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Codeforces Round (Div. 2)
3 days
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*has extra registration
→ Filter Problems
Difficulty:
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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
#
Name
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x191
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x190
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x840
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x979
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x92
1187F
Expected Square Beauty
dp
,
math
,
probabilities
2500
x854
1172C2
Nauuo and Pictures (hard version)
dp
,
probabilities
2600
x825
1172C1
Nauuo and Pictures (easy version)
dp
,
probabilities
2300
x1050
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1351
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x765
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1159
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x319
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x2094
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2794
1097D
Makoto and a Blackboard
dp
,
math
,
number theory
,
probabilities
2200
x2629
1096F
Inversion Expectation
dp
,
math
,
probabilities
2300
x1616
1096E
The Top Scorer
combinatorics
,
dp
,
math
,
probabilities
2500
x932
1081G
Mergesort Strikes Back
math
,
probabilities
3200
x344
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x364
1061F
Lost Root
interactive
,
probabilities
2400
x720
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x646
1042E
Vasya and Magic Matrix
dp
,
math
,
probabilities
2300
x1706
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2334
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2939
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x230
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1848
952D
I'm Feeling Lucky!
probabilities
1800
x2418
949F
Astronomy
geometry
,
probabilities
3300
x58
935D
Fafa and Ancient Alphabet
math
,
probabilities
1900
x2537
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2628
913H
Don't Exceed
math
,
probabilities
3400
x124
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x613
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x1970
908D
New Year and Arbitrary Arrangement
dp
,
math
,
probabilities
2200
x2270
896C
Willem, Chtholly and Seniorious
data structures
,
probabilities
2600
x3225
895E
Eyes Closed
data structures
,
probabilities
2300
x964
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1198
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x1039
846F
Random Query
data structures
,
math
,
probabilities
,
two pointers
1800
x2224
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2198
840D
Destiny
data structures
,
probabilities
2500
x2848
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x16209
802F
Marmots (hard)
math
,
probabilities
2800
x121
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x1008
768D
Jon and Orbs
dp
,
math
,
probabilities
2200
x2800
749E
Inversions After Shuffle
data structures
,
probabilities
2400
x1036
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2090
717H
Pokermon League challenge
math
,
probabilities
2400
x420
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1387
712E
Memory and Casinos
data structures
,
math
,
probabilities
2500
x606
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1248
698C
LRU
bitmasks
,
dp
,
math
,
probabilities
2400
x1284
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3411
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x312
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x2009
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x430
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x585
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1099
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x572
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x975
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2684
623D
Birthday
greedy
,
math
,
probabilities
2700
x471
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5355
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x232
605E
Intergalaxy Trips
probabilities
,
shortest paths
2700
x1331
601C
Kleofáš and the n-thlon
dp
,
math
,
probabilities
2300
x1292
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x680
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x427
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x542
540D
Bad Luck Island
dp
,
probabilities
1900
x5277
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6827
513G2
Inversions problem
dp
,
probabilities
2400
x638
513C
Second price auction
bitmasks
,
probabilities
2000
x1526
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1151
494C
Helping People
dp
,
probabilities
2600
x843
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x886
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29651
464D
World of Darkraft - 2
dp
,
probabilities
2700
x662
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x273
453A
Little Pony and Expected Maximum
probabilities
1600
x10143
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1606
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x385
444B
DZY Loves FFT
probabilities
2300
x1056
442B
Andrey and Problem
greedy
,
math
,
probabilities
1800
x4955
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x682
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x129
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x787
398B
Painting The Wall
dp
,
probabilities
x1000
364D
Ghd
brute force
,
math
,
probabilities
2900
x2000
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2305
345A
Expecting Trouble
*special problem
,
probabilities
1500
x478
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x219
312B
Archer
math
,
probabilities
1300
x11246
303E
Random Ranking
dp
,
math
,
probabilities
3000
x315
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x236
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3621
277D
Google Code Jam
dp
,
probabilities
2800
x331
268E
Playlist
math
,
probabilities
,
sortings
2100
x981
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1374
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1223
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