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Codeforces Round 974 (Div. 3)
14:06:00
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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
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x870
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1469
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1884
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8353
1614E
Divan and a Cottage
binary search
,
data structures
2600
x826
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2317
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3866
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x684
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5157
1613D
MEX Sequences
dp
,
math
1900
x4590
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x837
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x604
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2491
1612D
X-Magic Pair
math
,
number theory
1600
x9118
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x639
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6426
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3807
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7247
1610I
Mashtali vs AtCoder
games
,
trees
3100
x283
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x492
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x440
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x530
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1668
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2696
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x11504
1609H
Pushing Robots
3500
x92
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x398
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x776
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x2068
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7276
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x157
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x584
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x434
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1384
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6624
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1229
1607G
Banquet Preparations 1
greedy
2200
x1551
1607F
Robot on the Board 2
brute force
,
dfs and similar
,
graphs
,
implementation
2300
x1935
1607E
Robot on the Board 1
implementation
1600
x9293
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x558
1606E
Arena
combinatorics
,
dp
,
math
2100
x3508
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1434
1605F
PalindORme
combinatorics
,
dp
2900
x302
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1029
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2923
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x279
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x421
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x672
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x2034
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13503
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x176
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x474
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1445
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x2005
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4935
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x484
1600E
Array Game
games
,
greedy
,
two pointers
1900
x2085
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x298
1599I
Desert
data structures
,
graphs
2700
x119
1599H
Hidden Fortress
interactive
,
math
2100
x1048
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x370
1599F
Mars
hashing
2700
x335
1599E
Two Arrays
data structures
,
matrices
3200
x67
1599D
Bubble Popping
3200
x30
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1645
1599B
Restaurant Game
3100
x139
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x675
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x331
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1417
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2295
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8632
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1338
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1480
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7461
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1682
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2432
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x12331
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4968
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
x7935
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
x1223
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1050
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3839
1584G
Eligible Segments
geometry
3200
x209
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x926
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1265
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3655
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
1582G
Kuzya and Homework
data structures
,
number theory
2600
x594
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