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Codeforces Round 950 (Div. 3)
09:54:17
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Difficulty:
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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
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x251
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x382
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x626
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1288
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1853
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3410
1943A
MEX Game 1
games
,
greedy
1300
x15814
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x68
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x381
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x585
1942E
Farm Game
combinatorics
,
games
2300
x1484
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2494
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5619
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9840
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x12638
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16036
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3055
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5321
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8419
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16944
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x30352
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x27024
1941A
Rudolf and the Ticket
brute force
,
math
800
x39568
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x125
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x33
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x177
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x81
1939D
Big Persimmon
*special problem
,
dp
,
games
x84
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x278
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x210
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x20
1938M
Zig-zag
3500
x46
1938L
XOR Operations
2800
x255
1938K
Tree Quiz
2400
x540
1938J
There and Back Again
2100
x1128
1938I
Symmetric Boundary
2800
x55
1938H
Pho Restaurant
1600
x1901
1938G
Personality Test
2300
x886
1938F
Forming Groups
2400
x665
1938E
Duplicates
2200
x872
1938D
Bánh Bò
3300
x79
1938C
Bit Counting Sequence
1900
x1282
1938B
Attraction Score
3000
x150
1938A
Antiparticle Antiphysics
3500
x38
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13429
1937A
Shuffle Party
implementation
,
math
800
x21796
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x70
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x98
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x429
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1130
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2508
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6696
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x404
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
x7470
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7309
1935B
Informatics in MAC
constructive algorithms
1200
x16837
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25931
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x187
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1220
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3140
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6153
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x17059
1934A
Too Min Too Max
greedy
,
math
800
x23787
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x894
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2246
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9968
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x18217
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20917
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30407
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35973
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x903
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3498
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7065
1932D
Card Game
greedy
,
implementation
1400
x10186
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14068
1932B
Chaya Calendar
number theory
1100
x18828
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x27279
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2493
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x7103
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13696
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x16306
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x26613
1931B
Make Equal
greedy
800
x30413
1931A
Recovering a Small String
brute force
,
strings
800
x34006
1930I
Counting Is Fun
combinatorics
3500
x55
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x129
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x258
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x621
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1016
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2401
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3750
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6507
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13905
1930A
Maximise The Score
greedy
,
sortings
800
x17407
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1662
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1542
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4254
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13529
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24058
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