Problemset - Codeforces

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Codeforces Round (Div. 3)
7 days

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Problems

#	Name
1970C2	Game on Tree (Medium) dfs and similar, dp, games, trees	1700	x1747
1970C1	Game on Tree (Easy) games	1400	x2258
1970B3	Exact Neighbours (Hard) constructive algorithms	2300	x359
1970B2	Exact Neighbours (Medium) constructive algorithms	2100	x561
1970B1	Exact Neighbours (Easy) constructive algorithms	1900	x804
1970A3	Balanced Unshuffle (Hard) constructive algorithms, trees	2400	x372
1970A2	Balanced Unshuffle (Medium) brute force, constructive algorithms, trees	2400	x371
1970A1	Balanced Shuffle (Easy) implementation, sortings	1000	x3229
1969F	Card Pairing dp, greedy, hashing, implementation	3000	x166
1969E	Unique Array binary search, data structures, divide and conquer, dp, greedy	2400	x1088
1969D	Shop Game data structures, greedy, math, sortings	1900	x3795
1969C	Minimizing the Sum dp, implementation	1700	x7029
1969B	Shifts and Sorting constructive algorithms, greedy	1000	x16327
1969A	Two Friends constructive algorithms, implementation, math	800	x17879
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1597
1968G1	Division + LCP (easy version) binary search, data structures, dp, hashing, string suffix structures, strings	1900	x3560
1968F	Equal XOR Segments binary search, data structures	1800	x4560
1968E	Cells Arrangement constructive algorithms	1600	x8897
1968D	Permutation Game brute force, dfs and similar, games, graphs, greedy, math	1300	x12985
1968C	Assembly via Remainders constructive algorithms, number theory	1000	x21764
1968B	Prefiquence greedy, two pointers	800	x25236
1968A	Maximize? brute force, math, number theory	800	x29931
1967F	Next and Prev brute force, data structures, implementation	3200	x46
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x77
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x156
1967D	Long Way to be Non-decreasing binary search, dfs and similar, graphs, implementation, shortest paths, two pointers	2800	x517
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1429
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x3416
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x11355
1967A	Permutation Counting binary search, greedy, implementation, math, sortings	1400	x10551
1966B	Rectangle Filling constructive algorithms, implementation	1100	x13095
1966A	Card Exchange constructive algorithms, games, greedy	800	x16075
1965F	Conference data structures, flows	3300	x118
1965E	Connected Cubes constructive algorithms, games	3100	x202
1965D	Missing Subarray Sum constructive algorithms	2900	x307
1965C	Folding Strip constructive algorithms, greedy, strings	2300	x1582
1965B	Missing Subsequence Sum bitmasks, constructive algorithms, greedy, number theory	1800	x5688
1965A	Everything Nim games, greedy, math, sortings	1400	x11551
1958J	Necromancer *special problem	3200	x19
1958I	Equal Trees *special problem, graphs, meet-in-the-middle	3100	x25
1958H	Composite Spells *special problem, dp	2600	x67
1958G	Observation Towers *special problem	2400	x95
1958F	Narrow Paths *special problem, combinatorics	2000	x161
1958E	Yet Another Permutation Constructive *special problem, constructive algorithms	1900	x216
1958D	Staircase *special problem	1600	x394
1958C	Firewood *special problem	1500	x535
1958B	Clock in the Pool *special problem, math	1400	x699
1958A	1-3-5 *special problem, dp	1100	x1228
1957F2	Frequency Mismatch (Hard Version) binary search, data structures, dfs and similar, hashing, probabilities, trees	2700	x320
1957F1	Frequency Mismatch (Easy Version) binary search, data structures, divide and conquer, hashing, probabilities, trees	2600	x380
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1080
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x3936
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x8364
1957B	A BIT of a Construction bitmasks, constructive algorithms, greedy, implementation	1100	x16177
1957A	Stickogon constructive algorithms, greedy	800	x21354
1956F	Nene and the Passing Game constructive algorithms, data structures, dsu, graphs, sortings	3000	x296
1956E2	Nene vs. Monsters (Hard Version) brute force, greedy, implementation, math	2700	x728
1956E1	Nene vs. Monsters (Easy Version) brute force, implementation, math	2500	x1308
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3449
1956C	Nene's Magical Matrix constructive algorithms, greedy, math	1600	x11501
1956B	Nene and the Card Game games, greedy	800	x19853
1956A	Nene's Game binary search, brute force, data structures, games, greedy	800	x20008
1955H	The Most Reckless Defense bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths	2300	x1104
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3823
1955F	Unfair Game dp, games, greedy, math, schedules	1800	x6273
1955E	Long Inversions brute force, greedy, implementation, sortings	1700	x7641
1955D	Inaccurate Subsequence Search data structures, two pointers	1400	x13648
1955C	Inhabitant of the Deep Sea greedy, implementation, math	1300	x18991
1955B	Progressive Square constructive algorithms, data structures, implementation, sortings	1000	x25157
1955A	Yogurt Sale math	800	x38810
1954F	Unique Strings combinatorics, dp, math	3100	x226
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1929
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x5300
1954C	Long Multiplication greedy, math, number theory	1200	x17150
1954B	Make It Ugly implementation, math	1200	x16606
1954A	Painting the Ribbon constructive algorithms, greedy, math	900	x21739
1953A	Accuracy-Preserving Summation Algorithm *special problem
1952J	Help, what does it mean to be "Based" brute force, constructive algorithms, expression parsing, implementation, sortings		x714
1952I	Dark Matter bitmasks, geometry		x391
1952H	Palindrome implementation, strings		x369
1952G	Mathematician Takeover binary search, dfs and similar, math		x961
1952F	Grid brute force		x1677
1952E	Sweep Line combinatorics, games, math		x217
1952D	Are You a Procrastinator? implementation		x4287
1952C	They Have Fooled brute force, schedules		x2770
1952B	Is it stated? strings		x10490
1952A	Are You a Robot, Again? strings		x11609
1951I	Growing Trees binary search, constructive algorithms, flows, graphs, greedy	3200	x69
1951H	Thanos Snap binary search, dp, games, greedy, trees	3200	x226
1951G	Clacking Balls combinatorics, math, probabilities	3100	x284
1951F	Inversion Composition constructive algorithms, data structures, greedy	2500	x688
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x3213
1951D	Buying Jewels constructive algorithms, greedy, math	2000	x4980
1951C	Ticket Hoarding greedy, math, sortings	1400	x10376
1951B	Battle Cows binary search, data structures, greedy	1200	x13036
1951A	Dual Trigger constructive algorithms, greedy, math	900	x17778
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x3768
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x8078
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x12833
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x21298