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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
34:43:26
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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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Custom test
Problems
#
Name
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x11217
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x20751
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x26345
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x695
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x756
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4323
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x8396
1945D
Seraphim the Owl
dp
,
greedy
1300
x14846
1945C
Left and Right Houses
brute force
1200
x15253
1945B
Fireworks
math
,
number theory
900
x23120
1945A
Setting up Camp
greedy
,
math
800
x28074
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x16453
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x24207
1943F
Minimum Hamming Distance
dp
3500
x115
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x309
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x446
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x829
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1538
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2172
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3936
1943A
MEX Game 1
games
,
greedy
1300
x18378
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x99
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x461
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x712
1942E
Farm Game
combinatorics
,
games
2300
x1714
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2856
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x6255
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x11176
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x14202
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x17466
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3652
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x6209
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9978
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x18764
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x34165
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x30553
1941A
Rudolf and the Ticket
brute force
,
math
800
x43159
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x144
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x35
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x209
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x84
1939D
Big Persimmon
*special problem
,
dp
,
games
x101
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x320
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x248
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x24
1938M
Zig-zag
3500
x63
1938L
XOR Operations
2800
x296
1938K
Tree Quiz
2400
x644
1938J
There and Back Again
2100
x1323
1938I
Symmetric Boundary
2800
x77
1938H
Pho Restaurant
1600
x2215
1938G
Personality Test
2300
x1079
1938F
Forming Groups
2400
x779
1938E
Duplicates
2200
x1035
1938D
Bánh Bò
3300
x92
1938C
Bit Counting Sequence
1900
x1507
1938B
Attraction Score
3000
x201
1938A
Antiparticle Antiphysics
3500
x57
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x15333
1937A
Shuffle Party
implementation
,
math
800
x23393
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x147
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x125
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x531
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1363
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x3024
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7615
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x457
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1409
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x8426
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8371
1935B
Informatics in MAC
constructive algorithms
1200
x18944
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x28396
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x243
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1417
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3597
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6975
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x19350
1934A
Too Min Too Max
greedy
,
math
800
x25732
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x995
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2548
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x11562
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x20715
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x23015
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x33351
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x38696
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x1113
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x4284
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x8464
1932D
Card Game
greedy
,
implementation
1400
x11721
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x16132
1932B
Chaya Calendar
number theory
1100
x21174
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x30236
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2921
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x8264
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x16516
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x19733
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x29716
1931B
Make Equal
greedy
800
x32695
1931A
Recovering a Small String
brute force
,
strings
800
x36751
1930I
Counting Is Fun
combinatorics
3500
x75
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