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Before contest
Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
07:57:10
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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
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x808
627C
Package Delivery
data structures
,
divide and conquer
,
greedy
2200
x1158
627B
Factory Repairs
data structures
1700
x2734
627A
XOR Equation
dp
,
math
1700
x4044
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x522
626F
Group Projects
dp
2400
x2733
626E
Simple Skewness
binary search
,
math
,
ternary search
2400
x1308
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2693
625E
Frog Fights
data structures
,
greedy
2800
x326
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x626
625A
Guest From the Past
implementation
,
math
1700
x5368
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x543
623D
Birthday
greedy
,
math
,
probabilities
2700
x471
623C
Electric Charges
binary search
,
dp
2900
x450
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2059
623A
Graph and String
constructive algorithms
,
graphs
1800
x4409
622F
The Sum of the k-th Powers
math
2600
x3610
622E
Ants in Leaves
dfs and similar
,
greedy
,
sortings
,
trees
2200
x2019
622D
Optimal Number Permutation
constructive algorithms
1900
x2905
622C
Not Equal on a Segment
data structures
,
implementation
1700
x6317
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2759
621D
Rat Kwesh and Cheese
brute force
,
constructive algorithms
,
math
2400
x968
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5382
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x716
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5365
620D
Professor GukiZ and Two Arrays
binary search
,
two pointers
2200
x1668
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x232
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1340
618E
Robot Arm
data structures
,
geometry
2500
x587
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1700
617E
XOR and Favorite Number
data structures
2200
x8074
617D
Polyline
constructive algorithms
,
implementation
1700
x4178
616F
Expensive Strings
string suffix structures
,
strings
2700
x573
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x2780
615E
Hexagons
binary search
,
implementation
,
math
2100
x968
615D
Multipliers
math
,
number theory
2000
x3842
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2261
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x457
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2796
613C
Necklace
constructive algorithms
,
math
2500
x991
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2181
613A
Peter and Snow Blower
binary search
,
geometry
,
ternary search
1900
x3197
612F
Simba on the Circle
dp
2600
x377
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1620
612D
The Union of k-Segments
greedy
,
sortings
1800
x3748
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x580
611G
New Year and Cake
geometry
,
two pointers
2900
x430
611F
New Year and Cleaning
binary search
,
implementation
2500
x462
611E
New Year and Three Musketeers
data structures
,
greedy
,
sortings
2400
x861
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2565
610E
Alphabet Permutations
data structures
,
strings
2500
x859
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1463
610C
Harmony Analysis
constructive algorithms
1800
x2810
609F
Frogs and mosquitoes
data structures
,
greedy
2500
x1217
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x7392
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2644
607E
Cross Sum
binary search
,
geometry
3300
x250
607D
Power Tree
data structures
,
trees
2600
x563
607C
Marbles
hashing
,
strings
2500
x782
607B
Zuma
dp
1900
x11408
605E
Intergalaxy Trips
probabilities
,
shortest paths
2700
x1357
605D
Board Game
data structures
,
dfs and similar
2500
x795
605C
Freelancer's Dreams
geometry
2400
x1101
605B
Lazy Student
constructive algorithms
,
data structures
,
graphs
1700
x3405
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1206
603D
Ruminations on Ruminants
geometry
,
math
2900
x340
603C
Lieges of Legendre
games
,
math
2200
x1815
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2551
601E
A Museum Robbery
data structures
,
dp
2800
x848
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1100
601C
Kleofáš and the n-thlon
dp
,
math
,
probabilities
2300
x1294
601B
Lipshitz Sequence
data structures
,
math
2100
x2269
600F
Edge coloring of bipartite graph
graphs
2800
x756
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x13048
600D
Area of Two Circles' Intersection
geometry
2000
x2192
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x5954
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x627
599D
Spongebob and Squares
brute force
,
math
1900
x2541
598F
Cut Length
geometry
2900
x362
598E
Chocolate Bar
brute force
,
dp
2000
x4748
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10753
598C
Nearest vectors
geometry
,
sortings
2300
x4238
597C
Subsequences
data structures
,
dp
1900
x4734
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x390
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x680
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2242
594E
Cutting the Line
string suffix structures
,
strings
3100
x158
594D
REQ
data structures
,
number theory
2500
x1565
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x677
594B
Max and Bike
binary search
,
geometry
2500
x490
594A
Warrior and Archer
games
2300
x1698
593E
Strange Calculation and Cats
dp
,
matrices
2400
x586
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1217
593C
Beautiful Function
constructive algorithms
,
math
2200
x279
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x213
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2552
592C
The Big Race
math
1800
x3052
590E
Birthday
graph matchings
,
strings
3200
x760
590D
Top Secret Task
dp
2300
x1153
590C
Three States
dfs and similar
,
graphs
,
shortest paths
2200
x2707
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