Problemset - Codeforces

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Educational Codeforces Round 173 (Rated for Div. 2)
35:20:31
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Problems

#	Name
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x219
1967D	Long Way to be Non-decreasing binary search, dfs and similar, graphs, implementation, shortest paths, two pointers	2800	x685
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1802
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x3999
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x13549
1967A	Permutation Counting binary search, greedy, implementation, math, sortings	1400	x12726
1966B	Rectangle Filling constructive algorithms, implementation	1100	x15223
1966A	Card Exchange constructive algorithms, games, greedy	800	x18075
1965F	Conference data structures, flows	3300	x193
1965E	Connected Cubes constructive algorithms, games	3100	x312
1965D	Missing Subarray Sum constructive algorithms	2900	x436
1965C	Folding Strip constructive algorithms, greedy, strings	2300	x1985
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x6877
1965A	Everything Nim games, greedy, math, sortings	1400	x14014
1958J	Necromancer *special problem	3200	x34
1958I	Equal Trees *special problem, graphs, meet-in-the-middle	3100	x36
1958H	Composite Spells *special problem, dp	2600	x81
1958G	Observation Towers *special problem	2400	x113
1958F	Narrow Paths *special problem, combinatorics	2000	x207
1958E	Yet Another Permutation Constructive *special problem, constructive algorithms	1900	x275
1958D	Staircase *special problem	1600	x544
1958C	Firewood *special problem	1500	x754
1958B	Clock in the Pool *special problem, math	1400	x922
1958A	1-3-5 *special problem, dp	1100	x2035
1957F2	Frequency Mismatch (Hard Version) binary search, data structures, dfs and similar, hashing, probabilities, trees	2700	x449
1957F1	Frequency Mismatch (Easy Version) binary search, data structures, divide and conquer, hashing, probabilities, trees	2600	x508
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1306
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x4601
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x9893
1957B	A BIT of a Construction bitmasks, constructive algorithms, greedy, implementation	1100	x18170
1957A	Stickogon constructive algorithms, greedy	800	x23583
1956F	Nene and the Passing Game constructive algorithms, data structures, dsu, graphs, sortings	3000	x368
1956E2	Nene vs. Monsters (Hard Version) brute force, greedy, implementation, math	2700	x901
1956E1	Nene vs. Monsters (Easy Version) brute force, implementation, math	2500	x1482
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x4004
1956C	Nene's Magical Matrix constructive algorithms, greedy, math	1600	x13147
1956B	Nene and the Card Game games, greedy	800	x21458
1956A	Nene's Game binary search, brute force, data structures, games, greedy	800	x21970
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x1279
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x4660
1955F	Unfair Game dp, games, greedy, math, schedules	1800	x7260
1955E	Long Inversions brute force, greedy, implementation, sortings	1700	x8812
1955D	Inaccurate Subsequence Search data structures, two pointers	1400	x15727
1955C	Inhabitant of the Deep Sea greedy, implementation, math	1300	x21627
1955B	Progressive Square constructive algorithms, data structures, implementation, sortings	1000	x28416
1955A	Yogurt Sale math	800	x44395
1954F	Unique Strings combinatorics, dp, math	3100	x258
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x2365
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x6350
1954C	Long Multiplication greedy, math, number theory	1200	x19816
1954B	Make It Ugly implementation, math	1200	x18888
1954A	Painting the Ribbon constructive algorithms, greedy, math	900	x24510
1953A	Accuracy-Preserving Summation Algorithm *special problem
1952J	Help, what does it mean to be "Based" brute force, constructive algorithms, expression parsing, implementation, sortings		x780
1952I	Dark Matter bitmasks, geometry		x543
1952H	Palindrome implementation, strings		x708
1952G	Mathematician Takeover binary search, dfs and similar, math		x1041
1952F	Grid brute force		x1765
1952E	Sweep Line *special problem, combinatorics, games, math		x259
1952D	Are You a Procrastinator? implementation		x4664
1952C	They Have Fooled brute force, schedules		x2930
1952B	Is it stated? *special problem, strings		x11229
1952A	Are You a Robot, Again? strings		x12617
1951I	Growing Trees binary search, constructive algorithms, flows, graphs, greedy	3200	x76
1951H	Thanos Snap binary search, dp, games, greedy, trees	3200	x286
1951G	Clacking Balls combinatorics, math, probabilities	3100	x341
1951F	Inversion Composition constructive algorithms, data structures, greedy	2500	x773
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x3706
1951D	Buying Jewels constructive algorithms, greedy, math	2000	x5515
1951C	Ticket Hoarding greedy, math, sortings	1400	x11931
1951B	Battle Cows binary search, data structures, greedy	1200	x14939
1951A	Dual Trigger constructive algorithms, greedy, math	900	x20127
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x4542
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x9407
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x14844
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x23687
1950C	Clock Conversion implementation, math	800	x40859
1950B	Upscaling implementation	800	x39044
1950A	Stair, Peak, or Neither? implementation	800	x55001
1949K	Make Triangle constructive algorithms, math	2800	x333
1949J	Amanda the Amoeba graphs, implementation, trees, two pointers	2600	x411
1949I	Disks dfs and similar, geometry, graph matchings, graphs	1800	x1935
1949H	Division Avoidance greedy, math	3100	x127
1949G	Scooter graphs, greedy	2300	x806
1949F	Dating greedy, sortings, trees	2200	x1034
1949E	Damage per Second brute force, math	2900	x106
1949D	Funny or Scary? constructive algorithms	2600	x423
1949C	Annual Ants' Gathering dfs and similar, dp, greedy, trees	1900	x1836
1949B	Charming Meals binary search, brute force, greedy, sortings	1500	x3486
1949A	Grove brute force, dfs and similar, dp, geometry, probabilities	3300	x116
1948G	MST with Matching bitmasks, brute force, dsu, graph matchings, trees	3100	x709
1948F	Rare Coins combinatorics, math, probabilities	2500	x1353
1948E	Clique Partition brute force, constructive algorithms, graphs, greedy, implementation	2100	x3051
1948D	Tandem Repeats? brute force, strings, two pointers	1700	x9644
1948C	Arrow Path brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths	1300	x17305
1948B	Array Fix brute force, dp, greedy, implementation	1100	x23309
1948A	Special Characters brute force, constructive algorithms	800	x29046
1946F	Nobody is needed 2-sat, data structures, dfs and similar, dp	2500	x1005
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2610
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x4819