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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
20:24:17
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combine-tags-by-or
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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
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Status
Standings
Custom test
Problems
#
Name
1938H
Pho Restaurant
1600
x2178
1938G
Personality Test
2300
x1066
1938F
Forming Groups
2400
x766
1938E
Duplicates
2200
x1021
1938D
Bánh Bò
3300
x91
1938C
Bit Counting Sequence
1900
x1486
1938B
Attraction Score
3000
x201
1938A
Antiparticle Antiphysics
3500
x56
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x15157
1937A
Shuffle Party
implementation
,
math
800
x23253
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x145
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
x519
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1342
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2966
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7526
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x454
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1382
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x8321
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8267
1935B
Informatics in MAC
constructive algorithms
1200
x18692
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x28069
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x241
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1403
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3557
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6866
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x19111
1934A
Too Min Too Max
greedy
,
math
800
x25544
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x987
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2516
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x11346
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x20460
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22775
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x33079
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x38373
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x1095
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x4205
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x8322
1932D
Card Game
greedy
,
implementation
1400
x11584
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x15930
1932B
Chaya Calendar
number theory
1100
x20972
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x29912
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2879
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x8173
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x16191
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x19291
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x29410
1931B
Make Equal
greedy
800
x32415
1931A
Recovering a Small String
brute force
,
strings
800
x36457
1930I
Counting Is Fun
combinatorics
3500
x74
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x181
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x345
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x724
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1155
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2660
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x4166
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x7176
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x15445
1930A
Maximise The Score
greedy
,
sortings
800
x18708
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1821
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1722
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4858
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x15097
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x25427
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x31757
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x244
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1743
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x4330
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8685
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17722
1928A
Rectangle Cutting
geometry
,
math
800
x22817
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1707
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4459
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x14203
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x21890
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x28214
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x33527
1927A
Make it White
greedy
,
strings
800
x43954
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3651
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1732
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x12090
1926D
Vlad and Division
bitmasks
,
greedy
1300
x15731
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x27030
1926B
Vlad and Shapes
geometry
,
implementation
800
x32770
1926A
Vlad and the Best of Five
implementation
800
x49052
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3700
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x20280
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x29013
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x156
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x441
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x1028
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1179
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2610
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x14122
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x378
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3951
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6902
1923C
Find B
constructive algorithms
,
greedy
1400
x15325
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x17838
1923A
Moving Chips
greedy
,
implementation
800
x24818
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