Problemset - Codeforces

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Codeforces Round (Div. 2)
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combinatorics

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Problems

#	Name
2135E2	Beyond the Palindrome (Hard Version) combinatorics, dp, math, number theory	3500	x324
2135E1	Beyond the Palindrome (Easy Version) combinatorics, dp, math	3300	x1403
2135C	By the Assignment binary search, bitmasks, combinatorics, dfs and similar, dsu, graphs, math	2000	x6596
2134F	Permutation Oddness combinatorics, dp, math	2900	x720
2129D	Permutation Blackhole brute force, combinatorics, dp, implementation, math	2600	x3792
2128D	Sum of LDS brute force, combinatorics, dp, greedy, math	1600	x13192
2127F	Hamed and AghaBalaSar brute force, combinatorics, dp, math, probabilities	2800	x3018
2127D	Root was Built by Love, Broken by Destiny combinatorics, dfs and similar, graphs, trees	1800	x8509
2125E	Sets of Complementary Sums brute force, combinatorics, dp, math, two pointers	2500	x1477
2125C	Count Good Numbers bitmasks, combinatorics, math, number theory	1100	x23732
2124F2	Appending Permutations (Hard Version) combinatorics, dp	2800	x1261
2124F1	Appending Permutations (Easy Version) combinatorics, dp	2300	x3562
2122G	Tree Parking combinatorics, fft, math, trees	3300	x2443
2122E	Greedy Grid Counting combinatorics, dp, greedy, math	2600	x3085
2120D	Matrix game combinatorics, math	1800	x6068
2119D	Token Removing combinatorics, dp, math	2100	x3631
2117F	Wildflower combinatorics, dfs and similar, trees	1800	x6245
2115C	Gellyfish and Eternal Violet combinatorics, dp, greedy, math, probabilities	2700	x2126
2112E	Tree Colorings combinatorics, dfs and similar, dp, graphs, math, number theory, trees	2200	x3527
2109E	Binary String Wowee combinatorics, dp, strings	2400	x1916
2108A	Permutation Warm-Up combinatorics, greedy, math	800	x22525
2101F	Shoo Shatters the Sunshine combinatorics, dp, trees	3300	x308
2097B	Baggage Claim combinatorics, dfs and similar, dp, dsu, graphs, implementation, math, trees	2300	x2025
2096H	Wonderful XOR Problem bitmasks, combinatorics, dp, fft, math	3200	x239
2096D	Wonderful Lightbulbs combinatorics, constructive algorithms, math	2000	x5781
2092E	She knows... combinatorics, constructive algorithms, graphs, math	2100	x3969
2086D	Even String brute force, combinatorics, dp, math, strings	1700	x8777
2084E	Blossom binary search, combinatorics, dp, implementation, math, two pointers	2400	x1851
2081E	Quantifier combinatorics, dp, implementation	3300	x92
2077E	Another Folding Strip combinatorics, constructive algorithms, data structures, divide and conquer, dp, greedy, math	2700	x648
2077C	Binary Subsequence Value Sum combinatorics, data structures, dp, fft, math, matrices	2300	x2476
2075E	XOR Matrix bitmasks, combinatorics, dp, implementation, math	2500	x1228
2075C	Two Colors binary search, combinatorics, math	1500	x15038
2072G	I've Been Flipping Numbers for 300 Years and Calculated the Sum binary search, brute force, combinatorics, divide and conquer, math, number theory	2200	x2227
2072F	Goodbye, Banker Life 2-sat, bitmasks, combinatorics, constructive algorithms, fft, math, number theory	1700	x8847
2072B	Having Been a Treasurer in the Past, I Help Goblins Deceive combinatorics, constructive algorithms, strings	900	x31877
2071E	LeaFall combinatorics, dp, probabilities, trees	2600	x857
2069C	Beautiful Sequence combinatorics, dp, greedy, two pointers	1500	x15587
2068J	The Ultimate Wine Tasting Event combinatorics, greedy	2000	x1704
2066D2	Club of Young Aircraft Builders (hard version) combinatorics, dp, math	2900	x691
2066D1	Club of Young Aircraft Builders (easy version) combinatorics, dp, math	2400	x1560
2066C	Bitwise Slides bitmasks, combinatorics, dp, math	2300	x2612
2065H	Bro Thinks He's Him combinatorics, data structures, divide and conquer, dp, math, matrices	2200	x2083
2065G	Skibidus and Capping combinatorics, math, number theory	1700	x6684
2064E	Mycraft Sand Sort combinatorics, data structures, dsu, greedy, math, sortings	2400	x1568
2063F2	Counting Is Not Fun (Hard Version) combinatorics, data structures, dfs and similar, dsu, graphs, implementation, trees	2700	x989
2063F1	Counting Is Not Fun (Easy Version) combinatorics, data structures, dfs and similar, dp, dsu, graphs, hashing, implementation, math, trees	2400	x1605
2062H	Galaxy Generator bitmasks, combinatorics, dp	3500	x211
