Problemset - Codeforces

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Codeforces Round (Div. 2)
5 days

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Problems

#	Name
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x316
1553H	XOR and Distance bitmasks, divide and conquer, trees	2900	x853
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x1215
1553F	Pairwise Modulo data structures, math	2300	x2524
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3776
1553D	Backspace dp, greedy, strings, two pointers	1500	x15115
1553C	Penalty bitmasks, brute force, dp, greedy	1200	x19838
1553B	Reverse String brute force, dp, hashing, implementation, strings	1300	x15507
1553A	Digits Sum math, number theory	800	x34326
1552I	Organizing a Music Festival dfs and similar, math	3400	x148
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x465
1552G	A Serious Referee bitmasks, brute force, dfs and similar, sortings	3000	x671
1552F	Telepanting binary search, data structures, dp, sortings	2200	x3342
1552E	Colors and Intervals constructive algorithms, data structures, greedy, sortings	2300	x2129
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x7906
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x6294
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x16961
1552A	Subsequence Permutation sortings, strings	800	x25363
1551F	Equidistant Vertices brute force, combinatorics, dfs and similar, dp, trees	2200	x2184
1551E	Fixed Points binary search, brute force, dp	2000	x4563
1551D2	Domino (hard version) constructive algorithms, implementation, math	2100	x2992
1551D1	Domino (easy version) constructive algorithms, math	1700	x7579
1551C	Interesting Story greedy, sortings, strings	1500	x14574
1551B2	Wonderful Coloring - 2 binary search, constructive algorithms, data structures, greedy	1400	x16694
1551B1	Wonderful Coloring - 1 greedy, strings	800	x31361
1551A	Polycarp and Coins greedy, math	800	x58545
1550F	Jumping Around binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths	2700	x902
1550E	Stringforces binary search, bitmasks, brute force, dp, strings, two pointers	2500	x1842
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x2061
1550C	Manhattan Subarrays brute force, geometry, greedy, implementation	1700	x10862
1550B	Maximum Cost Deletion greedy, math	1000	x28600
1550A	Find The Array greedy, math	800	x29487
1549B	Gregor and the Pawn Game dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation	800	x26927
1549A	Gregor and Cryptography math, number theory	800	x35621
1548E	Gregor and the Two Painters data structures, divide and conquer, graphs, greedy, math	3400	x602
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x283
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1625
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x2049
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x11391
1548A	Web of Lies brute force, graphs, greedy	1400	x17752
1547G	How Many Paths? dfs and similar, dp, graphs, trees	2100	x3558
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x7001
1547E	Air Conditioners data structures, dp, implementation, shortest paths, sortings, two pointers	1500	x16418
1547D	Co-growing Sequence bitmasks, constructive algorithms, greedy	1300	x18645
1547C	Pair Programming greedy, two pointers	1100	x24456
1547B	Alphabetical Strings greedy, implementation, strings	800	x27932
1547A	Shortest Path with Obstacle implementation, math	800	x32335
1546B	AquaMoon and Stolen String interactive, math	1200	x13962
1546A	AquaMoon and Two Arrays brute force, greedy	800	x18594
1545F	AquaMoon and Potatoes brute force, data structures, dp	3500	x130
1545E2	AquaMoon and Time Stop (hard version) data structures, dp	3500	x101
1545E1	AquaMoon and Time Stop (easy version) data structures, dp	3500	x100
1545D	AquaMoon and Wrong Coordinate constructive algorithms, interactive, math	3000	x609
1545C	AquaMoon and Permutations 2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs	2800	x768
1545B	AquaMoon and Chess combinatorics, math	1900	x6784
1545A	AquaMoon and Strange Sort sortings	1500	x14906
1543E	The Final Pursuit bitmasks, constructive algorithms, divide and conquer, graphs, greedy, math	2700	x452
1543D2	RPD and Rap Sheet (Hard Version) brute force, constructive algorithms, interactive, math	2200	x2172
1543D1	RPD and Rap Sheet (Easy Version) bitmasks, constructive algorithms, interactive, math	1700	x8021
1543C	Need for Pink Slips bitmasks, brute force, dfs and similar, implementation, math, probabilities	1900	x5632
1543B	Customising the Track combinatorics, greedy, math	900	x24520
1543A	Exciting Bets greedy, math, number theory	900	x41419
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x1018
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1440
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2923
1542C	Strange Function math, number theory	1600	x16236
1542B	Plus and Multiply constructive algorithms, math, number theory	1500	x26624
1542A	Odd Set math	800	x51803
1541B	Pleasant Pairs brute force, implementation, math, number theory	1200	x38784
1541A	Pretty Permutations constructive algorithms, greedy, implementation	800	x30748
1540E	Tasty Dishes math, matrices	3500	x134
1540D	Inverse Inversions binary search, brute force, data structures	3200	x386
1540C2	Converging Array (Hard Version) dp, math	2900	x559
1540C1	Converging Array (Easy Version) dp, math	2700	x750
1540B	Tree Array brute force, combinatorics, dp, graphs, math, probabilities, trees	2300	x2999
1540A	Great Graphs constructive algorithms, graphs, greedy, shortest paths, sortings	1400	x15012
1539F	Strange Array data structures, greedy, sortings	2600	x985
1539E	Game with Cards binary search, constructive algorithms, data structures, dp, greedy, implementation	2500	x1055
1539D	PriceFixed binary search, greedy, implementation, sortings, two pointers	1600	x12764
1539C	Stable Groups greedy, sortings	1200	x31740
1539B	Love Song dp, implementation, strings	800	x26798
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x21551
1538G	Gift Set binary search, greedy, math, ternary search	2100	x5221
1538F	Interesting Function binary search, dp, math, number theory	1500	x22282
1538E	Funny Substrings data structures, hashing, implementation, matrices, strings	2100	x3224
1538D	Another Problem About Dividing Numbers constructive algorithms, math, number theory	1700	x15307
1538C	Number of Pairs binary search, data structures, math, two pointers	1300	x34570
1538B	Friends and Candies greedy, math	800	x33578
1538A	Stone Game brute force, dp, greedy	800	x40475
1537F	Figure Fixing constructive algorithms, dfs and similar, dsu, graphs, greedy, math	2200	x2819
1537E2	Erase and Extend (Hard Version) binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers	2200	x6187
1537E1	Erase and Extend (Easy Version) binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers	1600	x16426
1537D	Deleting Divisors games, math, number theory	1700	x13657
1537C	Challenging Cliffs constructive algorithms, greedy, implementation, math	1200	x30362
1537B	Bad Boy constructive algorithms, greedy, math	900	x42755
1537A	Arithmetic Array greedy, math	800	x41063
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x1104
1536E	Omkar and Forest combinatorics, graphs, math, shortest paths	2300	x2739
1536D	Omkar and Medians data structures, greedy, implementation	2000	x5077
1536C	Diluc and Kaeya data structures, dp, hashing, number theory	1500	x16168

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