Problemset - Codeforces

→ Pay attention

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

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1941E	Rudolf and k Bridges binary search, data structures, dp, two pointers	1600	x8828
1941D	Rudolf and the Ball Game dfs and similar, dp, implementation	1200	x17505
1941C	Rudolf and the Ugly String dp, greedy, strings	900	x31515
1941B	Rudolf and 121 brute force, dp, greedy, math	1000	x28035
1941A	Rudolf and the Ticket brute force, math	800	x40650
1940D	Almost Certainly *special problem, constructive algorithms, data structures, sortings		x126
1940C	Burenka and Pether *special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees		x33
1940B	Three Arrays *special problem, constructive algorithms, implementation, sortings		x181
1940A	Parallel Universes *special problem, constructive algorithms, dfs and similar, dsu, graphs		x81
1939D	Big Persimmon *special problem, dp, games		x84
1939C	More Gifts *special problem, dfs and similar, two pointers		x286
1939B	Evidence Board *special problem, constructive algorithms, dfs and similar, graphs, trees		x214
1939A	Draw Polygon Lines *special problem, constructive algorithms, dp, geometry, interactive		x20
1938M	Zig-zag	3500	x47
1938L	XOR Operations	2800	x257
1938K	Tree Quiz	2400	x552
1938J	There and Back Again	2100	x1149
1938I	Symmetric Boundary	2800	x55
1938H	Pho Restaurant	1600	x1947
1938G	Personality Test	2300	x909
1938F	Forming Groups	2400	x672
1938E	Duplicates	2200	x891
1938D	Bánh Bò	3300	x82
1938C	Bit Counting Sequence	1900	x1318
1938B	Attraction Score	3000	x171
1938A	Antiparticle Antiphysics	3500	x44
1937B	Binary Path dp, greedy, implementation	1300	x14004
1937A	Shuffle Party implementation, math	800	x22345
1936F	Grand Finale: Circles binary search, geometry	3300	x74
1936E	Yet Yet Another Permutation Problem divide and conquer, fft, math	3400	x103
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x458
1936C	Pokémon Arena data structures, graphs, greedy, implementation, shortest paths, sortings	2400	x1175
1936B	Pinball binary search, data structures, implementation, math, two pointers	2000	x2597
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x6932
1935F	Andrey's Tree binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees	2800	x415
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1240
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x7712
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x7584
1935B	Informatics in MAC constructive algorithms	1200	x17460
1935A	Entertainment in MAC constructive algorithms, strings	800	x26678
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x203
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1266
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x3244
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x6351
1934B	Yet Another Coin Problem brute force, dp, greedy, math	1200	x17719
1934A	Too Min Too Max greedy, math	800	x24404
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x915
1933F	Turtle Mission: Robot and the Earthquake dfs and similar, dp, graphs, shortest paths	2100	x2327
1933E	Turtle vs. Rabbit Race: Optimal Trainings binary search, implementation, math, ternary search	1500	x10419
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x18965
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x21600
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x31201
1933A	Turtle Puzzle: Rearrange and Negate greedy, math, sortings	800	x36799
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x947
1932F	Feed Cats data structures, dp, sortings	1900	x3716
1932E	Final Countdown implementation, math, number theory	1600	x7497
1932D	Card Game greedy, implementation	1400	x10694
1932C	LR-remainders brute force, data structures, implementation, math, two pointers	1400	x14726
1932B	Chaya Calendar number theory	1100	x19616
1932A	Thorns and Coins dp, greedy, implementation	800	x28098
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2581
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x7415
1931E	Anna and the Valentine's Day Gift games, greedy, math, sortings	1400	x14380
1931D	Divisible Pairs combinatorics, math, number theory	1300	x17159
1931C	Make Equal Again brute force, greedy, math	1000	x27488
1931B	Make Equal greedy	800	x31092
1931A	Recovering a Small String brute force, strings	800	x34716
1930I	Counting Is Fun combinatorics	3500	x60
1930H	Interactive Mex Tree constructive algorithms, dfs and similar, interactive, trees	3300	x144
1930G	Prefix Max Set Counting data structures, dp, trees	3100	x318
1930F	Maximize the Difference bitmasks, brute force, dfs and similar	2700	x662
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x1051
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2483
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x3877
1930C	Lexicographically Largest binary search, constructive algorithms, data structures, greedy, sortings	1700	x6693
1930B	Permutation Printing brute force, constructive algorithms, math	1000	x14385
1930A	Maximise The Score greedy, sortings	800	x17853
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1697
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1581
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4412
1929C	Sasha and the Casino binary search, brute force, constructive algorithms, games, greedy, math	1400	x13960
1929B	Sasha and the Drawing constructive algorithms, greedy, math	800	x24483
1929A	Sasha and the Beautiful Array constructive algorithms, greedy, math, sortings	800	x30202
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x223
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1609
1928D	Lonely Mountain Dungeons brute force, data structures, greedy, math, ternary search	1900	x3974
1928C	Physical Education Lesson brute force, math, number theory	1600	x7992
1928B	Equalize binary search, greedy, sortings, two pointers	1200	x16238
1928A	Rectangle Cutting geometry, math	800	x21861
1927G	Paint Charges data structures, dp, greedy, math	2300	x1560
1927F	Microcycle data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees	1900	x4058
1927E	Klever Permutation constructive algorithms, math, two pointers	1400	x13152
1927D	Find the Different Ones! binary search, brute force, data structures, dp, dsu, greedy, two pointers	1300	x19632
1927C	Choose the Different Ones! brute force, greedy, math	1000	x26657
1927B	Following the String constructive algorithms, greedy, strings	900	x31631
1927A	Make it White greedy, strings	800	x41253
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x3263
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1591
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x10991
1926D	Vlad and Division bitmasks, greedy	1300	x14551