2061C	Kevin and Puzzle 2-sat, combinatorics, dp	1600	x10487
2060F	Multiplicative Arrays combinatorics, dp, number theory	2200	x2715
2056F2	Xor of Median (Hard Version) bitmasks, brute force, combinatorics, dp, math	3000	x377
2056F1	Xor of Median (Easy Version) bitmasks, brute force, combinatorics, dp, math	2700	x469
2056E	Nested Segments combinatorics, dfs and similar, dp, dsu, math	2500	x1080
2056D	Unique Median binary search, brute force, combinatorics, data structures, divide and conquer, dp	2200	x3781
2048G	Kevin and Matrices brute force, combinatorics, dp, math	2800	x807
2047B	Replace Character brute force, combinatorics, greedy, strings	900	x19946
2045E	Narrower Passageway combinatorics, data structures	2700	x405
2043F	Nim bitmasks, brute force, combinatorics, dp, games, greedy, implementation, shortest paths	2700	x935
2041H	Sheet Music combinatorics, dp, math	2300	x1089
2040F	Number of Cubes combinatorics, dp, math, number theory	2700	x477
2040E	Control of Randomness combinatorics, dfs and similar, dp, graphs, greedy, math, probabilities, trees	2100	x2869
2040C	Ordered Permutations bitmasks, combinatorics, constructive algorithms, greedy, math, two pointers	1600	x11245
2039F1	Shohag Loves Counting (Easy Version) combinatorics, dp, math, number theory	2800	x544
2039E	Shohag Loves Inversions combinatorics, dp, implementation, math	2200	x2454
2038F	Alternative Platforms combinatorics, data structures, fft, math, sortings	2500	x502
2037G	Natlan Exploring bitmasks, combinatorics, data structures, dp, math, number theory	2000	x3995
2034F2	Khayyam's Royal Decree (Hard Version) combinatorics, dp, math, sortings	2800	x624
2034F1	Khayyam's Royal Decree (Easy Version) combinatorics, dp, math, sortings	2500	x925
2034E	Permutations Harmony combinatorics, constructive algorithms, greedy, hashing, math	2200	x2107
2032F	Peanuts combinatorics, dp, games, math	2700	x510
2030G2	The Destruction of the Universe (Hard Version) combinatorics, math	3100	x279
2030G1	The Destruction of the Universe (Easy Version) combinatorics, greedy, math	2900	x306
2030E	MEXimize the Score combinatorics, data structures, dp, greedy, implementation, math	2200	x2065
2030B	Minimise Oneness combinatorics, constructive algorithms, games, math	800	x24277
2029H	Message Spread bitmasks, brute force, combinatorics, dp	3500	x120
2028E	Alice's Adventures in the Rabbit Hole combinatorics, dfs and similar, dp, games, greedy, math, probabilities, trees	2300	x2047
2025E	Card Game combinatorics, dp, fft, greedy, math	2200	x2456
2025B	Binomial Coefficients, Kind Of combinatorics, dp, math	1100	x20021
2022E2	Billetes MX (Hard Version) binary search, combinatorics, data structures, dsu, graphs	2600	x751
2022E1	Billetes MX (Easy Version) 2-sat, binary search, combinatorics, constructive algorithms, dfs and similar, dsu, graphs	2500	x800
2018F1	Speedbreaker Counting (Easy Version) combinatorics, dp, greedy, math	2900	x359
2008F	Sakurako's Box combinatorics, math, number theory	1400	x16244
2006F	Dora's Paint brute force, combinatorics, constructive algorithms, graphs, implementation	3500	x184
2005A	Simple Palindrome combinatorics, constructive algorithms, greedy, math	900	x27016
2001E2	Deterministic Heap (Hard Version) combinatorics, dp, trees	2900	x314
2001E1	Deterministic Heap (Easy Version) combinatorics, dp, math, trees	2400	x1598
2000E	Photoshoot for Gorillas combinatorics, data structures, greedy, math	1400	x16912
1999F	Expected Median combinatorics, math	1500	x14824
1997F	Chips on a Line brute force, combinatorics, dp, greedy, math	2700	x1355
1996E	Decode combinatorics, data structures, implementation, math	1600	x13070
1996D	Fun binary search, brute force, combinatorics, math, number theory	1500	x20285
1994H	Fortnite combinatorics, constructive algorithms, games, greedy, hashing, interactive, math, number theory, strings	3500	x784
1992G	Ultra-Meow combinatorics, dp, math	2000	x4401
1989E	Distance to Different combinatorics, dp, math	2300	x2636
1988F	Heartbeat combinatorics, dp, fft, math	3000	x602
1986G1	Permutation Problem (Simple Version) binary search, brute force, combinatorics, data structures, math, number theory	2200	x2009
1985G	D-Function combinatorics, math, number theory	1600	x12787
1985E	Secret Box brute force, combinatorics, math	1200	x24124
1984H	Tower Capturing combinatorics, dp, geometry	3300	x311
1984C2	Magnitude (Hard Version) combinatorics, dp, greedy, math	1700	x8956

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