Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1545B	AquaMoon and Chess combinatorics, math	1900	x5938
1545A	AquaMoon and Strange Sort sortings	1500	x13898
1543E	The Final Pursuit bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math	2700	x413
1543D2	RPD and Rap Sheet (Hard Version) brute force, constructive algorithms, interactive, math	2200	x2015
1543D1	RPD and Rap Sheet (Easy Version) bitmasks, constructive algorithms, interactive, math	1700	x7603
1543C	Need for Pink Slips bitmasks, brute force, dfs and similar, implementation, math, probabilities	1900	x5291
1543B	Customising the Track combinatorics, greedy, math	900	x23084
1543A	Exciting Bets greedy, math, number theory	900	x28261
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x855
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1245
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2633
1542C	Strange Function math, number theory	1600	x14215
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x23118
1542A	Odd Set math	800	x44686
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x28530
1541A	Pretty Permutations constructive algorithms, greedy, implementation	800	x29412
1540E	Tasty Dishes math, matrices	3500	x105
1540D	Inverse Inversions binary search, brute force, data structures	3200	x277
1540C2	Converging Array (Hard Version) dp, math	2900	x456
1540C1	Converging Array (Easy Version) dp, math	2700	x624
1540B	Tree Array brute force, combinatorics, dp, graphs, math, probabilities, trees	2300	x2610
1540A	Great Graphs constructive algorithms, graphs, greedy, shortest paths, sortings	1400	x13941
1539F	Strange Array data structures, greedy, sortings	2600	x864
1539E	Game with Cards binary search, constructive algorithms, data structures, dp, greedy, implementation	2500	x949
1539D	PriceFixed binary search, greedy, implementation, sortings, two pointers	1600	x11640
1539C	Stable Groups greedy, sortings	1200	x22913
1539B	Love Song dp, implementation, strings	800	x24441
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x20064
1538G	Gift Set binary search, greedy, math, ternary search	2100	x4547
1538F	Interesting Function binary search, dp, math, number theory	1500	x19257
1538E	Funny Substrings data structures, hashing, implementation, matrices, strings	2100	x2897
1538D	Another Problem About Dividing Numbers constructive algorithms, math, number theory	1700	x13610
1538C	Number of Pairs binary search, data structures, math, two pointers	1300	x28519
1538B	Friends and Candies greedy, math	800	x31664
1538A	Stone Game brute force, dp, greedy	800	x36823
1537F	Figure Fixing constructive algorithms, dfs and similar, dsu, graphs, greedy, math	2200	x2468
1537E2	Erase and Extend (Hard Version) binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers	2200	x5211
1537E1	Erase and Extend (Easy Version) binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers	1600	x12948
1537D	Deleting Divisors games, math, number theory	1700	x12387
1537C	Challenging Cliffs constructive algorithms, greedy, implementation, math	1200	x27627
1537B	Bad Boy constructive algorithms, greedy, math	900	x29939
1537A	Arithmetic Array greedy, math	800	x37204
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x956
1536E	Omkar and Forest combinatorics, graphs, math, shortest paths	2300	x2416
1536D	Omkar and Medians data structures, greedy, implementation	2000	x4683
1536C	Diluc and Kaeya data structures, dp, hashing, number theory	1500	x14133
1536B	Prinzessin der Verurteilung brute force, constructive algorithms, strings	1200	x18790
1536A	Omkar and Bad Story brute force, constructive algorithms	800	x20195
1535F	String Distance binary search, brute force, data structures, hashing, implementation, strings	3000	x451
