Problemset - Codeforces

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Codeforces Round 978 (Div. 2)
6 days

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Difficulty: —

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Problems

#	Name
1407C	Chocolate Bunny constructive algorithms, interactive, math, two pointers	1600	x12056
1407B	Big Vova brute force, greedy, math, number theory	1300	x17027
1407A	Ahahahahahahahaha constructive algorithms, math	1100	x20440
1406E	Deleting Numbers interactive, math, number theory	2600	x1695
1406D	Three Sequences constructive algorithms, data structures, greedy, math	2200	x3501
1406C	Link Cut Centroids constructive algorithms, dfs and similar, graphs, trees	1700	x10296
1406B	Maximum Product brute force, dp, greedy, implementation, sortings	1200	x22638
1406A	Subset Mex greedy, implementation, math	900	x21490
1405B	Array Cancellation constructive algorithms, implementation	1000	x21557
1405A	Permutation Forgery constructive algorithms	800	x21448
1404E	Bricks flows, graph matchings, graphs	2800	x1236
1404D	Game of Pairs constructive algorithms, dfs and similar, interactive, math, number theory	2800	x1079
1404C	Fixed Point Removal binary search, constructive algorithms, data structures, greedy, two pointers	2300	x2665
1404B	Tree Tag dfs and similar, dp, games, trees	1900	x7405
1404A	Balanced Bitstring implementation, strings	1500	x15435
1403C	Chess Rush *special problem, combinatorics, dp, implementation, math	3200	x51
1403B	Spring cleaning *special problem, data structures, dfs and similar, graphs, trees	2300	x366
1403A	The Potion of Great Power *special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers	2400	x290
1402C	Star Trek *special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees	2600	x203
1402B	Roads *special problem, geometry, sortings	2900	x111
1402A	Fancy Fence *special problem, data structures, dsu, implementation, math, sortings	1800	x1189
1401F	Reverse and Swap binary search, bitmasks, data structures	2400	x1744
1401E	Divide Square data structures, geometry, implementation, sortings	2400	x2440
1401D	Maximum Distributed Tree dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees	1800	x9321
1401C	Mere Array constructive algorithms, math, number theory, sortings	1300	x24297
1401B	Ternary Sequence constructive algorithms, greedy, math	1100	x21076
1401A	Distance and Axis constructive algorithms, math	900	x27486
1400G	Mercenaries bitmasks, brute force, combinatorics, dp, dsu, math, two pointers	2600	x967
1400F	x-prime Substrings brute force, dfs and similar, dp, string suffix structures, strings	2800	x893
1400E	Clear the Multiset data structures, divide and conquer, dp, greedy	2200	x5443
1400D	Zigzags brute force, combinatorics, data structures, math, two pointers	1900	x10276
1400C	Binary String Reconstruction 2-sat, brute force, constructive algorithms, greedy	1500	x17337
1400B	RPG Protagonist brute force, greedy, math	1700	x11193
1400A	String Similarity constructive algorithms, strings	800	x27016
1399F	Yet Another Segments Subset data structures, dp, graphs, sortings	2300	x1611
1399E2	Weights Division (hard version) binary search, dfs and similar, greedy, sortings, trees, two pointers	2200	x2281
1399E1	Weights Division (easy version) data structures, dfs and similar, greedy, trees	2000	x5830
1399D	Binary String To Subsequences constructive algorithms, data structures, greedy, implementation	1500	x18283
1399C	Boats Competition brute force, greedy, two pointers	1200	x28877
1399B	Gifts Fixing greedy	800	x43527
1399A	Remove Smallest greedy, sortings	800	x66546
1398G	Running Competition bitmasks, fft, math, number theory	2600	x1108
1398F	Controversial Rounds binary search, data structures, dp, greedy, two pointers	2500	x1282
1398E	Two Types of Spells binary search, data structures, greedy, implementation, math, sortings	2200	x2422
1398D	Colored Rectangles dp, greedy, sortings	1800	x11489
1398C	Good Subarrays data structures, dp, math	1600	x26450
1398B	Substring Removal Game games, greedy, sortings	800	x24627
