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Before contest
Codeforces Round (Div. 2)
7 days
→ 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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Custom test
Problems
#
Name
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1079
1774E
Two Chess Pieces
dfs and similar
,
dp
,
greedy
,
trees
1900
x3483
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7864
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x12011
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x12263
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x22403
1773L
Lisa's Sequences
dp
3500
x43
1773K
King's Puzzle
constructive algorithms
1900
x1414
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x108
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x480
1773H
Hot and Cold
binary search
,
interactive
2600
x359
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x366
1773F
Football
constructive algorithms
800
x4113
1773E
Easy Assembly
greedy
,
sortings
1400
x4876
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x467
1773C
Cactus Meets Torus
3500
x30
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x770
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1537
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1350
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2365
1772E
Permutation Game
games
1700
x6768
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x15907
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x23713
1772B
Matrix Rotation
brute force
,
implementation
800
x29223
1772A
A+B?
implementation
800
x47640
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x1142
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x702
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2764
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x9696
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x14393
1771A
Hossam and Combinatorics
combinatorics
,
math
,
sortings
900
x22907
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x104
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x158
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x668
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1354
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3846
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8535
1770B
Koxia and Permutation
constructive algorithms
1000
x19401
1770A
Koxia and Whiteboards
brute force
,
greedy
1000
x23507
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x119
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x197
1769D1
Игра в Девятку I
*special problem
,
brute force
,
dp
1800
x383
1769C2
Подкрутка II
*special problem
,
dp
1300
x969
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x970
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x877
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1359
1769A
Узкая дорога
*special problem
,
math
800
x1956
1768F
Wonderful Jump
dp
,
greedy
2900
x842
1768E
Partial Sorting
combinatorics
,
math
,
number theory
2300
x1881
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x7154
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x14189
1768B
Quick Sort
greedy
,
math
900
x23093
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x28919
1767F
Two Subtrees
data structures
,
trees
3100
x276
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x928
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9887
1767C
Count Binary Strings
data structures
,
dp
2100
x2649
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x20355
1767A
Cut the Triangle
implementation
800
x20545
1766F
MCF
flows
2800
x268
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1195
1766D
Lucky Chains
math
,
number theory
1600
x8908
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13654
1766B
Notepad#
implementation
1000
x21117
1766A
Extremely Round
brute force
,
implementation
800
x26628
1765N
Number Reduction
greedy
1500
x4774
1765M
Minimum LCM
math
,
number theory
1000
x15535
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x583
1765K
Torus Path
greedy
,
math
1500
x5796
1765J
Hero to Zero
graph matchings
,
math
2900
x197
1765I
Infinite Chess
implementation
,
shortest paths
2800
x188
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1264
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x388
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x600
1765E
Exchange
brute force
,
math
1000
x10063
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4156
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x387
1765B
Broken Keyboard
greedy
800
x9015
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x697
1764H
Doremy's Paint 2
data structures
3400
x191
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x462
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x530
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x589
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x961
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1231
1764D
Doremy's Pegging Game
combinatorics
,
dp
,
math
2000
x2765
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9402
1764B
Doremy's Perfect Math Class
math
,
number theory
900
x15856
1764A
Doremy's Paint
greedy
800
x16592
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x477
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1798
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x2053
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6554
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14615
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15675
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x102
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x651
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x660
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3599
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x9175
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