Problemset - Codeforces

→ Pay attention

Before contest
Educational Codeforces Round 175 (Rated for Div. 2)
13:30:20
Register now »

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1398A	Bad Triangle geometry, math	800	x27903
1397B	Power Sequence brute force, math, number theory, sortings	1500	x14948
1397A	Juggling Letters greedy, strings	800	x28932
1396E	Distance Matching constructive algorithms, dfs and similar, trees	3200	x359
1396D	Rainbow Rectangles data structures, sortings, two pointers	3300	x325
1396C	Monster Invaders dp, greedy, implementation	2300	x2650
1396B	Stoned Game brute force, constructive algorithms, games, greedy	1800	x11677
1396A	Multiples of Length constructive algorithms, greedy, number theory	1600	x15772
1395C	Boboniu and Bit Operations bitmasks, brute force, dp, greedy	1600	x14406
1395B	Boboniu Plays Chess constructive algorithms	1100	x16150
1395A	Boboniu Likes to Color Balls brute force, math	1000	x24505
1394E	Boboniu and Banknote Collection strings	3500	x153
1394D	Boboniu and Jianghu dp, greedy, sortings, trees	2800	x1062
1394C	Boboniu and String binary search, geometry, ternary search	2600	x1136
1394B	Boboniu Walks on Graph brute force, dfs and similar, graphs, hashing	2300	x2055
1394A	Boboniu Chats with Du dp, greedy, sortings, two pointers	1800	x6868
1393E2	Twilight and Ancient Scroll (harder version) dp, hashing, implementation, string suffix structures, strings, two pointers	3200	x386
1393E1	Twilight and Ancient Scroll (easier version) dp, hashing, implementation, string suffix structures, strings	2800	x396
1393D	Rarity and New Dress dfs and similar, dp, implementation, shortest paths	2100	x4042
1393C	Pinkie Pie Eats Patty-cakes constructive algorithms, greedy, math, sortings	1700	x10733
1393B	Applejack and Storages constructive algorithms, data structures, greedy, implementation	1400	x16913
1393A	Rainbow Dash, Fluttershy and Chess Coloring greedy, math	800	x20615
1392I	Kevin and Grid fft, graphs, math	3300	x210
1392H	ZS Shuffles Cards combinatorics, dp, math, probabilities	3000	x804
1392G	Omkar and Pies bitmasks, dfs and similar, dp, math, shortest paths	2900	x606
1392F	Omkar and Landslide binary search, constructive algorithms, data structures, greedy, math	2400	x2242
1392E	Omkar and Duck bitmasks, constructive algorithms, interactive, math	2100	x3598
1392D	Omkar and Bed Wars dp, greedy	1700	x9179
1392C	Omkar and Waterslide greedy, implementation	1200	x19045
1392B	Omkar and Infinity Clock implementation, math	800	x18573
1392A	Omkar and Password greedy, math	800	x20936
1391E	Pairs of Pairs constructive algorithms, dfs and similar, graphs, greedy, trees	2600	x1759
1391D	505 bitmasks, brute force, constructive algorithms, dp, greedy, implementation	2000	x5411
1391C	Cyclic Permutations combinatorics, dp, graphs, math	1500	x15235
1391B	Fix You brute force, greedy, implementation	800	x28001
1391A	Suborrays constructive algorithms, math	800	x24575
1389G	Directing Edges dfs and similar, dp, graphs, trees	2800	x405
1389F	Bicolored Segments data structures, dp, graph matchings, sortings	2600	x1078
1389E	Calendar Ambiguity math, number theory	2200	x3516
1389D	Segment Intersections brute force, greedy, implementation, math	2100	x4374
1389C	Good String brute force, dp, greedy, two pointers	1500	x19415
1389B	Array Walk brute force, dp, greedy	1600	x17463
1389A	LCM Problem constructive algorithms, greedy, math, number theory	800	x43484
1388E	Uncle Bogdan and Projections data structures, geometry, sortings	2700	x598
1388D	Captain Flint and Treasure data structures, dfs and similar, graphs, greedy, implementation, trees	2000	x6537
1388C	Uncle Bogdan and Country Happiness dfs and similar, greedy, math, trees	1800	x9889
1388B	Captain Flint and a Long Voyage greedy, math	1000	x22439
1388A	Captain Flint and Crew Recruitment brute force, greedy, math, number theory	800	x25127
1387C	Viruses *special problem, dp, shortest paths, string suffix structures	2900	x147