1398A	Bad Triangle geometry, math	800	x27540
1397B	Power Sequence brute force, math, number theory, sortings	1500	x14706
1397A	Juggling Letters greedy, strings	800	x28587
1396E	Distance Matching constructive algorithms, dfs and similar, trees	3200	x350
1396D	Rainbow Rectangles data structures, sortings, two pointers	3300	x308
1396C	Monster Invaders dp, greedy, implementation	2300	x2592
1396B	Stoned Game brute force, constructive algorithms, games, greedy	1800	x11402
1396A	Multiples of Length constructive algorithms, greedy, number theory	1600	x15443
1395C	Boboniu and Bit Operations bitmasks, brute force, dp, greedy	1600	x14125
1395B	Boboniu Plays Chess constructive algorithms	1100	x16058
1395A	Boboniu Likes to Color Balls brute force, math	1000	x24114
1394E	Boboniu and Banknote Collection strings	3500	x147
1394D	Boboniu and Jianghu dp, greedy, sortings, trees	2800	x1021
1394C	Boboniu and String binary search, geometry, ternary search	2600	x1089
1394B	Boboniu Walks on Graph brute force, dfs and similar, graphs, hashing	2300	x2010
1394A	Boboniu Chats with Du dp, greedy, sortings, two pointers	1800	x6770
1393E2	Twilight and Ancient Scroll (harder version) dp, hashing, implementation, string suffix structures, strings, two pointers	3200	x368
1393E1	Twilight and Ancient Scroll (easier version) dp, hashing, implementation, string suffix structures, strings	2800	x389
1393D	Rarity and New Dress dfs and similar, dp, implementation, shortest paths	2100	x4000
1393C	Pinkie Pie Eats Patty-cakes constructive algorithms, greedy, math, sortings	1700	x10630
1393B	Applejack and Storages constructive algorithms, data structures, greedy, implementation	1400	x16704
1393A	Rainbow Dash, Fluttershy and Chess Coloring greedy, math	800	x20515
1392I	Kevin and Grid fft, graphs, math	3300	x204
1392H	ZS Shuffles Cards combinatorics, dp, math, probabilities	3000	x722
1392G	Omkar and Pies bitmasks, dfs and similar, dp, math, shortest paths	2900	x486
1392F	Omkar and Landslide binary search, constructive algorithms, data structures, greedy, math	2400	x2150
1392E	Omkar and Duck bitmasks, constructive algorithms, interactive, math	2100	x3531
1392D	Omkar and Bed Wars dp, greedy	1700	x8946
1392C	Omkar and Waterslide greedy, implementation	1200	x18786
1392B	Omkar and Infinity Clock implementation, math	800	x18479
1392A	Omkar and Password greedy, math	800	x20600
1391E	Pairs of Pairs constructive algorithms, dfs and similar, graphs, greedy, trees	2600	x1714
1391D	505 bitmasks, brute force, constructive algorithms, dp, greedy, implementation	2000	x5278
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x15019
1391B	Fix You brute force, greedy, implementation	800	x27249
1391A	Suborrays constructive algorithms, math	800	x24378
1389G	Directing Edges dfs and similar, dp, graphs, trees	2800	x395
1389F	Bicolored Segments data structures, dp, graph matchings, sortings	2600	x980
1389E	Calendar Ambiguity math, number theory	2200	x3447
1389D	Segment Intersections brute force, greedy, implementation, math	2100	x4311
1389C	Good String brute force, dp, greedy, two pointers	1500	x19024
1389B	Array Walk brute force, dp, greedy	1600	x16777
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x41340
1388E	Uncle Bogdan and Projections data structures, geometry, sortings	2700	x591
1388D	Captain Flint and Treasure data structures, dfs and similar, graphs, greedy, implementation, trees	2000	x6424
1388C	Uncle Bogdan and Country Happiness dfs and similar, greedy, math, trees	1800	x9723
1388B	Captain Flint and a Long Voyage greedy, math	1000	x22278
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x24917
1387C	Viruses *special problem, dp, shortest paths, string suffix structures	2900	x131
1387B2	Village (Maximum) *special problem, dfs and similar, trees	2500	x904
1387B1	Village (Minimum) *special problem, dp, greedy, trees	2100	x1461
1387A	Graph *special problem, binary search, dfs and similar, dp, math, ternary search	2100	x712
1386C	Joker *special problem, bitmasks, data structures, divide and conquer, dsu	2800	x521