Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round (Div. 2)
7 days

→ Filter Problems

Difficulty: —

math

Add tag

Problems

#	Name
1989E	Distance to Different combinatorics, dp, math	2300	x931
1989D	Smithing Skill brute force, data structures, dp, greedy, math, sortings, two pointers	1900	x3324
1987A	Upload More RAM greedy, math		x14630
1986G2	Permutation Problem (Hard Version) brute force, data structures, hashing, math, number theory	2500	x600
1986G1	Permutation Problem (Simple Version) binary search, brute force, combinatorics, data structures, math, number theory	2200	x906
1986E	Beautiful Array greedy, math, number theory, sortings	1700	x6010
1986D	Mathematical Problem brute force, dp, greedy, implementation, math, two pointers	1400	x11057
1986A	X Axis brute force, geometry, math, sortings	800	x31326
1985G	D-Function combinatorics, math, number theory	1600	x6912
1985E	Secret Box brute force, combinatorics, math	1200	x16177
1985D	Manhattan Circle implementation, math	900	x28537
1985B	Maximum Multiple Sum brute force, math, number theory	800	x37249
1984F	Reconstruction brute force, dp, math	2500	x714
1984D	''a'' String Problem brute force, hashing, implementation, math, string suffix structures, strings	2000	x2629
1984C2	Magnitude (Hard Version) combinatorics, dp, greedy, math	1700	x5993
1984C1	Magnitude (Easy Version) dp, greedy, math	1300	x13272
1984B	Large Addition implementation, math	1100	x15351
1982E	Number of k-good subarrays bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle	2300	x1004
1982D	Beauty of the mountains brute force, data structures, implementation, math, number theory	1700	x5034
1982B	Collatz Conjecture brute force, implementation, math, number theory	1200	x12995
1982A	Soccer greedy, implementation, math, sortings	800	x20203
1981C	Turtle and an Incomplete Sequence bitmasks, brute force, constructive algorithms, greedy, implementation, math	1800	x4182
1981B	Turtle and an Infinite Sequence bitmasks, math	1300	x11495
1981A	Turtle and Piggy Are Playing a Game brute force, greedy, math	800	x19559
1980F2	Field Division (hard version) math, sortings	2400	x773
1980F1	Field Division (easy version) data structures, math, sortings	1900	x3074
1980E	Permutation of Rows and Columns constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings	1600	x8597
1980D	GCD-sequence greedy, implementation, math, number theory	1400	x11978
1980A	Problem Generator math	800	x35796
1978D	Elections data structures, greedy, implementation, math	1600	x8559
1978C	Manhattan Permutations constructive algorithms, data structures, greedy, implementation, math	1300	x11766
1978B	New Bakery binary search, greedy, math, ternary search	800	x18660
1977C	Nikita and LCM brute force, data structures, dp, greedy, math, number theory, sortings	1900	x5679
1977B	Binary Colouring bitmasks, constructive algorithms, greedy, math	1100	x15718
1977A	Little Nikita math	800	x27339
1976E	Splittable Permutations combinatorics, data structures, dfs and similar, greedy, math, trees	2500	x792
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	x662
1975B	378QAQ and Mocha's Array brute force, greedy, math, sortings	1000	x15417
1974A	Phone Desktop greedy, math	800	x30340
1973E	Cat, Fox and Swaps graphs, math, sortings	2500	x676
1973D	Cat, Fox and Maximum Array Split brute force, interactive, math	2400	x1674
1973C	Cat, Fox and Double Maximum constructive algorithms, greedy, implementation, math, sortings	1700	x7227
1973B	Cat, Fox and the Lonely Array binary search, bitmasks, data structures, greedy, math, two pointers	1300	x12369
1973A	Chess For Three brute force, dp, implementation, math	900	x21708
1971F	Circle Perimeter binary search, brute force, dfs and similar, geometry, implementation, math	1600	x8525
1971E	Find the Car binary search, math, sortings	1500	x12113
1969D	Shop Game data structures, greedy, math, sortings	1900	x3916
1969A	Two Friends constructive algorithms, implementation, math	800	x18314
1968G2	Division + LCP (hard version) binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings	2200	x1655
1968D	Permutation Game brute force, dfs and similar, games, graphs, greedy, math	1300	x13332
1968A	Maximize? brute force, math, number theory	800	x30612
1967E2	Again Counting Arrays (Hard Version) combinatorics, dp, math	3500	x82
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	x1465
1967B2	Reverse Card (Hard Version) brute force, math, number theory	2200	x3482
1967B1	Reverse Card (Easy Version) brute force, math, number theory	1400	x11671
1967A	Permutation Counting binary search, greedy, implementation, math, sortings	1400	x10880
1965A	Everything Nim games, greedy, math, sortings	1400	x11889
1958B	Clock in the Pool *special problem, math	1400	x724
1957E	Carousel of Combinations brute force, combinatorics, dp, math, number theory	2400	x1103
1957D	A BIT of an Inequality bitmasks, brute force, dp, math	1900	x4019
1957C	How Does the Rook Move? combinatorics, dp, math	1600	x8550
1956E2	Nene vs. Monsters (Hard Version) brute force, greedy, implementation, math	2700	x740
1956E1	Nene vs. Monsters (Easy Version) brute force, implementation, math	2500	x1327
1956D	Nene and the Mex Operator bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math	2000	x3513
1956C	Nene's Magical Matrix constructive algorithms, greedy, math	1600	x11718
1955G	GCD on a grid brute force, dfs and similar, dp, implementation, math, number theory	1900	x3911
1955F	Unfair Game dp, games, greedy, math, schedules	1800	x6380
1955C	Inhabitant of the Deep Sea greedy, implementation, math	1300	x19343
1955A	Yogurt Sale math	800	x39433
1954F	Unique Strings combinatorics, dp, math	3100	x230
1954E	Chain Reaction binary search, data structures, dsu, greedy, implementation, math, number theory	2200	x1974
1954D	Colored Balls combinatorics, dp, math, sortings	1800	x5408
1954C	Long Multiplication greedy, math, number theory	1200	x17532
1954B	Make It Ugly implementation, math	1200	x16946
1954A	Painting the Ribbon constructive algorithms, greedy, math	900	x22084
1952G	Mathematician Takeover binary search, dfs and similar, math		x973
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	x3266
1951D	Buying Jewels constructive algorithms, greedy, math	2000	x5037
1951C	Ticket Hoarding greedy, math, sortings	1400	x10571
1951A	Dual Trigger constructive algorithms, greedy, math	900	x18082
1950C	Clock Conversion implementation, math	800	x36986
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	x1196
1946E	Girl Permutation combinatorics, dp, math, number theory	2200	x2227
1946B	Maximum Sum dp, greedy, math	1100	x18980
1945H	GCD is Greater brute force, data structures, math, number theory	2600	x554
1945B	Fireworks math, number theory	900	x20980
1945A	Setting up Camp greedy, math	800	x26068
1944A	Destroying Bridges graphs, greedy, math	800	x22287
1943D1	Counting Is Fun (Easy Version) brute force, combinatorics, dp, math	2400	x1330
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x3515
1942G	Bessie and Cards combinatorics, dp, math	2800	x404
1942F	Farmer John's Favorite Function brute force, data structures, implementation, math	2700	x615
1942C2	Bessie's Birthday Cake (Hard Version) geometry, greedy, math	1700	x5770

←