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Before contest
Codeforces Round (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
probabilities
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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Problems
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Status
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Custom test
Problems
#
Name
1578G
Game of Chance
math
,
probabilities
3500
x20
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x33
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x46
949F
Astronomy
geometry
,
probabilities
3300
x46
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x80
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x82
98B
Help King
implementation
,
probabilities
,
trees
2200
x93
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x99
802F
Marmots (hard)
math
,
probabilities
2800
x106
107E
Darts
geometry
,
probabilities
2700
x110
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x111
913H
Don't Exceed
math
,
probabilities
3400
x112
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x119
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x125
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x155
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x162
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x166
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x183
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x198
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x206
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x207
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x214
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x217
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x223
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x225
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x227
1081G
Mergesort Strikes Back
math
,
probabilities
3200
x238
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x241
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x241
303E
Random Ranking
dp
,
math
,
probabilities
3000
x241
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x261
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x274
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x275
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x280
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x281
277D
Google Code Jam
dp
,
probabilities
2800
x292
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x293
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x298
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x347
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x348
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x353
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x354
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x362
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x374
717H
Pokermon League challenge
math
,
probabilities
2400
x386
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x398
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x399
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x404
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x410
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x410
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x423
623D
Birthday
greedy
,
math
,
probabilities
2700
x431
345A
Expecting Trouble
*special problem
,
probabilities
1500
x434
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x445
1267G
Game Relics
math
,
probabilities
3000
x458
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x467
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x467
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x468
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x475
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x478
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x486
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x488
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x498
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x501
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x515
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x524
712E
Memory and Casinos
data structures
,
math
,
probabilities
2500
x545
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x546
513G2
Inversions problem
dp
,
probabilities
2400
x564
113D
Museum
math
,
matrices
,
probabilities
2700
x564
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x566
50D
Bombing
binary search
,
dp
,
probabilities
2100
x568
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x577
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x577
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x578
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x578
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x581
464D
World of Darkraft - 2
dp
,
probabilities
2700
x590
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x596
1349D
Slime and Biscuits
math
,
probabilities
3200
x609
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x614
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x630
1061F
Lost Root
interactive
,
probabilities
2400
x630
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x636
1172C2
Nauuo and Pictures (hard version)
dp
,
probabilities
2600
x637
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x644
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x649
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x662
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x664
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x673
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x683
494C
Helping People
dp
,
probabilities
2600
x685
1187F
Expected Square Beauty
dp
,
math
,
probabilities
2500
x715
1096E
The Top Scorer
combinatorics
,
dp
,
math
,
probabilities
2500
x749
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x752
105B
Dark Assembly
brute force
,
probabilities
1800
x763
895E
Eyes Closed
data structures
,
probabilities
2300
x773
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x774
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x784
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x789
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