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Before contest
Codeforces Round 941 (Div. 1)
22:21:04
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Before contest
Codeforces Round 941 (Div. 2)
22:21:04
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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
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2351
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5356
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9257
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x11992
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x15295
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2858
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5080
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x7985
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16307
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29197
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x25967
1941A
Rudolf and the Ticket
brute force
,
math
800
x38379
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x123
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x171
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x78
1939D
Big Persimmon
*special problem
,
dp
,
games
x59
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x272
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x208
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x14
1938M
Zig-zag
3500
x44
1938L
XOR Operations
2800
x244
1938K
Tree Quiz
2400
x524
1938J
There and Back Again
2100
x1094
1938I
Symmetric Boundary
2800
x51
1938H
Pho Restaurant
1600
x1827
1938G
Personality Test
2300
x852
1938F
Forming Groups
2400
x626
1938E
Duplicates
2200
x840
1938D
Bánh Bò
3300
x77
1938C
Bit Counting Sequence
1900
x1230
1938B
Attraction Score
3000
x146
1938A
Antiparticle Antiphysics
3500
x36
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x12869
1937A
Shuffle Party
implementation
,
math
800
x21221
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x64
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x93
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x403
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1053
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2366
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6457
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x381
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1146
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7217
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7028
1935B
Informatics in MAC
constructive algorithms
1200
x16212
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25204
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x171
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1163
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3012
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5953
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16357
1934A
Too Min Too Max
greedy
,
math
800
x23103
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x850
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2161
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9533
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17479
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20204
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29555
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35040
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x859
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3308
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6608
1932D
Card Game
greedy
,
implementation
1400
x9719
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13415
1932B
Chaya Calendar
number theory
1100
x18135
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x26297
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2407
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6849
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13119
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15617
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x25770
1931B
Make Equal
greedy
800
x29753
1931A
Recovering a Small String
brute force
,
strings
800
x33289
1930I
Counting Is Fun
combinatorics
3500
x49
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x118
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x241
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x599
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x974
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2339
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3646
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6321
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13408
1930A
Maximise The Score
greedy
,
sortings
800
x16972
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1604
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1476
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4101
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13073
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23612
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x28665
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x206
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1509
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3696
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7372
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15062
1928A
Rectangle Cutting
geometry
,
math
800
x20990
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1477
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3684
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12233
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18051
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