Problemset - Codeforces

→ Pay attention

Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
21:04:25
Register now »

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1393E1	Twilight and Ancient Scroll (easier version) dp, hashing, implementation, string suffix structures, strings	2800	x392
1393D	Rarity and New Dress dfs and similar, dp, implementation, shortest paths	2100	x4024
1393C	Pinkie Pie Eats Patty-cakes constructive algorithms, greedy, math, sortings	1700	x10680
1393B	Applejack and Storages constructive algorithms, data structures, greedy, implementation	1400	x16819
1393A	Rainbow Dash, Fluttershy and Chess Coloring greedy, math	800	x20576
1392I	Kevin and Grid fft, graphs, math	3300	x205
1392H	ZS Shuffles Cards combinatorics, dp, math, probabilities	3000	x789
1392G	Omkar and Pies bitmasks, dfs and similar, dp, math, shortest paths	2900	x519
1392F	Omkar and Landslide binary search, constructive algorithms, data structures, greedy, math	2400	x2191
1392E	Omkar and Duck bitmasks, constructive algorithms, interactive, math	2100	x3555
1392D	Omkar and Bed Wars dp, greedy	1700	x9052
1392C	Omkar and Waterslide greedy, implementation	1200	x18960
1392B	Omkar and Infinity Clock implementation, math	800	x18545
1392A	Omkar and Password greedy, math	800	x20862
1391E	Pairs of Pairs constructive algorithms, dfs and similar, graphs, greedy, trees	2600	x1729
1391D	505 bitmasks, brute force, constructive algorithms, dp, greedy, implementation	2000	x5365
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x15133
1391B	Fix You brute force, greedy, implementation	800	x27657
1391A	Suborrays constructive algorithms, math	800	x24500
1389G	Directing Edges dfs and similar, dp, graphs, trees	2800	x402
1389F	Bicolored Segments data structures, dp, graph matchings, sortings	2600	x1055
1389E	Calendar Ambiguity math, number theory	2200	x3485
1389D	Segment Intersections brute force, greedy, implementation, math	2100	x4353
1389C	Good String brute force, dp, greedy, two pointers	1500	x19198
1389B	Array Walk brute force, dp, greedy	1600	x17081
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x42397
1388E	Uncle Bogdan and Projections data structures, geometry, sortings	2700	x595
1388D	Captain Flint and Treasure data structures, dfs and similar, graphs, greedy, implementation, trees	2000	x6482
1388C	Uncle Bogdan and Country Happiness dfs and similar, greedy, math, trees	1800	x9808
1388B	Captain Flint and a Long Voyage greedy, math	1000	x22361
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x25044
1387C	Viruses *special problem, dp, shortest paths, string suffix structures	2900	x145
1387B2	Village (Maximum) *special problem, dfs and similar, trees	2500	x948
1387B1	Village (Minimum) *special problem, dp, greedy, trees	2100	x1519
1387A	Graph *special problem, binary search, dfs and similar, dp, math, ternary search	2100	x749
1386C	Joker *special problem, bitmasks, data structures, divide and conquer, dsu	2800	x563
1386B	Mixture *special problem, data structures, geometry, math, sortings	2900	x124
1386A	Colors *special problem, binary search, constructive algorithms, interactive	2700	x309
1385G	Columns Swaps 2-sat, dfs and similar, dsu, graphs, implementation	2300	x1576
1385F	Removing Leaves data structures, greedy, implementation, trees	2300	x2595
1385E	Directing Edges constructive algorithms, dfs and similar, graphs	2000	x7617
1385D	a-Good String bitmasks, brute force, divide and conquer, dp, implementation	1500	x19564
1385C	Make It Good greedy	1200	x27285
1385B	Restore the Permutation by Merger greedy	800	x37520
1385A	Three Pairwise Maximums math	800	x39734
1384B2	Koa and the Beach (Hard Version) constructive algorithms, dp, greedy, implementation	2200	x2514
1384B1	Koa and the Beach (Easy Version) brute force, dp, greedy	1900	x3947
1384A	Common Prefixes constructive algorithms, greedy, strings	1200	x18893
