Problemset - Codeforces

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Codeforces Round 973 (Div. 2)
13:35:04
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combinatorics

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Problems

#	Name
1673E	Power or XOR? bitmasks, combinatorics, math, number theory	2500	x702
1673D	Lost Arithmetic Progression combinatorics, math, number theory	1900	x3295
1671F	Permutation Counting brute force, combinatorics, dp, fft, math	2700	x332
1671E	Preorder combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees	2100	x2736
1670F	Jee, You See? bitmasks, combinatorics, dp	2400	x968
1667E	Centroid Probabilities combinatorics, dp, fft, math	3000	x646
1666F	Fancy Stack combinatorics, dp, implementation	2200	x1154
1663D	Is it rated - 3 *special problem, combinatorics, dp, math		x1405
1662N	Drone Photo combinatorics, math, sortings		x747
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x18558
1657E	Star MST combinatorics, dp, graph matchings, math	2200	x2070
1654H	Three Minimums combinatorics, constructive algorithms, divide and conquer, dp, fft, math	3500	x76
1651E	Sum of Matchings brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math	2600	x517
1648C	Tyler and Strings combinatorics, data structures, implementation	1900	x2946
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x12694
1644F	Basis combinatorics, fft, math, number theory	2900	x321
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x3085
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x207
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1148
1630E	Expected Components combinatorics, math, number theory, probabilities	2900	x436
1628D2	Game on Sum (Hard Version) combinatorics, dp, games, math	2400	x2054
1628D1	Game on Sum (Easy Version) combinatorics, dp, games, math	2100	x3133
1626F	A Random Code Problem combinatorics, dp, math, number theory, probabilities	2800	x728
1622D	Shuffle combinatorics, math, two pointers	2000	x4028
1620G	Subsequences Galore bitmasks, combinatorics, dp	2400	x889
1616H	Keep XOR Low bitmasks, combinatorics, data structures, divide and conquer, dp, math	3000	x911
1615F	LEGOndary Grandmaster combinatorics, dp, math	2800	x870
1614C	Divan and bitwise operations bitmasks, combinatorics, constructive algorithms, dp, math	1500	x10218
1613F	Tree Coloring combinatorics, divide and conquer, fft	2600	x684
1612G	Max Sum Array combinatorics, constructive algorithms, greedy, sortings	2500	x837
1610D	Not Quite Lee combinatorics, dp, math, number theory	2000	x2695
1608F	MEX counting combinatorics, dp, implementation	3200	x584
1608D	Dominoes combinatorics, fft, graphs, math, number theory	2400	x1383
1606E	Arena combinatorics, dp, math	2100	x3507
1605F	PalindORme combinatorics, dp	2900	x302
1603F	October 18, 2017 combinatorics, dp, implementation, math	2700	x279
1603E	A Perfect Problem combinatorics, dp, math	3200	x420
1599C	Bubble Strike combinatorics, math, probabilities, ternary search	2000	x1643
1598E	Staircases brute force, combinatorics, data structures, dfs and similar, dp, implementation, math	2100	x2295
1598D	Training Session combinatorics, data structures, geometry, implementation, math	1700	x8629
1594E1	Rubik's Cube Coloring (easy version) combinatorics, math	1300	x11070
1586I	Omkar and Mosaic combinatorics, constructive algorithms, math	3500	x192
1585F	Non-equal Neighbours combinatorics, dp, math	2400	x1222
1584D	Guess the Permutation binary search, combinatorics, interactive, math	2000	x3654
1582B	Luntik and Subsequences combinatorics, math	900	x20303
1581A	CQXYM Count Permutations combinatorics, math, number theory	800	x13401
1580F	Problems for Codeforces combinatorics, fft, math	3300	x133
1580B	Mathematics Curriculum brute force, combinatorics, dp, trees	2600	x1034
1574F	Occurrences combinatorics, dfs and similar, dp, dsu, fft, graphs	2700	x620