1387B2	Village (Maximum) *special problem, dfs and similar, trees	2500	x990
1387B1	Village (Minimum) *special problem, dp, greedy, trees	2100	x1572
1387A	Graph *special problem, binary search, dfs and similar, dp, math, ternary search	2100	x764
1386C	Joker *special problem, bitmasks, data structures, divide and conquer, dsu	2800	x580
1386B	Mixture *special problem, data structures, geometry, math, sortings	2900	x126
1386A	Colors *special problem, binary search, constructive algorithms, interactive	2700	x316
1385G	Columns Swaps 2-sat, dfs and similar, dsu, graphs, implementation	2300	x1592
1385F	Removing Leaves data structures, greedy, implementation, trees	2300	x2631
1385E	Directing Edges constructive algorithms, dfs and similar, graphs	2000	x7777
1385D	a-Good String bitmasks, brute force, divide and conquer, dp, implementation	1500	x19790
1385C	Make It Good greedy	1200	x27530
1385B	Restore the Permutation by Merger greedy	800	x37796
1385A	Three Pairwise Maximums math	800	x40221
1384B2	Koa and the Beach (Hard Version) constructive algorithms, dp, greedy, implementation	2200	x2524
1384B1	Koa and the Beach (Easy Version) brute force, dp, greedy	1900	x3964
1384A	Common Prefixes constructive algorithms, greedy, strings	1200	x18998
1383F	Special Edges flows, graphs	3200	x383
1383E	Strange Operation combinatorics, data structures, dp	2800	x911
1383D	Rearrange brute force, constructive algorithms, graphs, greedy, sortings	2800	x697
1383C	String Transformation 2 bitmasks, dp, graphs, trees	3100	x594
1383B	GameGame bitmasks, constructive algorithms, dp, games, greedy, math	1900	x5169
1383A	String Transformation 1 dsu, graphs, greedy, sortings, strings, trees, two pointers	1700	x10801
1382B	Sequential Nim dp, games	1100	x25019
1382A	Common Subsequence brute force	800	x26701
1381E	Origami geometry, math, sortings	3300	x271
1381D	The Majestic Brown Tree Snake dfs and similar, dp, greedy, trees, two pointers	3000	x729
1381C	Mastermind constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers	2500	x1651
1381B	Unmerge dp	1800	x9075
1381A2	Prefix Flip (Hard Version) constructive algorithms, data structures, implementation, strings, two pointers	1700	x13533
1381A1	Prefix Flip (Easy Version) constructive algorithms, data structures, strings	1300	x20819
1380G	Circular Dungeon greedy, math, probabilities	2600	x837
1380F	Strange Addition data structures, dp, matrices	2600	x825
1380E	Merging Towers data structures, dsu, implementation, trees	2300	x2265
1380D	Berserk And Fireball constructive algorithms, greedy, implementation, math, two pointers	2000	x4764
1380C	Create The Teams brute force, dp, greedy, implementation, sortings	1400	x21225
1380B	Universal Solution greedy	1400	x14798
1380A	Three Indices brute force, data structures	900	x28019
1379F2	Chess Strikes Back (hard version) data structures, divide and conquer	2800	x520
1379F1	Chess Strikes Back (easy version) binary search, data structures	2700	x621
1379E	Inverse Genealogy constructive algorithms, divide and conquer, dp, math, trees	2800	x436
1379D	New Passenger Trams binary search, brute force, data structures, sortings, two pointers	2300	x1098
1379C	Choosing flowers binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers	2000	x5696
1379B	Dubious Cyrpto binary search, brute force, math, number theory	1500	x12819
1379A	Acacius and String brute force, implementation, strings	1500	x12044
1375I	Cubic Lattice geometry, math, matrices, number theory	3500	x266
1375H	Set Merging constructive algorithms, divide and conquer	3300	x453
1375G	Tree Modification brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees	2800	x2005
1375F	Integer Game constructive algorithms, games, interactive, math	2600	x2307
1375E	Inversion SwapSort constructive algorithms, greedy, sortings	2500	x3138
1375D	Replace by MEX brute force, constructive algorithms, sortings	1900	x9428
1375C	Element Extermination constructive algorithms, data structures, greedy	1400	x21630