Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Difficulty: —

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Problems

#	Name
1941A	Rudolf and the Ticket brute force, math	800	x42094
1940D	Almost Certainly *special problem, constructive algorithms, data structures, sortings		x143
1940C	Burenka and Pether *special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees		x35
1940B	Three Arrays *special problem, constructive algorithms, implementation, sortings		x198
1940A	Parallel Universes *special problem, constructive algorithms, dfs and similar, dsu, graphs		x83
1939D	Big Persimmon *special problem, dp, games		x87
1939C	More Gifts *special problem, dfs and similar, two pointers		x302
1939B	Evidence Board *special problem, constructive algorithms, dfs and similar, graphs, trees		x234
1939A	Draw Polygon Lines *special problem, constructive algorithms, dp, geometry, interactive		x24
1938M	Zig-zag	3500	x57
1938L	XOR Operations	2800	x291
1938K	Tree Quiz	2400	x621
1938J	There and Back Again	2100	x1270
1938I	Symmetric Boundary	2800	x75
1938H	Pho Restaurant	1600	x2119
1938G	Personality Test	2300	x1040
1938F	Forming Groups	2400	x742
1938E	Duplicates	2200	x997
1938D	Bánh Bò	3300	x90
1938C	Bit Counting Sequence	1900	x1452
1938B	Attraction Score	3000	x192
1938A	Antiparticle Antiphysics	3500	x52
1937B	Binary Path dp, greedy, implementation	1300	x14872
1937A	Shuffle Party implementation, math	800	x23003
1936F	Grand Finale: Circles binary search, geometry	3300	x142
1936E	Yet Yet Another Permutation Problem divide and conquer, fft, math	3400	x112
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x503
1936C	Pokémon Arena data structures, graphs, greedy, implementation, shortest paths, sortings	2400	x1302
1936B	Pinball binary search, data structures, implementation, math, two pointers	2000	x2868
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x7379
1935F	Andrey's Tree binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees	2800	x443
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1350
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x8148
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x8094
1935B	Informatics in MAC constructive algorithms	1200	x18358
1935A	Entertainment in MAC constructive algorithms, strings	800	x27776
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x234
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1378
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x3473
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x6724
1934B	Yet Another Coin Problem brute force, dp, greedy, math	1200	x18692
1934A	Too Min Too Max greedy, math	800	x25209
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x969
1933F	Turtle Mission: Robot and the Earthquake dfs and similar, dp, graphs, shortest paths	2100	x2468
1933E	Turtle vs. Rabbit Race: Optimal Trainings binary search, implementation, math, ternary search	1500	x11108
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x20059
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x22459
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x32671
1933A	Turtle Puzzle: Rearrange and Negate greedy, math, sortings	800	x37882
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x1062
1932F	Feed Cats data structures, dp, sortings	1900	x4066
1932E	Final Countdown implementation, math, number theory	1600	x8086
1932D	Card Game greedy, implementation	1400	x11337
1932C	LR-remainders brute force, data structures, implementation, math, two pointers	1400	x15585
1932B	Chaya Calendar number theory	1100	x20565
1932A	Thorns and Coins dp, greedy, implementation	800	x29313
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2786
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x7951
1931E	Anna and the Valentine's Day Gift games, greedy, math, sortings	1400	x15665
1931D	Divisible Pairs combinatorics, math, number theory	1300	x18663
1931C	Make Equal Again brute force, greedy, math	1000	x28856
1931B	Make Equal greedy	800	x31986
1931A	Recovering a Small String brute force, strings	800	x35942
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	x335
1930F	Maximize the Difference bitmasks, brute force, dfs and similar	2700	x706
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x1123
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2611
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x4082
1930C	Lexicographically Largest binary search, constructive algorithms, data structures, greedy, sortings	1700	x7005
1930B	Permutation Printing brute force, constructive algorithms, math	1000	x15122
1930A	Maximise The Score greedy, sortings	800	x18447
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1784
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1670
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4738
1929C	Sasha and the Casino binary search, brute force, constructive algorithms, games, greedy, math	1400	x14720
1929B	Sasha and the Drawing constructive algorithms, greedy, math	800	x25120
1929A	Sasha and the Beautiful Array constructive algorithms, greedy, math, sortings	800	x31254
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x238
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1696
1928D	Lonely Mountain Dungeons brute force, data structures, greedy, math, ternary search	1900	x4221
1928C	Physical Education Lesson brute force, math, number theory	1600	x8467
1928B	Equalize binary search, greedy, sortings, two pointers	1200	x17247
1928A	Rectangle Cutting geometry, math	800	x22457
1927G	Paint Charges data structures, dp, greedy, math	2300	x1654
1927F	Microcycle data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees	1900	x4317
1927E	Klever Permutation constructive algorithms, math, two pointers	1400	x13890
1927D	Find the Different Ones! binary search, brute force, data structures, dp, dsu, greedy, two pointers	1300	x21235
1927C	Choose the Different Ones! brute force, greedy, math	1000	x27738
1927B	Following the String constructive algorithms, greedy, strings	900	x32900
1927A	Make it White greedy, strings	800	x42740
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x3509
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1691
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x11787
1926D	Vlad and Division bitmasks, greedy	1300	x15395
1926C	Vlad and a Sum of Sum of Digits dp, implementation	1200	x26391
1926B	Vlad and Shapes geometry, implementation	800	x32233
1926A	Vlad and the Best of Five implementation	800	x47465
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3620