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Problems
#
Name
1674B
Dictionary
combinatorics
,
math
800
x25560
1674A
Number Transformation
constructive algorithms
,
math
800
x25613
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x766
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x658
1673D
Lost Arithmetic Progression
combinatorics
,
math
,
number theory
1900
x3183
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x11634
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x14226
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x18205
1672I
PermutationForces
data structures
,
greedy
3000
x137
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x912
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x313
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x768
1672F1
Array Shuffling
constructive algorithms
,
graphs
,
greedy
2000
x2959
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2090
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5972
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x12901
1672B
I love AAAB
constructive algorithms
,
implementation
800
x15548
1672A
Log Chopping
games
,
implementation
,
math
800
x15828
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x314
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2639
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x7235
1671C
Dolce Vita
binary search
,
brute force
,
greedy
,
math
1200
x15838
1671B
Consecutive Points Segment
brute force
,
math
,
sortings
1000
x18089
1671A
String Building
implementation
800
x20132
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x915
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1661
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x4940
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9475
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x12401
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x15225
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x16043
1669G
Fall Down
dfs and similar
,
implementation
1200
x17244
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22883
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x16799
1669D
Colorful Stamp
implementation
1100
x20977
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x32708
1669B
Triple
implementation
,
sortings
800
x39579
1669A
Division?
implementation
800
x56612
1668B
Social Distance
greedy
,
math
,
sortings
900
x16302
1668A
Direction Change
implementation
,
math
800
x16141
1667F
Yin Yang
implementation
3500
x91
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x621
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x640
1667C
Half Queen Cover
constructive algorithms
,
math
2400
x1509
1667B
Optimal Partition
data structures
,
dp
2100
x3465
1667A
Make it Increasing
brute force
,
greedy
,
math
1300
x14321
1666L
Labyrinth
dfs and similar
,
graphs
1800
x2974
1666K
Kingdom Partition
flows
3200
x178
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1291
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1381
1666H
Heroes of Might
math
3500
x60
1666G
Global Warming
geometry
,
math
3100
x133
1666F
Fancy Stack
combinatorics
,
dp
,
implementation
2200
x1103
1666E
Even Split
binary search
,
constructive algorithms
,
greedy
,
math
2500
x675
1666D
Deletive Editing
greedy
900
x6755
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x3074
1666B
Budget Distribution
3300
x53
1666A
Admissible Map
3300
x99
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1421
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3676
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8024
1665B
Array Cloning Technique
constructive algorithms
,
greedy
,
sortings
900
x18608
1665A
GCD vs LCM
constructive algorithms
,
math
800
x22900
1663H
Cross-Language Program
*special problem
,
constructive algorithms
x1256
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x203
1663F
In Every Generation...
*special problem
,
strings
x327
1663E
Are You Safe?
*special problem
,
implementation
x537
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1379
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5608
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3345
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10381
1662O
Circular Maze
brute force
,
dfs and similar
,
graphs
,
implementation
x1260
1662N
Drone Photo
combinatorics
,
math
,
sortings
x687
1662M
Bottle Arrangements
constructive algorithms
x3267
1662L
Il Derby della Madonnina
data structures
,
dp
,
math
x988
1662K
Pandemic Restrictions
geometry
,
ternary search
x303
1662J
Training Camp
flows
,
graphs
x193
1662I
Ice Cream Shop
brute force
,
implementation
,
sortings
x1950
1662H
Boundary
brute force
,
math
x2780
1662G
Gastronomic Event
dp
,
greedy
,
trees
x443
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x958
1662E
Round Table
math
x126
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x1674
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x288
1662B
Toys
greedy
,
strings
x130
1662A
Organizing SWERC
brute force
,
implementation
x4143
1661F
Teleporters
binary search
,
greedy
2600
x549
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x910
1661D
Progressions Covering
data structures
,
greedy
1900
x4502
1661C
Water the Trees
binary search
,
greedy
,
math
1700
x8940
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x16925
1661A
Array Balancing
greedy
,
math
800
x18181
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2585
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x6961
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x6942
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8089
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x18690
1660B
Vlad and Candies
math
800
x27442
1660A
Vasya and Coins
greedy
,
math
800
x34930
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x177
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Codeforces Round 941 (Div. 1)
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2 days
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*has extra registration
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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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