Problemset - Codeforces

Please read the new rule regarding the restriction on the use of AI tools. ×

→ Pay attention

Before contest
Codeforces Round 977 (Div. 2)
3 days
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1174E	Ehab and the Expected GCD Problem combinatorics, dp, math, number theory	2500	x1436
1174D	Ehab and the Expected XOR Problem bitmasks, constructive algorithms	1900	x4688
1174C	Ehab and a Special Coloring Problem constructive algorithms, number theory	1300	x11994
1174B	Ehab Is an Odd Person sortings	1200	x15445
1174A	Ehab Fails to Be Thanos constructive algorithms, greedy, sortings	1000	x17612
1173B	Nauuo and Chess constructive algorithms, greedy	1100	x9069
1173A	Nauuo and Votes greedy	800	x16213
1172F	Nauuo and Bug data structures	3300	x429
1172E	Nauuo and ODT data structures	3300	x309
1172D	Nauuo and Portals constructive algorithms	2900	x501
1172C2	Nauuo and Pictures (hard version) dp, probabilities	2600	x845
1172C1	Nauuo and Pictures (easy version) dp, probabilities	2300	x1080
1172B	Nauuo and Circle combinatorics, dfs and similar, dp, trees	1900	x4036
1172A	Nauuo and Cards greedy, implementation	1800	x4981
1170I	Good Subsets *special problem, dp		x40
1170H	Longest Saw *special problem, constructive algorithms		x48
1170G	Graph Decomposition *special problem, graphs		x74
1170F	Wheels *special problem, binary search, greedy		x122
1170E	Sliding Doors *special problem, binary search		x261
1170D	Decoding of Integer Sequences *special problem, data structures, implementation		x430
1170C	Minus and Minus Give Plus *special problem, implementation, strings		x794
1170B	Bad Days *special problem, implementation		x1085
1170A	Three Integers Again *special problem, math		x1470
1169B	Pairs graphs, implementation	1500	x9736
1169A	Circle Metro implementation, math	900	x11875
1168E	Xor Permutations constructive algorithms, math	3100	x375
1168D	Anagram Paths dp, implementation, trees	3000	x344
1168C	And Reachability bitmasks, dp	2200	x2410
1168B	Good Triple brute force, two pointers	1900	x3564
1168A	Increasing by Modulo binary search, greedy	1700	x6818
1167G	Low Budget Inception brute force, geometry	3100	x149
1167F	Scalar Queries combinatorics, data structures, math, sortings	2300	x1630
1167E	Range Deleting binary search, combinatorics, data structures, two pointers	2100	x2661
1167D	Bicolored RBS constructive algorithms, greedy	1500	x6953
1167C	News Distribution dfs and similar, dsu, graphs	1400	x18388
1167B	Lost Numbers brute force, divide and conquer, interactive, math	1400	x11651
1167A	Telephone Number brute force, greedy, strings	800	x19279
1166F	Vicky's Delivery Service data structures, dsu, graphs, hashing	2400	x702
1166E	The LCMs Must be Large bitmasks, brute force, constructive algorithms, math, number theory	2100	x2824
1166D	Cute Sequences binary search, brute force, greedy, math	2200	x2163
1166C	A Tale of Two Lands binary search, sortings, two pointers	1500	x9610
1166B	All the Vowels Please constructive algorithms, math, number theory	1100	x11471
1166A	Silent Classroom combinatorics, greedy	900	x14195
1165F2	Microtransactions (hard version) binary search, greedy, implementation	2000	x2180
1165F1	Microtransactions (easy version) binary search, greedy	2000	x1897
1165E	Two Arrays and Sum of Functions greedy, math, sortings	1600	x8303
1165D	Almost All Divisors math, number theory	1600	x16017
1165C	Good String greedy	1300	x12928
1165B	Polycarp Training data structures, greedy, sortings	1000	x20907
1165A	Remainder implementation, math	1100	x13777