1535E	Gold Transfer binary search, data structures, dp, greedy, interactive, trees	2200	x2746
1535D	Playoff Tournament data structures, dfs and similar, dp, implementation, trees	1800	x7733
1535C	Unstable String binary search, dp, greedy, implementation, strings, two pointers	1400	x16491
1535B	Array Reodering brute force, greedy, math, number theory, sortings	900	x30512
1535A	Fair Playoff brute force, implementation	800	x49431
1534H	Lost Nodes constructive algorithms, dp, graphs, interactive, sortings, trees	3500	x149
1534G	A New Beginning data structures, dp, geometry, sortings	3300	x567
1534F2	Falling Sand (Hard Version) dfs and similar, dp, graphs, greedy	3000	x538
1534F1	Falling Sand (Easy Version) dfs and similar, graphs, greedy	2500	x1227
1534E	Lost Array graphs, greedy, interactive, shortest paths	2300	x1925
1534D	Lost Tree constructive algorithms, interactive, trees	1800	x6034
1534C	Little Alawn's Puzzle combinatorics, dp, dsu, graphs, math	1300	x12807
1534B	Histogram Ugliness greedy, implementation, math	1100	x12504
1534A	Colour the Flag brute force, implementation	800	x12734
1530H	Turing's Award data structures, dp	3400	x156
1530G	What a Reversal constructive algorithms	3300	x144
1530F	Bingo bitmasks, combinatorics, dp, math, probabilities	2600	x795
1530E	Minimax constructive algorithms, greedy, strings	2100	x2970
1530D	Secret Santa constructive algorithms, flows, graphs, greedy, math	1600	x9208
1530C	Pursuit binary search, brute force, greedy, sortings	1200	x14651
1530B	Putting Plates constructive algorithms, implementation	800	x15781
1530A	Binary Decimal greedy, math	800	x21064
1529B	Sifid and Strange Subsequences greedy, math, sortings	1100	x20568
1529A	Eshag Loves Big Arrays constructive algorithms, greedy, math	800	x29757
1528F	AmShZ Farm combinatorics, fft, math	3300	x288
1528E	Mashtali and Hagh Trees combinatorics, dp, trees	2900	x522
1528D	It's a bird! No, it's a plane! No, it's AaParsa! constructive algorithms, graphs, shortest paths	2500	x1432
1528C	Trees of Tranquillity data structures, dfs and similar, greedy, trees	2300	x2641
1528B	Kavi on Pairing Duty combinatorics, dp, math	1700	x8698
1528A	Parsa's Humongous Tree dfs and similar, divide and conquer, dp, greedy, trees	1600	x14719
1527E	Partition Game binary search, data structures, divide and conquer, dp	2500	x2321
1527D	MEX Tree combinatorics, dfs and similar, implementation, math, trees	2400	x1905
1527C	Sequence Pair Weight hashing, implementation, math	1600	x13550
1527B2	Palindrome Game (hard version) constructive algorithms, games	1900	x7921
1527B1	Palindrome Game (easy version) constructive algorithms, games	1200	x26111
1527A	And Then There Were K bitmasks	800	x35617
1526F	Median Queries constructive algorithms, interactive, probabilities	3000	x285
1526E	Oolimry and Suffix Array combinatorics, constructive algorithms, math	2400	x1055
1526D	Kill Anton brute force, constructive algorithms, data structures, math, strings	2200	x2473
1526C2	Potions (Hard Version) data structures, greedy	1600	x22661
1526C1	Potions (Easy Version) brute force, data structures, dp, greedy	1500	x22441
1526B	I Hate 1111 dp, math, number theory	1400	x30582
1526A	Mean Inequality constructive algorithms, sortings	800	x24181
1525F	Goblins And Gnomes brute force, dp, flows, graph matchings	2800	x329
1525E	Assimilation IV combinatorics, dp, math, probabilities, two pointers	2100	x2054
1525D	Armchairs dp, flows, graph matchings, greedy	1800	x9772
1525C	Robot Collisions data structures, greedy, implementation, sortings	2000	x4464
1525B	Permutation Sort constructive algorithms, greedy	900	x24750
1525A	Potion-making math, number theory	800	x25375
1523H	Hopping Around the Array data structures, dp	3500	x246
1523G	Try Booking data structures, divide and conquer	3200	x465