1574E	Coloring combinatorics, constructive algorithms, implementation, math	2500	x902
1574B	Combinatorics Homework combinatorics, greedy, math	1100	x17273
1569C	Jury Meeting combinatorics, math	1500	x11984
1567C	Carrying Conundrum bitmasks, combinatorics, dp, math	1600	x12147
1559E	Mocha and Stars combinatorics, dp, fft, math, number theory	2200	x2296
1558D	Top-Notch Insertions combinatorics, data structures	2600	x964
1557C	Moamen and XOR bitmasks, combinatorics, dp, math, matrices	1700	x8576
1556F	Sports Betting bitmasks, combinatorics, dp, graphs, math, probabilities	2500	x1224
1553I	Stairs combinatorics, divide and conquer, dp, fft, math	3400	x203
1553E	Permutation Shift brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math	2100	x3317
1552C	Maximize the Intersections combinatorics, constructive algorithms, geometry, greedy, sortings	1800	x5898
1552B	Running for Gold combinatorics, graphs, greedy, sortings	1500	x15380
1551F	Equidistant Vertices brute force, combinatorics, dfs and similar, dp, trees	2200	x1831
1550D	Excellent Arrays binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers	2300	x1833
1548C	The Three Little Pigs combinatorics, dp, fft, math	2500	x1822
1545C	AquaMoon and Permutations 2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs	2800	x604
1545B	AquaMoon and Chess combinatorics, math	1900	x5908
1543B	Customising the Track combinatorics, greedy, math	900	x23051
1542E2	Abnormal Permutation Pairs (hard version) combinatorics, dp, fft, math	2700	x846
1542E1	Abnormal Permutation Pairs (easy version) combinatorics, dp, fft, math	2400	x1231
1542D	Priority Queue combinatorics, dp, implementation, math, ternary search	2200	x2607
1540B	Tree Array brute force, combinatorics, dp, graphs, math, probabilities, trees	2300	x2586
1539A	Contest Start combinatorics, geometry, greedy, math	1000	x20025
1536F	Omkar and Akmar chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures	2600	x948
1536E	Omkar and Forest combinatorics, graphs, math, shortest paths	2300	x2396
1534C	Little Alawn's Puzzle combinatorics, dp, dsu, graphs, math	1300	x12786
1530F	Bingo bitmasks, combinatorics, dp, math, probabilities	2600	x787
1528F	AmShZ Farm combinatorics, fft, math	3300	x287
1528E	Mashtali and Hagh Trees combinatorics, dp, trees	2900	x522
1528B	Kavi on Pairing Duty combinatorics, dp, math	1700	x8679
1527D	MEX Tree combinatorics, dfs and similar, implementation, math, trees	2400	x1901
1526E	Oolimry and Suffix Array combinatorics, constructive algorithms, math	2400	x1048
1525E	Assimilation IV combinatorics, dp, math, probabilities, two pointers	2100	x2046
1523E	Crypto Lights combinatorics, dp, math, probabilities	2600	x1644
1517F	Reunion combinatorics, dp, trees	3200	x459
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x862
1515E	Phoenix and Computers combinatorics, dp, math	2200	x3540
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x24751
1513E	Cost Equilibrium combinatorics, constructive algorithms, math, sortings	2300	x1494
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x14607
1511E	Colorings and Dominoes combinatorics, dp, greedy, math	2100	x2574
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x3976
1503E	2-Coloring combinatorics, dp, math	3100	x692
1499F	Diameter Cuts combinatorics, dfs and similar, dp, trees	2400	x1320
1499E	Chaotic Merge combinatorics, dp, math, strings	2400	x1503
1499A	Domino on Windowsill combinatorics, constructive algorithms, math	800	x21226
1495D	BFS Trees combinatorics, dfs and similar, graphs, math, shortest paths, trees	2600	x1315
1488H	Build From Suffixes *special problem, combinatorics, data structures	2800	x58
1487G	String Counting combinatorics, dp, fft, math	2700	x595
1486F	Pairs of Paths combinatorics, data structures, dfs and similar, dp, trees	2600	x653
1485F	Copy or Prefix Sum combinatorics, data structures, dp, sortings	2400	x1935