs, interactive, trees	3300	x356
2163E	Plegma bitmasks, combinatorics, communication, interactive	2700	x707
2163D2	Diadrash (Hard Version) binary search, interactive, math, sortings	2500	x1625
2163D1	Diadrash (Easy Version) binary search, brute force, divide and conquer, implementation, interactive	2100	x2895
2162D	Beautiful Permutation binary search, interactive	1400	x13136
2159F	Grand Finale: Snakes binary search, interactive, ternary search	3500	x904
2159A	MAD Interactive Problem constructive algorithms, implementation, interactive	1700	x9736
2157G	Isaac's Queries bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities	2800	x996
2156D	Find the Last Number binary search, bitmasks, constructive algorithms, interactive	1900	x5665
2155D	Batteries brute force, constructive algorithms, graph matchings, graphs, interactive, math	1800	x6365
2152E	Monotone Subsequence constructive algorithms, graphs, greedy, interactive, math	2100	x4823
2150E2	Hidden Single (Version 2) binary search, divide and conquer, interactive, math, probabilities	2800	x916
2150E1	Hidden Single (Version 1) divide and conquer, interactive, math, probabilities, sortings	2600	x2937
2135D2	From the Unknown (Hard Version) brute force, constructive algorithms, interactive, math	2500	x1506
2135D1	From the Unknown (Easy Version) constructive algorithms, interactive, math	2100	x4341
2135B	For the Champion constructive algorithms, interactive, math	1700	x9495
2134E	Power Boxes constructive algorithms, dp, implementation, interactive	2300	x2566
2133C	The Nether graphs, interactive	1400	x13554
2129F2	Top-K Tracker (Hard Version) interactive, interactive	3500	x146
2129F1	Top-K Tracker (Easy Version) interactive	3500	x1030
2129C3	Interactive RBS (Hard Version) binary search, bitmasks, constructive algorithms, dp, interactive	2300	x2338
2129C2	Interactive RBS (Medium Version) binary search, bitmasks, constructive algorithms, interactive	2000	x3925
2129C1	Interactive RBS (Easy Version) binary search, bitmasks, constructive algorithms, interactive	1900	x5325
2127G2	Inter Active (Hard Version) binary search, bitmasks, constructive algorithms, graphs, implementation, interactive, math, probabilities	3500	x172
2127G1	Inter Active (Easy Version) binary search, constructive algorithms, interactive, probabilities	3400	x195
2111G	Divisible Subarrays binary search, bitmasks, brute force, data structures, interactive	2900	x439
2109C3	Hacking Numbers (Hard Version) constructive algorithms, interactive, math, number theory	2600	x3488
2109C2	Hacking Numbers (Medium Version) constructive algorithms, interactive, math, number theory	1700	x9097
2109C1	Hacking Numbers (Easy Version) bitmasks, constructive algorithms, interactive, math, number theory	1500	x12016
2108D	Needle in a Numstack binary search, brute force, implementation, interactive	2200	x2502
2106G2	Baudelaire (hard version) binary search, dfs and similar, divide and conquer, implementation, interactive, trees	2500	x673
2106G1	Baudelaire (easy version) binary search, constructive algorithms, divide and conquer, greedy, interactive, trees	2200	x1714
2096G	Wonderful Guessing Game bitmasks, constructive algorithms, interactive	3200	x470
2095B	Plinko *special problem, games, interactive		x6092
2087D	Uppercase or Lowercase? special problem, special problem, interactive		x268
2086F	Online Palindrome brute force, constructive algorithms, interactive	3000	x154
2077B	Finding OR Sum bitmasks, constructive algorithms, implementation, interactive, math	1900	x3848
2074E	Empty Triangle geometry, interactive, probabilities	1600	x6983
2073H	Secret Lilies and Roses interactive	2700	x394
2073E	Minus Operator interactive	3300	x87
2066A	Object Identification graphs, greedy, implementation, interactive	1400	x7494
2061G	Kevin and Teams constructive algorithms, graphs, interactive	2900	x569
2052H	Hunting Hoglins in Hogwarts interactive	3500	x84
2049E	Broken Queries binary search, bitmasks, brute force, constructive algorithms, implementation, interactive	2400	x1668
2038G	Guess One Character constructive algorithms, implementation, interactive	1900	x3136
2037E	Kachina's Favorite Binary String dp, greedy, interactive, two pointers	1600	x7720
2036G	Library of Magic binary search, constructive algorithms, divide and conquer, interactive, math, number theory	2200	x1899
2032D	Genokraken constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers	1800	x6420
2031F	Penchick and Even Medians binary search, constructive algorithms, interactive, probabilities	2800	x494
2022D2	Asesino (Hard Version) constructive algorithms, dp, interactive	2700	x876
2022D1	Asesino (Easy Version) binary search, brute force, constructive algorithms, implementation, interactive	1900	x4199
2013C	Password Cracking constructive algorithms, interactive, strings	1400	x15028
2001C	Guess The Tree binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees	1500	x13242
1999G2	Ruler (hard version) binary search, interactive, ternary search	1700	x11865
1999G1	Ruler (easy version) binary search, interactive	1500	x15347
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings	3500	x784
1991I	Grid Game constructive algorithms, games, graph matchings, greedy, interactive	3500	x173
1991E	Coloring Game constructive algorithms, dfs and similar, games, graphs, greedy, interactive	1900	x5320
1990E2	Catch the Mole(Hard Version) binary search, data structures, dfs and similar, divide and conquer, interactive, trees	2600	x1234
1990E1	Catch the Mole(Easy Version) binary search, data structures, dfs and similar, interactive, trees	2500	x1256
1987H	Fumo Temple interactive	3500	x171
1979F	Kostyanych's Theorem brute force, constructive algorithms, graphs, interactive	2900	x456
1977E	Tensor constructive algorithms, graphs, interactive	2600	x967
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x2360

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