Problemset - Codeforces

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

→ Pay attention

Before contest
Codeforces Round 976 (Div. 2) and Divide By Zero 9.0
12:00:13
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1938J	There and Back Again	2100	x1266
1938I	Symmetric Boundary	2800	x74
1938H	Pho Restaurant	1600	x2115
1938G	Personality Test	2300	x1039
1938F	Forming Groups	2400	x741
1938E	Duplicates	2200	x992
1938D	Bánh Bò	3300	x90
1938C	Bit Counting Sequence	1900	x1447
1938B	Attraction Score	3000	x192
1938A	Antiparticle Antiphysics	3500	x52
1936F	Grand Finale: Circles binary search, geometry	3300	x142
1936E	Yet Yet Another Permutation Problem divide and conquer, fft, math	3400	x111
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x499
1936C	Pokémon Arena data structures, graphs, greedy, implementation, shortest paths, sortings	2400	x1294
1936B	Pinball binary search, data structures, implementation, math, two pointers	2000	x2850
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x7342
1935F	Andrey's Tree binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees	2800	x441
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1342
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x8122
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x8065
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x230
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1368
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x3458
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x6696
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x967
1933F	Turtle Mission: Robot and the Earthquake dfs and similar, dp, graphs, shortest paths	2100	x2460
1933E	Turtle vs. Rabbit Race: Optimal Trainings binary search, implementation, math, ternary search	1500	x11057
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x1059
1932F	Feed Cats data structures, dp, sortings	1900	x4045
1932E	Final Countdown implementation, math, number theory	1600	x8044
1932D	Card Game greedy, implementation	1400	x11296
1932C	LR-remainders brute force, data structures, implementation, math, two pointers	1400	x15515
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2771
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x7918
1931E	Anna and the Valentine's Day Gift games, greedy, math, sortings	1400	x15578
1930I	Counting Is Fun combinatorics	3500	x70
1930H	Interactive Mex Tree constructive algorithms, dfs and similar, interactive, trees	3300	x152
1930G	Prefix Max Set Counting data structures, dp, trees	3100	x334
1930F	Maximize the Difference bitmasks, brute force, dfs and similar	2700	x704
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x1117
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2602
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x4068
1930C	Lexicographically Largest binary search, constructive algorithms, data structures, greedy, sortings	1700	x6969
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1777
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1663
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4706
1929C	Sasha and the Casino binary search, brute force, constructive algorithms, games, greedy, math	1400	x14648
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x238
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1692
1928D	Lonely Mountain Dungeons brute force, data structures, greedy, math, ternary search	1900	x4208
1928C	Physical Education Lesson brute force, math, number theory	1600	x8420
1927G	Paint Charges data structures, dp, greedy, math	2300	x1651
1927F	Microcycle data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees	1900	x4299
1927E	Klever Permutation constructive algorithms, math, two pointers	1400	x13835
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x3497
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1685
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x11715
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3598
1924F	Anti-Proxy Attendance constructive algorithms, dp, interactive, ternary search	3500	x151
1924E	Paper Cutting Again combinatorics, probabilities	3100	x432
1924D	Balanced Subsequences combinatorics, dp, math	2700	x997
1924C	Fractal Origami geometry, math, matrices	2400	x1148
1924B	Space Harbour data structures, implementation, math, sortings	2100	x2515
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x13788
1923F	Shrink-Reverse binary search, brute force, greedy, hashing, implementation, string suffix structures, strings	2800	x371
1923E	Count Paths data structures, dfs and similar, dp, dsu, graphs, trees	2000	x3756
1923D	Slimes binary search, constructive algorithms, data structures, greedy, two pointers	1800	x6670
1923C	Find B constructive algorithms, greedy	1400	x14889
1922F	Replace on Segment dp, graph matchings	2500	x1389
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x7623
1922D	Berserk Monsters brute force, data structures, dsu, implementation, math	1900	x5634
1921G	Mischievous Shooter brute force, data structures, divide and conquer, dp, implementation	2200	x1231
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x3806
1921E	Eat the Chip brute force, games, greedy, math	1600	x9711
1920F2	Smooth Sailing (Hard Version) binary search, data structures, dsu, geometry, graphs, trees	3000	x458
1920F1	Smooth Sailing (Easy Version) binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths	2500	x953
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2668
1920D	Array Repetition binary search, brute force, dsu, implementation, math	1900	x5546
1920C	Partitioning the Array brute force, math, number theory	1600	x13381
1919H	Tree Diameter interactive, trees	2000	x142
1919G	Tree LGM constructive algorithms, divide and conquer, games, trees	3500	x179
1919F2	Wine Factory (Hard Version) data structures, dp, flows, greedy, matrices	2800	x821
1919F1	Wine Factory (Easy Version) data structures, greedy	2300	x2162
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x850
1919D	01 Tree constructive algorithms, data structures, dsu, greedy, sortings, trees	2100	x3845
1919C	Grouping Increases data structures, dp, greedy	1400	x18779
1918G	Permutation of Given constructive algorithms, math	2700	x461
1918F	Caterpillar on a Tree dfs and similar, graphs, greedy, implementation, sortings, trees	2500	x864
1918E	ace5 and Task Order constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings	2200	x1711
1918D	Blocking Elements binary search, data structures, dp, implementation, two pointers	1900	x4731
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x13836
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x952
1917E	Construct Matrix constructive algorithms, math	2500	x1368
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1776
1917C	Watering an Array brute force, greedy, implementation, math	1600	x10347
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x534
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x614
1916G	Optimizations From Chelsu divide and conquer, dp, number theory, trees	3500	x147
1916F	Group Division constructive algorithms, dfs and similar, graphs, greedy	2900	x451
1916E	Happy Life in University data structures, dfs and similar, greedy, trees	2300	x2239