Problemset - Codeforces

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Educational Codeforces Round 170 (Rated for Div. 2)
13 days

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Difficulty: —

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Problems

#	Name
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	x619
1938J	There and Back Again	2100	x1267
1938I	Symmetric Boundary	2800	x74
1938H	Pho Restaurant	1600	x2116
1938G	Personality Test	2300	x1040
1938F	Forming Groups	2400	x741
1938E	Duplicates	2200	x992
1938D	Bánh Bò	3300	x90
1938C	Bit Counting Sequence	1900	x1448
1938B	Attraction Score	3000	x192
1938A	Antiparticle Antiphysics	3500	x52
1937B	Binary Path dp, greedy, implementation	1300	x14835
1937A	Shuffle Party implementation, math	800	x22973
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	x501
1936C	Pokémon Arena data structures, graphs, greedy, implementation, shortest paths, sortings	2400	x1295
1936B	Pinball binary search, data structures, implementation, math, two pointers	2000	x2853
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x7351
1935F	Andrey's Tree binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees	2800	x442
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1344
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x8130
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x8077
1935B	Informatics in MAC constructive algorithms	1200	x18321
1935A	Entertainment in MAC constructive algorithms, strings	800	x27741
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x231
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1372
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x3465
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x6706
1934B	Yet Another Coin Problem brute force, dp, greedy, math	1200	x18645
1934A	Too Min Too Max greedy, math	800	x25181
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	x2461
1933E	Turtle vs. Rabbit Race: Optimal Trainings binary search, implementation, math, ternary search	1500	x11073
1933D	Turtle Tenacity: Continual Mods constructive algorithms, greedy, math, number theory, sortings	1200	x20005
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x22423
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x32630
1933A	Turtle Puzzle: Rearrange and Negate greedy, math, sortings	800	x37833
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x1059
1932F	Feed Cats data structures, dp, sortings	1900	x4051
1932E	Final Countdown implementation, math, number theory	1600	x8057
1932D	Card Game greedy, implementation	1400	x11308
1932C	LR-remainders brute force, data structures, implementation, math, two pointers	1400	x15532
1932B	Chaya Calendar number theory	1100	x20527
1932A	Thorns and Coins dp, greedy, implementation	800	x29256
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2779
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x7927
1931E	Anna and the Valentine's Day Gift games, greedy, math, sortings	1400	x15609
1931D	Divisible Pairs combinatorics, math, number theory	1300	x18585
1931C	Make Equal Again brute force, greedy, math	1000	x28799
1931B	Make Equal greedy	800	x31954
1931A	Recovering a Small String brute force, strings	800	x35898
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	x1119
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2606
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x4073
1930C	Lexicographically Largest binary search, constructive algorithms, data structures, greedy, sortings	1700	x6980
1930B	Permutation Printing brute force, constructive algorithms, math	1000	x15095
1930A	Maximise The Score greedy, sortings	800	x18423
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1781
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1666
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4713
1929C	Sasha and the Casino binary search, brute force, constructive algorithms, games, greedy, math	1400	x14673
1929B	Sasha and the Drawing constructive algorithms, greedy, math	800	x25089
1929A	Sasha and the Beautiful Array constructive algorithms, greedy, math, sortings	800	x31204
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x238
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1693
1928D	Lonely Mountain Dungeons brute force, data structures, greedy, math, ternary search	1900	x4211
1928C	Physical Education Lesson brute force, math, number theory	1600	x8436
1928B	Equalize binary search, greedy, sortings, two pointers	1200	x17190
1928A	Rectangle Cutting geometry, math	800	x22424
1927G	Paint Charges data structures, dp, greedy, math	2300	x1652
1927F	Microcycle data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees	1900	x4305
1927E	Klever Permutation constructive algorithms, math, two pointers	1400	x13856
1927D	Find the Different Ones! binary search, brute force, data structures, dp, dsu, greedy, two pointers	1300	x21170
1927C	Choose the Different Ones! brute force, greedy, math	1000	x27701
1927B	Following the String constructive algorithms, greedy, strings	900	x32854
1927A	Make it White greedy, strings	800	x42658
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x3502
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1690
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x11740
1926D	Vlad and Division bitmasks, greedy	1300	x15346
1926C	Vlad and a Sum of Sum of Digits dp, implementation	1200	x26292
1926B	Vlad and Shapes geometry, implementation	800	x32185
1926A	Vlad and the Best of Five implementation	800	x47300
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3607
1925B	A Balanced Problemset? brute force, greedy, math, number theory	1200	x19856
1925A	We Got Everything Covered! constructive algorithms, greedy, strings	800	x28548
1924F	Anti-Proxy Attendance constructive algorithms, dp, interactive, ternary search	3500	x151
1924E	Paper Cutting Again combinatorics, probabilities	3100	x434
1924D	Balanced Subsequences combinatorics, dp, math	2700	x1001
1924C	Fractal Origami geometry, math, matrices	2400	x1153
1924B	Space Harbour data structures, implementation, math, sortings	2100	x2523
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x13802