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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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Problems
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Status
Standings
Custom test
Problems
#
Name
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x806
1672F1
Array Shuffling
constructive algorithms
,
graphs
,
greedy
2000
x3088
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2239
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x6229
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x13225
1672B
I love AAAB
constructive algorithms
,
implementation
800
x15831
1672A
Log Chopping
games
,
implementation
,
math
800
x16071
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x332
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2743
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x7653
1671C
Dolce Vita
binary search
,
brute force
,
greedy
,
math
1200
x17201
1671B
Consecutive Points Segment
brute force
,
math
,
sortings
1000
x18534
1671A
String Building
implementation
800
x20455
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x975
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1753
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x5137
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9956
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x12712
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x15423
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x18615
1669G
Fall Down
dfs and similar
,
implementation
1200
x18283
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x25863
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x17889
1669D
Colorful Stamp
implementation
1100
x22220
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x34682
1669B
Triple
implementation
,
sortings
800
x43196
1669A
Division?
implementation
800
x62987
1668B
Social Distance
greedy
,
math
,
sortings
900
x16650
1668A
Direction Change
implementation
,
math
800
x16303
1667F
Yin Yang
implementation
3500
x99
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x651
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x665
1667C
Half Queen Cover
constructive algorithms
,
math
2400
x1580
1667B
Optimal Partition
data structures
,
dp
2100
x3695
1667A
Make it Increasing
brute force
,
greedy
,
math
1300
x14700
1666L
Labyrinth
dfs and similar
,
graphs
1800
x3114
1666K
Kingdom Partition
flows
3200
x245
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1333
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1452
1666H
Heroes of Might
math
3500
x67
1666G
Global Warming
geometry
,
math
3100
x136
1666F
Fancy Stack
combinatorics
,
dp
,
implementation
2200
x1162
1666E
Even Split
binary search
,
constructive algorithms
,
greedy
,
math
2500
x725
1666D
Deletive Editing
greedy
900
x8526
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x3181
1666B
Budget Distribution
3300
x54
1666A
Admissible Map
3300
x110
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1518
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3958
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8368
1665B
Array Cloning Technique
constructive algorithms
,
greedy
,
sortings
900
x20414
1665A
GCD vs LCM
constructive algorithms
,
math
800
x23602
1663H
Cross-Language Program
*special problem
,
constructive algorithms
x1283
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x211
1663F
In Every Generation...
*special problem
,
strings
x346
1663E
Are You Safe?
*special problem
,
implementation
x553
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1412
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5673
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3400
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10491
1662O
Circular Maze
brute force
,
dfs and similar
,
graphs
,
implementation
x1358
1662N
Drone Photo
combinatorics
,
math
,
sortings
x755
1662M
Bottle Arrangements
constructive algorithms
x3460
1662L
Il Derby della Madonnina
data structures
,
dp
,
math
x1068
1662K
Pandemic Restrictions
geometry
,
ternary search
x334
1662J
Training Camp
flows
,
graphs
x230
1662I
Ice Cream Shop
brute force
,
implementation
,
sortings
x2119
1662H
Boundary
brute force
,
math
x2979
1662G
Gastronomic Event
dp
,
greedy
,
trees
x467
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x1033
1662E
Round Table
math
x143
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x1818
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x324
1662B
Toys
greedy
,
strings
x136
1662A
Organizing SWERC
brute force
,
implementation
x4344
1661F
Teleporters
binary search
,
greedy
2600
x586
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x950
1661D
Progressions Covering
data structures
,
greedy
1900
x4740
1661C
Water the Trees
binary search
,
greedy
,
math
1700
x9327
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17730
1661A
Array Balancing
greedy
,
math
800
x18364
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2717
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x7272
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x7306
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8661
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x19563
1660B
Vlad and Candies
math
800
x28080
1660A
Vasya and Coins
greedy
,
math
800
x35962
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x191
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1570
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x4008
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x10497
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10931
1659A
Red Versus Blue
constructive algorithms
,
greedy
,
implementation
,
math
1000
x18742
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x769
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1047
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2541
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x9074
1658C
Shinju and the Lost Permutation
constructive algorithms
,
math
1700
x9323
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18593
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