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Before contest
Codeforces Round 974 (Div. 3)
02:51:05
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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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Custom test
Problems
#
Name
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x12334
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4968
1593D1
All are Same
math
,
number theory
1100
x20102
1593C
Save More Mice
binary search
,
greedy
,
greedy
1000
x24762
1593B
Make it Divisible by 25
dfs and similar
,
dp
,
greedy
,
math
,
math
900
x26970
1593A
Elections
math
800
x36602
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x721
1592F1
Alice and Recoloring 1
constructive algorithms
,
greedy
2600
x852
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1631
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2221
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7937
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15930
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x22111
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x283
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x192
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x181
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1224
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1050
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3839
1585C
Minimize Distance
greedy
1300
x11974
1585B
Array Eversion
greedy
900
x15080
1585A
Life of a Flower
implementation
800
x17735
1584G
Eligible Segments
geometry
3200
x209
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x927
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1265
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3655
1584C
Two Arrays
greedy
,
math
,
sortings
900
x16314
1584B
Coloring Rectangles
greedy
,
math
1000
x13319
1584A
Mathematical Addition
math
800
x14878
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x323
1583G
Omkar and Time Travel
data structures
,
math
3000
x452
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x1290
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2212
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5370
1583C
Omkar and Determination
data structures
,
dp
1700
x6925
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x12193
1583A
Windblume Ode
math
,
number theory
800
x13713
1582G
Kuzya and Homework
data structures
,
number theory
2600
x594
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1801
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5554
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3726
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x10472
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x15522
1582B
Luntik and Subsequences
combinatorics
,
math
900
x20312
1582A
Luntik and Concerts
math
800
x18492
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x11302
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13403
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x133
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x73
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x872
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1790
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x1034
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3647
1579G
Minimal Coverage
dp
2200
x2367
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4762
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6628
1579E1
Permutation Minimization by Deque
constructive algorithms
,
greedy
,
math
1000
x21533
1579D
Productive Meeting
constructive algorithms
,
graphs
,
greedy
1400
x15936
1579C
Ticks
greedy
,
implementation
1500
x10558
1579B
Shifting Sort
implementation
,
sortings
1100
x18110
1579A
Casimir's String Solitaire
math
,
strings
800
x38740
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x456
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1128
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x359
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x231
1578I
Interactive Rays
geometry
,
interactive
3300
x63
1578H
Higher Order Functions
implementation
,
strings
1700
x2023
1578G
Game of Chance
math
,
probabilities
3500
x38
1578F
Framing Pictures
geometry
2900
x161
1578E
Easy Scheduling
implementation
,
math
1200
x3807
1578D
Dragon Curve
3200
x46
1578C
Cactus Lady and her Cing
3500
x9
1578B
Building Forest Trails
data structures
,
dsu
2800
x338
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x355
1576A
Communication Routing Challenge
*special problem
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x246
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1365
1575K
Knitting Batik
implementation
,
math
2200
x694
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3789
1575I
Illusions of the Desert
data structures
,
trees
2300
x884
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x611
1575G
GCD Festival
math
,
number theory
2200
x679
1575F
Finding Expected Value
math
2900
x120
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x329
1575D
Divisible by Twenty-Five
brute force
,
dfs and similar
,
dp
1800
x2515
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x163
1575B
Building an Amusement Park
binary search
,
geometry
2300
x472
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4444
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x620
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x903
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4480
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x17029
1574B
Combinatorics Homework
combinatorics
,
greedy
,
math
1100
x17275
1574A
Regular Bracket Sequences
constructive algorithms
800
x21761
1573B
Swaps
greedy
,
math
,
sortings
1400
x14510
1573A
Countdown
greedy
800
x21123
1572F
Stations
data structures
3400
x256
1572E
Polygon
binary search
,
dp
,
geometry
3000
x286
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x501
1572C
Paint
dp
,
greedy
2700
x1476
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