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Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 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
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6260
976B
Lara Croft and the New Game
implementation
,
math
1300
x5662
976A
Minimum Binary Number
implementation
800
x10359
975E
Hag's Khashba
geometry
2600
x300
975D
Ghosts
geometry
,
math
2000
x1867
975C
Valhalla Siege
binary search
1400
x9360
975B
Mancala
brute force
,
implementation
1100
x6732
975A
Aramic script
implementation
,
strings
900
x8952
967B
Watering System
math
,
sortings
1000
x6816
967A
Mind the Gap
implementation
1100
x4274
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1326
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x2957
965C
Greedy Arkady
math
2000
x2053
965B
Battleship
implementation
1300
x4469
965A
Paper Airplanes
math
800
x9333
964B
Messages
math
1300
x4286
964A
Splits
math
800
x9089
963E
Circles of Waiting
math
3100
x500
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1796
963C
Cutting Rectangle
brute force
,
math
,
number theory
2600
x558
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2691
963A
Alternating Sum
math
,
number theory
1800
x3219
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x125
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1206
962E
Byteland, Berland and Disputed Cities
constructive algorithms
,
greedy
2200
x1044
962D
Merge Equals
data structures
,
implementation
1600
x6650
962C
Make a Square
brute force
,
implementation
,
math
1400
x7741
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7583
962A
Equator
implementation
1300
x12515
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1283
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x647
961E
Tufurama
data structures
1900
x3433
961D
Pair Of Lines
geometry
2000
x4089
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5214
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19093
961A
Tetris
implementation
900
x9879
960H
Santa's Gift
data structures
,
trees
3100
x253
960G
Bandit Blues
combinatorics
,
dp
,
fft
,
math
2900
x1022
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x2661
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1805
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1676
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3806
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x7347
960A
Check the string
implementation
1200
x8014
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1933
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3300
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3043
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5670
959B
Mahmoud and Ehab and the message
dsu
,
greedy
,
implementation
1200
x9066
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x43867
958F3
Lightsabers (hard)
fft
2600
x660
958F2
Lightsabers (medium)
binary search
,
two pointers
1800
x1197
958F1
Lightsabers (easy)
implementation
1500
x1580
958E3
Guard Duty (hard)
geometry
2700
x177
958E2
Guard Duty (medium)
binary search
,
dp
,
greedy
,
sortings
2200
x895
958E1
Guard Duty (easy)
brute force
,
geometry
,
greedy
,
math
1600
x1466
958D2
Hyperspace Jump (hard)
2700
x84
958D1
Hyperspace Jump (easy)
expression parsing
,
math
1400
x2028
958C3
Encryption (hard)
data structures
,
dp
2500
x484
958C2
Encryption (medium)
dp
2000
x1134
958C1
Encryption (easy)
brute force
1200
x2765
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x609
958B1
Maximum Control (easy)
implementation
1000
x3302
958A3
Death Stars (hard)
3100
x44
958A2
Death Stars (medium)
hashing
,
strings
2000
x873
958A1
Death Stars (easy)
implementation
1400
x1634
957A
Tritonic Iridescence
implementation
1300
x5656
955F
Heaps
dp
,
trees
2600
x345
955E
Icicles
2900
x90
955D
Scissors
brute force
,
strings
2600
x453
955C
Sad powers
binary search
,
math
,
number theory
2100
x2451
955B
Not simply beatiful strings
implementation
1400
x4731
955A
Feed the cat
greedy
,
math
1100
x6545
954I
Yet Another String Matching Problem
fft
,
math
2200
x957
954H
Path Counting
combinatorics
,
dp
2500
x552
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x1893
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x975
954E
Water Taps
binary search
,
greedy
,
sortings
2000
x1797
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6282
954C
Matrix Walk
implementation
1700
x3685
954B
String Typing
implementation
,
strings
1400
x7092
954A
Diagonal Walking
implementation
800
x10365
952G
Puzzling Language
constructive algorithms
2200
x224
952F
2 + 2 != 4
2400
x366
952E
Cheese Board
2000
x622
952D
I'm Feeling Lucky!
probabilities
1800
x2388
952C
Ravioli Sort
implementation
1600
x2831
952B
A Map of the Cat
brute force
,
interactive
1900
x1978
952A
Quirky Quantifiers
math
800
x11100
950B
Intercepted Message
greedy
,
implementation
1100
x7290
950A
Left-handers, Right-handers and Ambidexters
implementation
,
math
800
x14867
949F
Astronomy
geometry
,
probabilities
3300
x57
949E
Binary Cards
brute force
2700
x595
949D
Curfew
binary search
,
brute force
,
greedy
,
sortings
2300
x811
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x1980
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3638
949A
Zebras
greedy
1600
x5176
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13338
946G
Almost Increasing Array
data structures
,
dp
2500
x647
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x528
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