1163F	Indecisive Taxi Fee data structures, graphs, shortest paths	3000	x883
1163E	Magical Permutation bitmasks, brute force, constructive algorithms, data structures, graphs, math	2400	x671
1163D	Mysterious Code dp, strings	2100	x1268
1163C2	Power Transmission (Hard Edition) data structures, geometry, implementation, math	1900	x3624
1163C1	Power Transmission (Easy Edition) brute force, geometry	1900	x3315
1163B2	Cat Party (Hard Edition) data structures, implementation	1600	x7218
1163B1	Cat Party (Easy Edition) data structures, implementation	1500	x6972
1163A	Eating Soup greedy, math	900	x12926
1162B	Double Matrix brute force, greedy	1400	x5803
1162A	Zoning Restrictions Again implementation	800	x8261
1160A2	Collaboration *special problem
1159B	Expansion coefficient of the array implementation, math	1300	x7054
1159A	A pile of stones implementation, math	800	x12664
1158F	Density of subarrays dp, math	3500	x410
1158E	Strange device binary search, interactive, math, trees	3400	x151
1158D	Winding polygonal line constructive algorithms, geometry, greedy, math	2600	x836
1158C	Permutation recovery constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings	2100	x1938
1158B	The minimal unique substring constructive algorithms, math, strings	2200	x2228
1158A	The Party and Sweets binary search, constructive algorithms, greedy, implementation, math, sortings, two pointers	1500	x7111
1157G	Inverse of Rows and Columns brute force, constructive algorithms	2200	x920
1157F	Maximum Balanced Circle constructive algorithms, dp, greedy, two pointers	2000	x2633
1157E	Minimum Array binary search, data structures, greedy	1700	x8373
1157D	N Problems During K Days constructive algorithms, greedy, math	1900	x3751
1157C2	Increasing Subsequence (hard version) greedy	1700	x7991
1157C1	Increasing Subsequence (easy version) greedy	1300	x12621
1157B	Long Number greedy	1300	x14691
1157A	Reachable Numbers implementation	1100	x15648
1156G	Optimizer graphs, greedy, hashing, implementation	2700	x132
1156F	Card Bag dp, math, probabilities	2300	x1397
1156E	Special Segments of Permutation data structures, divide and conquer, dsu, two pointers	2200	x3012
1156D	0-1-Tree dfs and similar, divide and conquer, dp, dsu, trees	2200	x3897
1156C	Match Points binary search, greedy, sortings, ternary search, two pointers	2000	x6088
1156B	Ugly Pairs dfs and similar, greedy, implementation, sortings, strings	1800	x6221
1156A	Inscribed Figures geometry	1400	x8203
1155F	Delivery Oligopoly brute force, dp, graphs	2800	x419
1155E	Guess the Root brute force, interactive, math	2200	x1431
1155D	Beautiful Array brute force, data structures, divide and conquer, dp, greedy	1900	x6916
1155C	Alarm Clocks Everywhere math, number theory	1300	x9229
1155B	Game with Telephone Numbers games, greedy, implementation	1200	x11883
1155A	Reverse a Substring implementation, sortings, strings	1000	x14970
1154G	Minimum Possible LCM brute force, greedy, math, number theory	2200	x2731
1154F	Shovels Shop dp, greedy, sortings	2100	x2840
1154E	Two Teams data structures, implementation, sortings	1800	x6264
1154D	Walking Robot greedy	1500	x9952
1154C	Gourmet Cat implementation, math	1400	x10390
1154B	Make Them Equal math	1200	x16602
1154A	Restoring Three Numbers math	800	x70551
1153F	Serval and Bonus Problem combinatorics, dp, math, probabilities	2600	x798
1153E	Serval and Snake binary search, brute force, interactive	2200	x1500
1153D	Serval and Rooted Tree binary search, dfs and similar, dp, greedy, trees	1900	x4986