Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1561D1	Up the Strip (simplified version) brute force, data structures, dp, math, number theory	1700	x5613
1561C	Deep Down Below binary search, greedy, sortings	1300	x14627
1561A	Simply Strange Sort brute force, implementation, sortings	800	x16567
1560F2	Nearest Beautiful Number (hard version) bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy	2100	x4388
1560F1	Nearest Beautiful Number (easy version) binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy	1900	x6141
1560E	Polycarp and String Transformation binary search, implementation, sortings, strings	1800	x7964
1560D	Make a Power of Two greedy, math, strings	1300	x18194
1560C	Infinity Table implementation, math	800	x26579
1560B	Who's Opposite? math	800	x35633
1560A	Dislike of Threes implementation	800	x59823
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2308
1559D2	Mocha and Diana (Hard Version) brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers	2500	x2655
1559D1	Mocha and Diana (Easy Version) brute force, constructive algorithms, dsu, graphs, greedy, trees	1400	x13824
1559C	Mocha and Hiking constructive algorithms, graphs	1200	x20463
1559B	Mocha and Red and Blue dp, greedy	900	x22500
1559A	Mocha and Math bitmasks, constructive algorithms, math	900	x31349
1558F	Strange Sort data structures, sortings	3300	x391
1558E	Down Below binary search, dfs and similar, graphs, greedy, meet-in-the-middle, shortest paths	3000	x472
1558D	Top-Notch Insertions combinatorics, data structures	2600	x972
1558C	Bottom-Tier Reversals constructive algorithms, greedy	2000	x3280
1558B	Up the Strip brute force, dp, math, number theory, two pointers	1900	x4796
1558A	Charmed by the Game brute force, math	1300	x11094
1557E	Assiut Chess brute force, constructive algorithms, interactive	2800	x715
1557D	Ezzat and Grid data structures, dp, greedy	2200	x2553
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x8607
1557B	Moamen and k-subarrays greedy, sortings	1100	x23440
1557A	Ezzat and Two Subsequences brute force, math, sortings	800	x27915
1556H	DIY Tree graphs, greedy, math, probabilities	3300	x364
1556G	Gates to Another World bitmasks, data structures, dsu, two pointers	3300	x323
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1244
1556E	Equilibrium data structures, dp, greedy	2200	x2710
1556D	Take a Guess bitmasks, constructive algorithms, interactive, math	1800	x6925
1556C	Compressed Bracket Sequence brute force, implementation	1800	x5789
1556B	Take Your Places! implementation	1300	x12694
1556A	A Variety of Operations math	800	x18073
1555F	Good Graph data structures, dsu, graphs, trees	2700	x852
1555E	Boring Segments data structures, sortings, trees, two pointers	2100	x4037
1555D	Say No to Palindromes brute force, constructive algorithms, dp, strings	1600	x12381
1555C	Coin Rows brute force, constructive algorithms, dp, implementation	1300	x21728
1555B	Two Tables brute force	1300	x16064
1555A	PizzaForces brute force, math	900	x28069
1554E	You dfs and similar, dp, math, number theory	2600	x1227
1554D	Diane constructive algorithms, greedy, strings	1800	x9460
1554C	Mikasa binary search, bitmasks, greedy, implementation	1800	x8873
1554B	Cobb bitmasks, brute force, greedy, math	1700	x12779
1554A	Cherry greedy	800	x29287
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x203
1553H	XOR and Distance bitmasks, divide and conquer, trees	2900	x702
1553G	Common Divisor Graph brute force, constructive algorithms, dsu, graphs, hashing, math, number theory	2700	x1024
1553F	Pairwise Modulo data structures, math	2300	x2226
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3330
1553D	Backspace dp, greedy, strings, two pointers	1500	x13736
1553C	Penalty bitmasks, brute force, dp, greedy	1200	x17859
1553B	Reverse String brute force, dp, hashing, implementation, strings	1300	x14147
1553A	Digits Sum math, number theory	800	x31003
1552I	Organizing a Music Festival dfs and similar, math	3400	x128
1552H	Guess the Perimeter binary search, interactive, number theory	3300	x389
1552G	A Serious Referee bitmasks, brute force, dfs and similar, sortings	3000	x528
1552F	Telepanting binary search, data structures, dp, sortings	2200	x2924
1552E	Colors and Intervals constructive algorithms, data structures, greedy, sortings	2300	x1872
1552D	Array Differentiation bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math	1800	x7014
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5909
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x15423
1552A	Subsequence Permutation sortings, strings	800	x23857
1551F	Equidistant Vertices brute force, combinatorics, dfs and similar, dp, trees	2200	x1835
1551E	Fixed Points binary search, brute force, dp	2000	x3925
1551D2	Domino (hard version) constructive algorithms, implementation, math	2100	x2758
1551D1	Domino (easy version) constructive algorithms, math	1700	x7073
1551C	Interesting Story greedy, sortings, strings	1500	x13304
1551B2	Wonderful Coloring - 2 binary search, constructive algorithms, data structures, greedy	1400	x15508
1551B1	Wonderful Coloring - 1 greedy, strings	800	x29214
1551A	Polycarp and Coins greedy, math	800	x50854
1550F	Jumping Around binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths	2700	x670
1550E	Stringforces binary search, bitmasks, brute force, dp, strings, two pointers	2500	x1527
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x1843
1550C	Manhattan Subarrays brute force, geometry, greedy, implementation	1700	x10189
1550B	Maximum Cost Deletion greedy, math	1000	x26425
1550A	Find The Array greedy, math	800	x28113
1549B	Gregor and the Pawn Game dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation	800	x24363
1549A	Gregor and Cryptography math, number theory	800	x32458
1548E	Gregor and the Two Painters data structures, divide and conquer, graphs, greedy, math	3400	x452
1548D2	Gregor and the Odd Cows (Hard) brute force, geometry, math, number theory	3300	x255
1548D1	Gregor and the Odd Cows (Easy) bitmasks, geometry, math, number theory	2300	x1463
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x1834
1548B	Integers Have Friends binary search, data structures, divide and conquer, math, number theory, two pointers	1800	x9826
1548A	Web of Lies brute force, graphs, greedy	1400	x16427
1547G	How Many Paths? dfs and similar, dp, graphs, trees	2100	x3000
1547F	Array Stabilization (GCD version) binary search, brute force, data structures, divide and conquer, number theory, two pointers	1900	x5825
1547E	Air Conditioners data structures, dp, implementation, shortest paths, sortings, two pointers	1500	x14449
1547D	Co-growing Sequence bitmasks, constructive algorithms, greedy	1300	x16694
1547C	Pair Programming greedy, two pointers	1100	x22643
1547B	Alphabetical Strings greedy, implementation, strings	800	x26396
1547A	Shortest Path with Obstacle implementation, math	800	x30445
1546B	AquaMoon and Stolen String interactive, math	1200	x13129
1546A	AquaMoon and Two Arrays brute force, greedy	800	x18206
1545F	AquaMoon and Potatoes brute force, data structures, dp	3500	x108
1545E2	AquaMoon and Time Stop (hard version) data structures, dp	3500	x86
1545E1	AquaMoon and Time Stop (easy version) data structures, dp	3500	x81
1545D	AquaMoon and Wrong Coordinate constructive algorithms, interactive, math	3000	x494
1545C	AquaMoon and Permutations 2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs	2800	x616