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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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Custom test
Problems
#
Name
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
trees
x274
1948F
Rare Coins
combinatorics
,
math
,
probabilities
x619
1948E
Clique Partition
constructive algorithms
,
graphs
,
greedy
,
implementation
x1809
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
x5882
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
x11053
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
x16103
1948A
Special Characters
brute force
,
constructive algorithms
x21164
1945H
GCD is Greater
bitmasks
,
brute force
,
number theory
x57
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
x91
1945F
Kirill and Mushrooms
data structures
,
sortings
x870
1945E
Binary Search
binary search
,
constructive algorithms
x2155
1945D
Seraphim the Owl
greedy
x5471
1945C
Left and Right Houses
brute force
x6254
1945B
Fireworks
math
,
number theory
x10274
1945A
Setting up Camp
math
x12905
1944B
Equal XOR
bitmasks
,
constructive algorithms
x11366
1944A
Destroying Bridges
math
x16919
1943F
Minimum Hamming Distance
dp
x19
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
x76
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
x157
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
x261
1943D1
Counting Is Fun (Easy Version)
combinatorics
,
dp
,
math
x733
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
x1112
1943B
Non-Palindromic Substring
data structures
,
hashing
,
implementation
,
math
,
strings
x2154
1943A
MEX Game 1
games
,
greedy
x11691
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2250
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x4220
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x6702
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x14629
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x26305
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x23176
1941A
Rudolf and the Ticket
brute force
,
math
800
x35017
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x95
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
x240
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x185
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
x463
1938J
There and Back Again
2100
x952
1938I
Symmetric Boundary
2800
x40
1938H
Pho Restaurant
1600
x1595
1938G
Personality Test
2300
x740
1938F
Forming Groups
2400
x559
1938E
Duplicates
2200
x744
1938D
Bánh Bò
3300
x60
1938C
Bit Counting Sequence
1900
x1050
1938B
Attraction Score
3000
x124
1938A
Antiparticle Antiphysics
3500
x31
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x11636
1937A
Shuffle Party
implementation
,
math
800
x19573
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x43
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x56
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x320
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x867
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2018
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x5867
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x276
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x936
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x6407
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x6169
1935B
Informatics in MAC
constructive algorithms
1200
x14805
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x23447
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x137
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1021
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2713
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5455
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x14988
1934A
Too Min Too Max
greedy
,
math
800
x21408
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x746
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x1915
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x8608
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x16181
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x18952
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x27950
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x33255
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x743
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x2803
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x5872
1932D
Card Game
greedy
,
implementation
1400
x8744
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x12260
1932B
Chaya Calendar
number theory
1100
x16913
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x24748
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2239
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6372
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x12271
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x14643
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x24467
1931B
Make Equal
greedy
800
x28729
1931A
Recovering a Small String
brute force
,
strings
800
x32256
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
x541
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x887
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2199
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Before contest
Codeforces Round 936 (Div. 2)
2 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
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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