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Educational Codeforces Round 163 (Rated for Div. 2)
09:20:38
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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
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x1828
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x3642
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x5926
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x13471
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x24464
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x21312
1941A
Rudolf and the Ticket
brute force
,
math
800
x32706
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x92
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x18
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x133
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x61
1939D
Big Persimmon
*special problem
,
dp
,
games
x44
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x232
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x182
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x10
1938M
Zig-zag
3500
x36
1938L
XOR Operations
2800
x191
1938K
Tree Quiz
2400
x440
1938J
There and Back Again
2100
x905
1938I
Symmetric Boundary
2800
x39
1938H
Pho Restaurant
1600
x1520
1938G
Personality Test
2300
x698
1938F
Forming Groups
2400
x525
1938E
Duplicates
2200
x711
1938D
Bánh Bò
3300
x55
1938C
Bit Counting Sequence
1900
x1002
1938B
Attraction Score
3000
x119
1938A
Antiparticle Antiphysics
3500
x28
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x11264
1937A
Shuffle Party
implementation
,
math
800
x19018
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x40
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x53
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x282
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x815
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x1914
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x5709
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x261
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x876
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x6151
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x5943
1935B
Informatics in MAC
constructive algorithms
1200
x14411
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x22820
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x128
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x989
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2637
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5338
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x14569
1934A
Too Min Too Max
greedy
,
math
800
x20863
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x728
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x1859
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x8398
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x15843
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x18601
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x27433
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x32747
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x717
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x2706
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x5699
1932D
Card Game
greedy
,
implementation
1400
x8533
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x11993
1932B
Chaya Calendar
number theory
1100
x16590
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x24393
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2201
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6282
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x12130
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x14469
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x24202
1931B
Make Equal
greedy
800
x28460
1931A
Recovering a Small String
brute force
,
strings
800
x32053
1930I
Counting Is Fun
combinatorics
3500
x28
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x89
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x175
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x516
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x875
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2150
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3338
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x5872
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x12221
1930A
Maximise The Score
greedy
,
sortings
800
x15691
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1485
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1345
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x3784
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x12305
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x22711
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x27415
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x184
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1374
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3427
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x6787
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x14038
1928A
Rectangle Cutting
geometry
,
math
800
x20061
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1367
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3425
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x11559
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x16943
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x24233
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x28833
1927A
Make it White
greedy
,
strings
800
x37898
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2509
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1254
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