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When submitting a solution in C++, please select either C++14 (GCC 6-32) or C++17 (GCC 7-32) as your compiler.
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Before contest
Codeforces Round 935 (Div. 3)
03:41:22
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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
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
trees
x261
1948F
Rare Coins
combinatorics
,
math
,
probabilities
x603
1948E
Clique Partition
constructive algorithms
,
graphs
,
greedy
,
implementation
x1786
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
x5805
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
x10984
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
x16015
1948A
Special Characters
brute force
,
constructive algorithms
x21080
1944B
Equal XOR
bitmasks
,
constructive algorithms
x11229
1944A
Destroying Bridges
math
x16745
1943F
Minimum Hamming Distance
dp
x17
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
x66
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
x149
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
x250
1943D1
Counting Is Fun (Easy Version)
combinatorics
,
dp
,
math
x710
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
x1085
1943B
Non-Palindromic Substring
data structures
,
hashing
,
implementation
,
math
,
strings
x2100
1943A
MEX Game 1
games
,
greedy
x11519
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2222
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x4194
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x6661
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x14554
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x26188
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x23067
1941A
Rudolf and the Ticket
brute force
,
math
800
x34877
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x94
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x20
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x140
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x63
1939D
Big Persimmon
*special problem
,
dp
,
games
x46
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x238
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x184
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x11
1938M
Zig-zag
3500
x39
1938L
XOR Operations
2800
x209
1938K
Tree Quiz
2400
x461
1938J
There and Back Again
2100
x950
1938I
Symmetric Boundary
2800
x40
1938H
Pho Restaurant
1600
x1592
1938G
Personality Test
2300
x737
1938F
Forming Groups
2400
x558
1938E
Duplicates
2200
x741
1938D
Bánh Bò
3300
x60
1938C
Bit Counting Sequence
1900
x1049
1938B
Attraction Score
3000
x124
1938A
Antiparticle Antiphysics
3500
x31
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x11616
1937A
Shuffle Party
implementation
,
math
800
x19531
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x43
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x54
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x319
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x862
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2010
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x5853
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x275
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x930
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x6393
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x6156
1935B
Informatics in MAC
constructive algorithms
1200
x14785
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x23418
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x134
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1018
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2707
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5448
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x14964
1934A
Too Min Too Max
greedy
,
math
800
x21380
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x745
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x1910
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x8593
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x16153
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x18929
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x27924
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x33228
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x742
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x2789
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x5854
1932D
Card Game
greedy
,
implementation
1400
x8731
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x12243
1932B
Chaya Calendar
number theory
1100
x16889
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x24720
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2236
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6366
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x12257
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x14636
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x24447
1931B
Make Equal
greedy
800
x28719
1931A
Recovering a Small String
brute force
,
strings
800
x32245
1930I
Counting Is Fun
combinatorics
3500
x29
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x89
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x180
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x539
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x885
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2192
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3390
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x5941
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x12439
1930A
Maximise The Score
greedy
,
sortings
800
x15962
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1499
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1359
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x3815
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x12397
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