Problemset - Codeforces

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Codeforces Round (Div. 2)
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Problems

#	Name
1989E	Distance to Different combinatorics, dp, math	2300	x1038
1989D	Smithing Skill brute force, data structures, dp, greedy, math, sortings, two pointers	1900	x3621
1987A	Upload More RAM greedy, math		x17164
1986G2	Permutation Problem (Hard Version) brute force, data structures, hashing, math, number theory	2500	x639
1986G1	Permutation Problem (Simple Version) binary search, brute force, combinatorics, data structures, math, number theory	2200	x955
1986E	Beautiful Array greedy, math, number theory, sortings	1700	x6213
1986D	Mathematical Problem brute force, dp, greedy, implementation, math, two pointers	1400	x11388
1986A	X Axis brute force, geometry, math, sortings	800	x32029
1985G	D-Function combinatorics, math, number theory	1600	x7028
1985E	Secret Box brute force, combinatorics, math	1200	x16364
1985D	Manhattan Circle implementation, math	900	x28784
1985B	Maximum Multiple Sum brute force, math, number theory	800	x37586
1984F	Reconstruction brute force, dp, math	2500	x723
1984D	''a'' String Problem brute force, hashing, implementation, math, string suffix structures, strings	2000	x2654
1984C2	Magnitude (Hard Version) combinatorics, dp, greedy, math	1700	x6044
1984C1	Magnitude (Easy Version) dp, greedy, math	1300	x13405
1984B	Large Addition implementation, math	1100	x15493
1982E	Number of k-good subarrays bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle	2300	x1061
1982D	Beauty of the mountains brute force, data structures, implementation, math, number theory	1700	x5222
1982B	Collatz Conjecture brute force, implementation, math, number theory	1200	x13363
1982A	Soccer greedy, implementation, math, sortings	800	x20655
1981C	Turtle and an Incomplete Sequence bitmasks, brute force, constructive algorithms, greedy, implementation, math	1800	x4214
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x11593
1981A	Turtle and Piggy Are Playing a Game brute force, greedy, math	800	x19671
1980F2	Field Division (hard version) math, sortings	2400	x784
1980F1	Field Division (easy version) data structures, math, sortings	1900	x3104
1980E	Permutation of Rows and Columns constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings	1600	x8656
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x12066
1980A	Problem Generator math	800	x35927
1978D	Elections data structures, greedy, implementation, math	1600	x8682
1978C	Manhattan Permutations constructive algorithms, data structures, greedy, implementation, math	1300	x11914
1978B	New Bakery binary search, greedy, math, ternary search	800	x18871
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x5714
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x15797
1977A	Little Nikita math	800	x27473
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees	2500	x802
1975G	Zimpha Fan Club fft, greedy, math, strings	3000	x193
1975F	Set bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math	2600	x669
1975B	378QAQ and Mocha's Array brute force, greedy, math, sortings	1000	x15504
1974A	Phone Desktop greedy, math	800	x30424
1973E	Cat, Fox and Swaps graphs, math, sortings	2500	x677
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x1679
1973C	Cat, Fox and Double Maximum constructive algorithms, greedy, implementation, math, sortings	1700	x7261
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x12407
1973A	Chess For Three brute force, dp, implementation, math	900	x21783
1971F	Circle Perimeter binary search, brute force, dfs and similar, geometry, implementation, math	1600	x8567
1971E	Find the Car binary search, math, sortings	1500	x12172
1969D	Shop Game data structures, greedy, math, sortings	1900	x3931
1969A	Two Friends constructive algorithms, implementation, math	800	x18372
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1669
1968D	Permutation Game brute force, dfs and similar, games, graphs, greedy, math	1300	x13364
1968A	Maximize? brute force, math, number theory	800	x30672
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x83
1967E1	Again Counting Arrays (Easy Version) combinatorics, dp, fft, math	3100	x164
1967C	Fenwick Tree bitmasks, brute force, combinatorics, data structures, dp, math, trees	2300	x1469
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x3491
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x11712
1967A	Permutation Counting binary search, greedy, implementation, math, sortings	1400	x10918
1965A	Everything Nim games, greedy, math, sortings	1400	x11936
1958B	Clock in the Pool *special problem, math	1400	x727
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1106
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x4028
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x8578
1956E2	Nene vs. Monsters (Hard Version) brute force, greedy, implementation, math	2700	x744
1956E1	Nene vs. Monsters (Easy Version) brute force, implementation, math	2500	x1330
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3518
1956C	Nene's Magical Matrix constructive algorithms, greedy, math	1600	x11747
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3930
1955F	Unfair Game dp, games, greedy, math, schedules	1800	x6394
1955C	Inhabitant of the Deep Sea greedy, implementation, math	1300	x19374
1955A	Yogurt Sale math	800	x39514
1954F	Unique Strings combinatorics, dp, math	3100	x231
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1983
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x5423
1954C	Long Multiplication greedy, math, number theory	1200	x17572
1954B	Make It Ugly implementation, math	1200	x16989
1954A	Painting the Ribbon constructive algorithms, greedy, math	900	x22142
1952G	Mathematician Takeover binary search, dfs and similar, math		x974
1952E	Sweep Line combinatorics, games, math		x221
1951G	Clacking Balls combinatorics, math, probabilities	3100	x286
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x3273
1951D	Buying Jewels constructive algorithms, greedy, math	2000	x5045
1951C	Ticket Hoarding greedy, math, sortings	1400	x10593
1951A	Dual Trigger constructive algorithms, greedy, math	900	x18126
1950C	Clock Conversion implementation, math	800	x37038
1949K	Make Triangle constructive algorithms, math	2800	x263
1949H	Division Avoidance greedy, math	3100	x78
1949E	Damage per Second brute force, math	2900	x89
1948F	Rare Coins combinatorics, math, probabilities	2500	x1199
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2230
1946B	Maximum Sum dp, greedy, math	1100	x19012
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x555
1945B	Fireworks math, number theory	900	x21021
1945A	Setting up Camp greedy, math	800	x26111
1944A	Destroying Bridges graphs, greedy, math	800	x22316
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1332
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x3520
1942G	Bessie and Cards combinatorics, dp, math	2800	x405
1942F	Farmer John's Favorite Function brute force, data structures, implementation, math	2700	x616
1942C2	Bessie's Birthday Cake (Hard Version) geometry, greedy, math	1700	x5777

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