1383F	Special Edges flows, graphs	3200	x366
1383E	Strange Operation combinatorics, data structures, dp	2800	x794
1383D	Rearrange brute force, constructive algorithms, graphs, greedy, sortings	2800	x692
1383C	String Transformation 2 bitmasks, dp, graphs, trees	3100	x580
1383B	GameGame bitmasks, constructive algorithms, dp, games, greedy, math	1900	x5133
1383A	String Transformation 1 dsu, graphs, greedy, sortings, strings, trees, two pointers	1700	x10737
1382B	Sequential Nim dp, games	1100	x24830
1382A	Common Subsequence brute force	800	x26632
1381E	Origami geometry, math, sortings	3300	x268
1381D	The Majestic Brown Tree Snake dfs and similar, dp, greedy, trees, two pointers	3000	x686
1381C	Mastermind constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers	2500	x1644
1381B	Unmerge dp	1800	x9003
1381A2	Prefix Flip (Hard Version) constructive algorithms, data structures, implementation, strings, two pointers	1700	x13401
1381A1	Prefix Flip (Easy Version) constructive algorithms, data structures, strings	1300	x20665
1380G	Circular Dungeon greedy, math, probabilities	2600	x832
1380F	Strange Addition data structures, dp, matrices	2600	x819
1380E	Merging Towers data structures, dsu, implementation, trees	2300	x2205
1380D	Berserk And Fireball constructive algorithms, greedy, implementation, math, two pointers	2000	x4724
1380C	Create The Teams brute force, dp, greedy, implementation, sortings	1400	x20972
1380B	Universal Solution greedy	1400	x14702
1380A	Three Indices brute force, data structures	900	x26745
1379F2	Chess Strikes Back (hard version) data structures, divide and conquer	2800	x514
1379F1	Chess Strikes Back (easy version) binary search, data structures	2700	x608
1379E	Inverse Genealogy constructive algorithms, divide and conquer, dp, math, trees	2800	x434
1379D	New Passenger Trams binary search, brute force, data structures, sortings, two pointers	2300	x1091
1379C	Choosing flowers binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers	2000	x5648
1379B	Dubious Cyrpto binary search, brute force, math, number theory	1500	x12755
1379A	Acacius and String brute force, implementation, strings	1500	x12004
1375I	Cubic Lattice geometry, math, matrices, number theory	3500	x265
1375H	Set Merging constructive algorithms, divide and conquer	3300	x437
1375G	Tree Modification brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees	2800	x1982
1375F	Integer Game constructive algorithms, games, interactive, math	2600	x2284
1375E	Inversion SwapSort constructive algorithms, greedy, sortings	2500	x3110
1375D	Replace by MEX brute force, constructive algorithms, sortings	1900	x9344
1375C	Element Extermination constructive algorithms, data structures, greedy	1400	x21412
1375B	Neighbor Grid constructive algorithms, greedy	1200	x17342
1375A	Sign Flipping constructive algorithms, math	1100	x18438
1374F	Cyclic Shifts Sorting brute force, constructive algorithms, implementation, sortings	2400	x1308
1374E2	Reading Books (hard version) data structures, greedy, implementation, sortings, ternary search, two pointers	2500	x946
1374E1	Reading Books (easy version) data structures, greedy, sortings	1600	x14124
1374D	Zero Remainder Array math, sortings, two pointers	1400	x24340
1374C	Move Brackets greedy, strings	1000	x48348
1374B	Multiply by 2, divide by 6 math	900	x52243
1374A	Required Remainder math	800	x54973
1373G	Pawns data structures, divide and conquer, greedy	2600	x808
1373F	Network Coverage binary search, constructive algorithms, data structures, greedy	2400	x1685
1373E	Sum of Digits brute force, constructive algorithms, dp, greedy	2200	x2765
1373D	Maximum Sum on Even Positions divide and conquer, dp, greedy, implementation	1600	x15799
1373C	Pluses and Minuses math	1300	x18479
1373B	01 Game games	900	x37122
1373A	Donut Shops greedy, implementation, math	1000	x27370
1372F	Omkar and Modes binary search, divide and conquer, interactive	2700	x451