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Before contest
Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
13:59:26
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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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Problems
#
Name
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x469
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1418
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1962
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4868
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x466
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1991
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x287
1599I
Desert
data structures
,
graphs
2700
x114
1599H
Hidden Fortress
interactive
,
math
2100
x1031
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x364
1599F
Mars
hashing
2700
x311
1599E
Two Arrays
data structures
,
matrices
3200
x67
1599D
Bubble Popping
3200
x30
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1623
1599B
Restaurant Game
3100
x137
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x638
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x328
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1395
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2268
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8501
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1282
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1461
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7284
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1658
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2394
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4884
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x691
1592F1
Alice and Recoloring 1
constructive algorithms
,
greedy
2600
x802
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1569
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2193
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7779
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x275
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x191
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x175
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1182
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1033
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3774
1584G
Eligible Segments
geometry
3200
x204
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x902
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1244
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3603
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x318
1583G
Omkar and Time Travel
data structures
,
math
3000
x432
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x1248
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2178
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5312
1583C
Omkar and Determination
data structures
,
dp
1700
x6861
1582G
Kuzya and Homework
data structures
,
number theory
2600
x570
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1754
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5421
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3661
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x131
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x72
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x801
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1712
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x1004
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3606
1579G
Minimal Coverage
dp
2200
x2311
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4677
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6525
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x439
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1072
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x348
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x225
1578I
Interactive Rays
geometry
,
interactive
3300
x59
1578H
Higher Order Functions
implementation
,
strings
1700
x2003
1578G
Game of Chance
math
,
probabilities
3500
x36
1578F
Framing Pictures
geometry
2900
x148
1578D
Dragon Curve
3200
x44
1578C
Cactus Lady and her Cing
3500
x9
1578B
Building Forest Trails
data structures
,
dsu
2800
x325
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x336
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x243
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1313
1575K
Knitting Batik
implementation
,
math
2200
x671
1575I
Illusions of the Desert
data structures
,
trees
2300
x853
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x597
1575G
GCD Festival
math
,
number theory
2200
x663
1575F
Finding Expected Value
math
2900
x111
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x323
1575D
Divisible by Twenty-Five
brute force
,
dfs and similar
,
dp
1800
x2447
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x159
1575B
Building an Amusement Park
binary search
,
geometry
2300
x458
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x597
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x888
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4409
1572F
Stations
data structures
3400
x252
1572E
Polygon
binary search
,
dp
,
geometry
3000
x283
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x486
1572C
Paint
dp
,
greedy
2700
x1417
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1774
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8727
1571J
Two Railroads
*special problem
3000
x39
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x57
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x47
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x74
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x180
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x332
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x326
1571C
Rhyme
*special problem
,
implementation
1800
x371
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