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Problems
#
Name
97B
Superset
constructive algorithms
,
divide and conquer
2300
x804
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x803
10E
Greedy Change
constructive algorithms
2600
x803
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x802
1017F
The Neutral Zone
brute force
,
math
2500
x802
1251F
Red-White Fence
combinatorics
,
fft
2500
x801
1250E
The Coronation
graphs
,
implementation
2300
x801
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x801
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x801
1468G
Hobbits
binary search
,
geometry
2500
x799
722E
Research Rover
combinatorics
,
dp
2900
x799
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x799
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x798
535E
Tavas and Pashmaks
geometry
,
math
2600
x798
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x798
105B
Dark Assembly
brute force
,
probabilities
1800
x797
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x796
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x796
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x796
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x795
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x795
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x794
248C
Robo-Footballer
binary search
,
geometry
2000
x794
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x793
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x792
827E
Rusty String
fft
,
math
,
strings
2700
x792
162A
Pentagonal numbers
*special problem
,
implementation
1100
x792
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x791
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x790
1145C
Mystery Circuit
bitmasks
,
brute force
x790
1030F
Putting Boxes Together
data structures
2500
x790
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x790
605D
Board Game
data structures
,
dfs and similar
2500
x789
1768F
Wonderful Jump
dp
,
greedy
2900
x787
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x787
683A
The Check of the Point
*special problem
,
geometry
1200
x787
1091F
New Year and the Mallard Expedition
constructive algorithms
,
greedy
2600
x786
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x785
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x785
578D
LCS Again
dp
,
greedy
2700
x785
277B
Set of Points
constructive algorithms
,
geometry
2300
x783
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x781
1103C
Johnny Solving
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x779
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x779
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x779
607C
Marbles
hashing
,
strings
2500
x779
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x779
225E
Unsolvable
math
,
number theory
2100
x779
1949F
Dating
greedy
,
sortings
,
trees
2200
x778
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x778
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x778
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x778
199B
Special Olympics
geometry
1900
x778
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x777
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x777
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x777
704D
Captain America
flows
,
greedy
3100
x776
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x775
568C
New Language
2-sat
,
greedy
2600
x775
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x774
1693D
Decinc Dividing
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
2800
x773
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x773
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x773
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x773
293B
Distinct Paths
brute force
,
combinatorics
2700
x773
162C
Prime factorization
*special problem
1800
x773
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x772
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x772
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x771
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x771
1734F
Zeros and Ones
bitmasks
,
divide and conquer
,
dp
,
math
2500
x770
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x770
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x770
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x770
28A
Bender Problem
implementation
1600
x769
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x768
420D
Cup Trick
data structures
2200
x768
666C
Codeword
combinatorics
,
strings
2500
x767
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x767
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x766
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x765
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x765
575A
Fibonotci
data structures
,
math
,
matrices
2700
x765
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x764
1531B2
Мониторинг
*special problem
x764
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x764
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x763
727F
Polycarp's problems
binary search
,
dp
,
greedy
2300
x763
1592F1
Alice and Recoloring 1
constructive algorithms
,
greedy
2600
x762
1533B
Nearest Point Function
*special problem
,
implementation
x762
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x762
188A
Hexagonal Numbers
*special problem
1100
x762
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x761
809D
Hitchhiking in the Baltic States
data structures
,
dp
2900
x760
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x760
153A
A + B
*special problem
1600
x760
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x759
1740F
Conditional Mix
combinatorics
,
dp
,
math
2600
x759
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x759
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x758
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2-sat
binary search
bitmasks
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data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
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graph matchings
graphs
greedy
hashing
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matrices
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number theory
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