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Problems
#
Name
1423G
Growing flowers
data structures
3500
x180
1423F
Coins
math
2700
x361
1423E
5G Antenna Towers
geometry
2700
x74
1423D
Does anyone else hate the wind?
3100
x35
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x130
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1772
1423A
Wakanda Forever
3500
x66
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x971
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x730
1422D
Returning Home
graphs
,
shortest paths
,
sortings
2300
x2591
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8082
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14179
1422A
Fence
geometry
,
math
800
x20645
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x674
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4053
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12496
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x12885
1421A
XORwice
bitmasks
,
greedy
,
math
800
x27333
1420E
Battle Lemmings
dp
,
greedy
2500
x849
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7342
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4507
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17034
1420B
Rock and Lever
bitmasks
,
math
1200
x23757
1420A
Cubes Sorting
math
,
sortings
900
x22860
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x474
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3142
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14783
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x23646
1419C
Killjoy
greedy
,
implementation
,
math
1500
x14927
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15966
1419A
Digit Game
games
,
greedy
,
implementation
900
x19270
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1465
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x357
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1726
1418D
Trash Problem
data structures
,
implementation
2100
x4185
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x18269
1418B
Negative Prefixes
greedy
,
sortings
1300
x16298
1418A
Buying Torches
math
1000
x21439
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14336
1417A
Copy-paste
greedy
,
math
800
x18052
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x373
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x277
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1874
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4186
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5909
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11764
1415F
Cakes for Clones
dp
2900
x405
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2581
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5186
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10665
1415B
Repainting Street
brute force
,
brute force
,
greedy
1100
x12008
1415A
Prison Break
brute force
,
math
800
x14929
1413F
Roads and Ramen
data structures
,
trees
2800
x706
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x1913
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6340
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5542
1413B
A New Technique
implementation
1100
x11614
1413A
Finding Sasuke
constructive algorithms
,
math
800
x14596
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x580
1411F
The Thorny Path
greedy
,
math
3000
x320
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1556
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2427
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7774
1411B
Fair Numbers
brute force
,
number theory
1000
x17858
1411A
In-game Chat
implementation
800
x20145
1409F
Subsequences of Length Two
dp
,
strings
2100
x4274
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7573
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x18712
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22758
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x28278
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x62671
1408I
Bitwise Magic
dp
,
math
3200
x166
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x352
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x927
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2263
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1877
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4165
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8628
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9765
1408A
Circle Coloring
constructive algorithms
800
x12398
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1604
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4633
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11423
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16692
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20084
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1553
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3374
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9838
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22065
1406A
Subset Mex
greedy
,
implementation
,
math
900
x20967
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x21039
1405A
Permutation Forgery
constructive algorithms
800
x21245
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1095
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x984
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2496
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7094
1404A
Balanced Bitstring
implementation
,
strings
1500
x14796
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x286
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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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