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combine-tags-by-or
*combine tags by OR
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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Custom test
Problems
#
Name
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1895
438D
The Child and Sequence
data structures
,
math
2300
x8777
437E
The Child and Polygon
dp
,
geometry
2500
x707
437D
The Child and Zoo
dsu
,
sortings
1900
x3399
436F
Banners
brute force
,
data structures
,
dp
3000
x400
436E
Cardboard Box
data structures
,
greedy
2600
x1397
436D
Pudding Monsters
dp
2800
x326
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2680
435E
Special Graph
2500
x244
435D
Special Grid
brute force
,
dp
,
greedy
2000
x761
435C
Cardiogram
implementation
1600
x2582
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x273
434D
Nanami's Power Plant
flows
2900
x467
433E
Tachibana Kanade's Tofu
dp
2500
x483
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1245
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2489
432E
Square Tiling
constructive algorithms
,
greedy
2300
x701
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x9289
432C
Prime Swaps
greedy
,
sortings
1800
x2523
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x1027
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2324
431C
k-Tree
dp
,
implementation
,
trees
1600
x25849
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2282
429E
Points and Segments
graphs
3000
x894
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2949
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x953
429B
Working out
dp
1600
x8754
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1435
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2219
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x14164
425E
Sereja and Sets
dp
2500
x682
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1461
425C
Sereja and Two Sequences
data structures
,
dp
2300
x904
425B
Sereja and Table
bitmasks
,
greedy
2200
x1314
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x134
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x568
424C
Magic Formulas
math
1600
x5444
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x541
420E
Playing the ball
geometry
2600
x219
420D
Cup Trick
data structures
2200
x845
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1268
420B
Online Meeting
implementation
1800
x1045
418E
Tricky Password
data structures
3100
x318
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x483
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x842
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2531
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1510
416D
Population Size
greedy
,
implementation
,
math
2400
x951
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8057
414E
Mashmokh's Designed Problem
data structures
3200
x200
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x687
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2226
413E
Maze 2D
data structures
,
divide and conquer
2200
x744
413D
2048
bitmasks
,
dp
2000
x822
412E
E-mail Addresses
implementation
1900
x847
412D
Giving Awards
dfs and similar
2000
x1969
411C
Kicker
implementation
1700
x1229
411B
Multi-core Processor
implementation
1600
x1280
409I
Feed the Golorp
*special problem
2400
x127
409G
On a plane
*special problem
,
geometry
2200
x521
409F
000001
*special problem
1900
x2093
409E
Dome
*special problem
1800
x579
409D
Big Data
*special problem
1700
x1716
409C
Magnum Opus
*special problem
1700
x1983
409B
Mysterious Language
*special problem
1700
x1359
409A
The Great Game
*special problem
1700
x2469
407E
k-d-sequence
data structures
3100
x796
407D
Largest Submatrix 3
dp
,
hashing
2700
x679
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x1012
407B
Long Path
dp
,
implementation
1600
x6611
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4913
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x248
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1183
405E
Graph Cutting
dfs and similar
,
graphs
2300
x1440
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3125
405C
Unusual Product
implementation
,
math
1600
x4680
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x579
404D
Minesweeper 1D
dp
,
implementation
1900
x2162
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5240
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x219
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1118
402E
Strictly Positive Matrix
graphs
,
math
2200
x2201
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2626
401E
Olympic Games
math
2500
x168
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4198
400E
Inna and Binary Logic
binary search
,
bitmasks
,
data structures
2100
x972
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2918
388E
Fox and Meteor Shower
geometry
3100
x122
388D
Fox and Perfect Sets
math
2700
x446
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3431
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2482
387E
George and Cards
binary search
,
data structures
2200
x890
387D
George and Interesting Graph
graph matchings
2200
x1021
387C
George and Number
greedy
,
implementation
1700
x2188
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x443
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x804
385E
Bear in the Field
math
,
matrices
2300
x590
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x811
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9715
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x3163
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