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Name
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16929
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x214
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x325
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1035
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1851
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2844
1815A
Ian and Array Sorting
greedy
,
math
1300
x13444
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x464
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1249
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x818
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10177
1814B
Long Legs
brute force
,
math
1700
x9519
1814A
Coins
implementation
,
math
800
x25652
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5791
1812I
Mountain Climber
*special problem
x250
1812H
Expected Twist
*special problem
,
interactive
x132
1812G
Colour Vision
*special problem
,
implementation
x523
1812F
Factorization
*special problem
,
number theory
x955
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3940
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4336
1812C
Digits
*special problem
x1222
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5569
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13051
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1619
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1912
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1727
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11546
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7031
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x18881
1811B
Conveyor Belts
implementation
,
math
1000
x19721
1811A
Insert Digit
greedy
,
math
,
strings
800
x30014
1810H
Last Number
combinatorics
,
math
2900
x129
1810G
The Maximum Prefix
dp
3200
x632
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x538
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2967
1810D
Climbing the Tree
binary search
,
math
1700
x7077
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x13780
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17134
1810A
Beautiful Sequence
brute force
,
greedy
800
x20341
1809G
Prediction
combinatorics
,
dp
,
math
2800
x411
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x704
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x790
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5885
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x11912
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19035
1809A
Garland
implementation
800
x23413
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x418
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x646
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1251
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2165
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3580
1808B
Playing in a Casino
math
,
sortings
1200
x14649
1808A
Lucky Numbers
brute force
,
implementation
900
x17318
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17682
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17838
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5877
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11871
1807D
Odd Queries
data structures
,
implementation
900
x28672
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29166
1807B
Grab the Candies
greedy
800
x39773
1807A
Plus or Minus
implementation
800
x55773
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x267
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2683
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x847
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7197
1806B
Mex Master
constructive algorithms
,
greedy
900
x17027
1806A
Walking Master
geometry
,
greedy
,
math
800
x22282
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x325
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x815
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1523
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6041
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12013
1805B
The String Has a Target
greedy
,
strings
800
x18169
1805A
We Need the Zero
bitmasks
,
brute force
800
x21026
1804H
Code Lock
bitmasks
,
dp
3300
x169
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x852
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1359
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4417
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11518
1804B
Vaccination
greedy
,
implementation
1000
x13778
1804A
Lame King
greedy
,
math
800
x17675
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12900
1802A
Likes
greedy
,
implementation
800
x15513
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x348
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x546
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2039
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3222
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5799
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8110
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1930
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3690
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12043
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12146
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21685
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21341
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22362
1800B
Count the Number of Pairs
greedy
,
strings
1000
x23944
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combine-tags-by-or
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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
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shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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