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Codeforces Round 950 (Div. 3)
40:09:29
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Difficulty:
—
math
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1981C
Turtle and an Incomplete Sequence
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
x2587
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
x8105
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
x14629
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x4601
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x13700
1977A
Little Nikita
math
800
x23075
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
x510
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x137
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x516
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x13194
1974A
Phone Desktop
greedy
,
math
800
x27858
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x596
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1532
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x6558
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11357
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x20024
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x7617
1971E
Find the Car
binary search
,
math
,
sortings
1500
x10770
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3647
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x17266
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1499
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x12471
1968A
Maximize?
brute force
,
math
,
number theory
800
x28956
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x68
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x142
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1394
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3298
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10789
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10104
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x11115
1958B
Clock in the Pool
*special problem
,
math
1400
x672
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1052
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3837
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x8102
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x711
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1279
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3380
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x11178
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3703
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x6139
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x18586
1955A
Yogurt Sale
math
800
x38004
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x215
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1880
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x5171
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x16642
1954B
Make It Ugly
implementation
,
math
1200
x16250
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x21307
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x950
1952E
Sweep Line
combinatorics
,
games
,
math
x214
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x269
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3124
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x4831
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x9981
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x17063
1950C
Clock Conversion
implementation
,
math
800
x35878
1949K
Make Triangle
constructive algorithms
,
math
2800
x255
1949H
Division Avoidance
greedy
,
math
3100
x78
1949E
Damage per Second
brute force
,
math
2900
x89
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1173
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2164
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x18415
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x510
1945B
Fireworks
math
,
number theory
900
x20245
1945A
Setting up Camp
greedy
,
math
800
x25298
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x21701
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1287
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3407
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x381
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x585
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5617
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9828
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12624
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16027
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26978
1941A
Rudolf and the Ticket
brute force
,
math
800
x39526
1937A
Shuffle Party
implementation
,
math
800
x21780
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x98
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2506
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6690
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1195
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7464
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6146
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x17044
1934A
Too Min Too Max
greedy
,
math
800
x23771
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x894
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9945
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x18190
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20880
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30360
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35926
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x903
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7046
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14040
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2492
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13679
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x16277
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x26565
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1013
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13887
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