Problemset - Codeforces

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IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2)
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Problems

#	Name
1938M	Zig-zag	3500	x63
1938L	XOR Operations	2800	x299
1938K	Tree Quiz	2400	x649
1938J	There and Back Again	2100	x1334
1938I	Symmetric Boundary	2800	x79
1938H	Pho Restaurant	1600	x2240
1938G	Personality Test	2300	x1088
1938F	Forming Groups	2400	x782
1938E	Duplicates	2200	x1050
1938D	Bánh Bò	3300	x92
1938C	Bit Counting Sequence	1900	x1527
1938B	Attraction Score	3000	x201
1938A	Antiparticle Antiphysics	3500	x58
1936F	Grand Finale: Circles binary search, geometry	3300	x148
1936E	Yet Yet Another Permutation Problem divide and conquer, fft, math	3400	x126
1936D	Bitwise Paradox binary search, bitmasks, data structures, greedy, two pointers	3100	x537
1936C	Pokémon Arena data structures, graphs, greedy, implementation, shortest paths, sortings	2400	x1383
1936B	Pinball binary search, data structures, implementation, math, two pointers	2000	x3063
1936A	Bitwise Operation Wizard bitmasks, constructive algorithms, greedy, interactive, math	1700	x7726
1935F	Andrey's Tree binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees	2800	x463
1935E	Distance Learning Courses in MAC bitmasks, brute force, data structures, greedy, math	2400	x1432
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x8543
1935C	Messenger in MAC binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings	1800	x8476
1934E	Weird LCM Operations brute force, constructive algorithms, number theory	3000	x251
1934D2	XOR Break --- Game Version bitmasks, games, greedy, interactive	2400	x1434
1934D1	XOR Break --- Solo Version bitmasks, constructive algorithms, greedy	2100	x3626
1934C	Find a Mine binary search, constructive algorithms, geometry, greedy, interactive, math	1700	x7115
1933G	Turtle Magic: Royal Turtle Shell Pattern bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math	2300	x1007
1933F	Turtle Mission: Robot and the Earthquake dfs and similar, dp, graphs, shortest paths	2100	x2575
1933E	Turtle vs. Rabbit Race: Optimal Trainings binary search, implementation, math, ternary search	1500	x11748
1932G	Moving Platforms graphs, math, number theory, shortest paths	2300	x1124
1932F	Feed Cats data structures, dp, sortings	1900	x4344
1932E	Final Countdown implementation, math, number theory	1600	x8614
1932D	Card Game greedy, implementation	1400	x11884
1932C	LR-remainders brute force, data structures, implementation, math, two pointers	1400	x16359
1931G	One-Dimensional Puzzle combinatorics, math, number theory	2000	x2953
1931F	Chat Screenshots combinatorics, dfs and similar, graphs	1700	x8416
1931E	Anna and the Valentine's Day Gift games, greedy, math, sortings	1400	x16993
1930I	Counting Is Fun combinatorics	3500	x75
1930H	Interactive Mex Tree constructive algorithms, dfs and similar, interactive, trees	3300	x208
1930G	Prefix Max Set Counting data structures, dp, trees	3100	x364
1930F	Maximize the Difference bitmasks, brute force, dfs and similar	2700	x745
1930E	2..3...4.... Wonderful! Wonderful! combinatorics, dp, math	2400	x1199
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x2733
1930D1	Sum over all Substrings (Easy Version) brute force, dp, greedy, strings	1800	x4279
1930C	Lexicographically Largest binary search, constructive algorithms, data structures, greedy, sortings	1700	x7334
1929F	Sasha and the Wedding Binary Search Tree brute force, combinatorics, data structures, dfs and similar, math, trees	2300	x1843
1929E	Sasha and the Happy Tree Cutting bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees	2300	x1756
1929D	Sasha and a Walk in the City combinatorics, dp, math, trees	1900	x4972
1929C	Sasha and the Casino binary search, brute force, constructive algorithms, games, greedy, math	1400	x15466
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x275
