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Please read
the new rule regarding the restriction on the use of AI tools
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→ Pay attention
Before contest
Codeforces Round (Div. 2)
6 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
964A
Splits
math
800
x9642
963E
Circles of Waiting
math
3100
x547
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x2029
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x577
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2797
963A
Alternating Sum
math
,
number theory
1800
x3300
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x182
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1332
962E
Byteland, Berland and Disputed Cities
constructive algorithms
,
greedy
2200
x1066
962D
Merge Equals
data structures
,
implementation
1600
x6875
962C
Make a Square
brute force
,
implementation
,
math
1400
x7832
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7675
962A
Equator
implementation
1300
x12800
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1350
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x788
961E
Tufurama
data structures
1900
x3610
961D
Pair Of Lines
geometry
2000
x4280
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5298
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x20863
961A
Tetris
implementation
900
x10054
960H
Santa's Gift
data structures
,
trees
3100
x277
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1067
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x2964
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1933
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1881
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3929
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x7967
960A
Check the string
implementation
1200
x8180
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x2089
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3436
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3090
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5777
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9620
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x46984
958F3
Lightsabers (hard)
fft
2600
x694
958F2
Lightsabers (medium)
binary search
,
two pointers
1800
x1232
958F1
Lightsabers (easy)
implementation
1500
x1611
958E3
Guard Duty (hard)
geometry
2700
x192
958E2
Guard Duty (medium)
binary search
,
dp
,
greedy
,
sortings
2200
x949
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1509
958D2
Hyperspace Jump (hard)
2700
x87
958D1
Hyperspace Jump (easy)
expression parsing
,
math
1400
x2066
958C3
Encryption (hard)
data structures
,
dp
2500
x548
958C2
Encryption (medium)
dp
2000
x1253
958C1
Encryption (easy)
brute force
1200
x2897
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x642
958B1
Maximum Control (easy)
implementation
1000
x3413
958A3
Death Stars (hard)
3100
x45
958A2
Death Stars (medium)
hashing
,
strings
2000
x904
958A1
Death Stars (easy)
implementation
1400
x1660
957A
Tritonic Iridescence
implementation
1300
x5764
955F
Heaps
dp
,
trees
2600
x374
955E
Icicles
2900
x94
955D
Scissors
brute force
,
strings
2600
x479
955C
Sad powers
binary search
,
math
,
number theory
2100
x2704
955B
Not simply beatiful strings
implementation
1400
x4822
955A
Feed the cat
greedy
,
math
1100
x6655
954I
Yet Another String Matching Problem
fft
,
math
2200
x1022
954H
Path Counting
combinatorics
,
dp
2500
x585
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x2143
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x1211
954E
Water Taps
binary search
,
greedy
,
sortings
2000
x1889
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6624
954C
Matrix Walk
implementation
1700
x3783
954B
String Typing
implementation
,
strings
1400
x7258
954A
Diagonal Walking
implementation
800
x10507
952G
Puzzling Language
constructive algorithms
2200
x237
952F
2 + 2 != 4
2400
x393
952E
Cheese Board
2000
x639
952D
I'm Feeling Lucky!
probabilities
1800
x2443
952C
Ravioli Sort
implementation
1600
x2906
952B
A Map of the Cat
brute force
,
interactive
1900
x2047
952A
Quirky Quantifiers
math
800
x11230
950B
Intercepted Message
greedy
,
implementation
1100
x7577
950A
Left-handers, Right-handers and Ambidexters
implementation
,
math
800
x15261
949F
Astronomy
geometry
,
probabilities
3300
x59
949E
Binary Cards
brute force
2700
x643
949D
Curfew
binary search
,
brute force
,
greedy
,
sortings
2300
x827
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x2048
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3727
949A
Zebras
greedy
1600
x5362
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13763
946G
Almost Increasing Array
data structures
,
dp
2500
x675
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x562
946E
Largest Beautiful Number
greedy
,
implementation
2200
x1097
946D
Timetable
dp
1800
x4423
946C
String Transformation
greedy
,
strings
1300
x8870
946B
Weird Subtraction Process
math
,
number theory
1100
x10862
946A
Partition
greedy
800
x16397
940F
Machine Learning
brute force
,
data structures
2600
x2612
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3725
940D
Alena And The Heater
binary search
,
implementation
1600
x3622
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5860
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x8978
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8293
939F
Cutlet
data structures
,
dp
2400
x943
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3118
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7320
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4630
939B
Hamster Farm
implementation
1000
x10507
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