1928E	Modular Sequence brute force, constructive algorithms, dp, graphs, greedy, math, number theory	2300	x1780
1928D	Lonely Mountain Dungeons brute force, data structures, greedy, math, ternary search	1900	x4456
1928C	Physical Education Lesson brute force, math, number theory	1600	x8925
1927G	Paint Charges data structures, dp, greedy, math	2300	x1745
1927F	Microcycle data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees	1900	x4581
1927E	Klever Permutation constructive algorithms, math, two pointers	1400	x14605
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x3769
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x1782
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x12634
1925D	Good Trip combinatorics, dp, math, probabilities	1900	x3784
1924F	Anti-Proxy Attendance constructive algorithms, dp, interactive, ternary search	3500	x158
1924E	Paper Cutting Again combinatorics, probabilities	3100	x445
1924D	Balanced Subsequences combinatorics, dp, math	2700	x1069
1924C	Fractal Origami geometry, math, matrices	2400	x1191
1924B	Space Harbour data structures, implementation, math, sortings	2100	x2663
1924A	Did We Get Everything Covered? constructive algorithms, dp, greedy, shortest paths, strings	1500	x14492
1923F	Shrink-Reverse binary search, brute force, greedy, hashing, implementation, string suffix structures, strings	2800	x388
1923E	Count Paths data structures, dfs and similar, dp, dsu, graphs, trees	2000	x4096
1923D	Slimes binary search, constructive algorithms, data structures, greedy, two pointers	1800	x7126
1923C	Find B constructive algorithms, greedy	1400	x15860
1922F	Replace on Segment dp, graph matchings	2500	x1460
1922E	Increasing Subsequences bitmasks, constructive algorithms, divide and conquer, greedy, math	1800	x7970
1922D	Berserk Monsters brute force, data structures, dsu, implementation, math	1900	x5893
1921G	Mischievous Shooter brute force, data structures, divide and conquer, dp, implementation	2200	x1277
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x4040
1921E	Eat the Chip brute force, games, greedy, math	1600	x10143
1920F2	Smooth Sailing (Hard Version) binary search, data structures, dsu, geometry, graphs, trees	3000	x546
1920F1	Smooth Sailing (Easy Version) binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths	2500	x1037
1920E	Counting Binary Strings combinatorics, dp, math	2100	x2812
1920D	Array Repetition binary search, brute force, dsu, implementation, math	1900	x5776
1920C	Partitioning the Array brute force, math, number theory	1600	x14508
1919H	Tree Diameter interactive, trees	2000	x151
1919G	Tree LGM constructive algorithms, divide and conquer, games, trees	3500	x185
1919F2	Wine Factory (Hard Version) data structures, dp, flows, greedy, matrices	2800	x890
1919F1	Wine Factory (Easy Version) data structures, greedy	2300	x2250
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x901
1919D	01 Tree constructive algorithms, data structures, dsu, greedy, sortings, trees	2100	x4011
1919C	Grouping Increases data structures, dp, greedy	1400	x20283
1918G	Permutation of Given constructive algorithms, math	2700	x489
1918F	Caterpillar on a Tree dfs and similar, graphs, greedy, implementation, sortings, trees	2500	x929
1918E	ace5 and Task Order constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings	2200	x1795
1918D	Blocking Elements binary search, data structures, dp, implementation, two pointers	1900	x5006
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x14568
1917F	Construct Tree bitmasks, constructive algorithms, dp, trees	2500	x993
1917E	Construct Matrix constructive algorithms, math	2500	x1425
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x1841
1917C	Watering an Array brute force, greedy, implementation, math	1600	x10875
1916H2	Matrix Rank (Hard Version) combinatorics, dp, math, matrices, string suffix structures	2700	x551
1916H1	Matrix Rank (Easy Version) brute force, combinatorics, dp, math, matrices	2700	x630