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Before contest
Codeforces Round #850 (Div. 1, based on VK Cup 2022 - Final Round)
42:59:58
Register now »
*has extra registration
Before contest
Codeforces Round #850 (Div. 2, based on VK Cup 2022 - Final Round)
42:59:58
Register now »
*has extra registration
→ Filter Problems
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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
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
x1335
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
x1948
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x182
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x508
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x966
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x573
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1031
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x224
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x403
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x197
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x71
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x2904
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x995
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1148
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x5941
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x747
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x5536
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x2991
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x4788
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x451
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x321
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x528
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1225
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2031
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x340
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1283
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x391
1578G
Game of Chance
math
,
probabilities
3500
x20
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x30
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x258
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x240
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1002
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x4790
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2076
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x607
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x184
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1636
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1270
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x1823
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x380
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x112
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x713
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x94
1461C
Random Events
dp
,
math
,
probabilities
1500
x9844
1459A
Red-Blue Shuffle
math
,
probabilities
800
x15998
1454A
Special Permutation
constructive algorithms
,
probabilities
800
x34636
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x3834
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x391
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1539
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x441
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x645
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x914
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x436
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x611
1349D
Slime and Biscuits
math
,
probabilities
3200
x576
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x42
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x394
1310D
Tourism
dp
,
graphs
,
probabilities
2300
x1057
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x1840
1295F
Good Contest
combinatorics
,
dp
,
probabilities
2700
x765
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x458
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x5163
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1262
1267G
Game Relics
math
,
probabilities
3000
x438
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x2657
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x497
1264D1
Beautiful Bracket Sequence (easy version)
combinatorics
,
dp
,
probabilities
2600
x895
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1001
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x889
1245E
Hyakugoku and Ladders
dp
,
probabilities
,
shortest paths
2300
x1005
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x116
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x155
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x160
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x562
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x781
1190F
Tokitsukaze and Powers
number theory
,
probabilities
3400
x75
1187F
Expected Square Beauty
dp
,
math
,
probabilities
2500
x681
1172C2
Nauuo and Pictures (hard version)
dp
,
probabilities
2600
x611
1172C1
Nauuo and Pictures (easy version)
dp
,
probabilities
2300
x878
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1094
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x598
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x954
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x196
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x1683
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2450
1097D
Makoto and a Blackboard
dp
,
math
,
number theory
,
probabilities
2200
x2335
1096F
Inversion Expectation
dp
,
math
,
probabilities
2300
x1417
1096E
The Top Scorer
combinatorics
,
dp
,
math
,
probabilities
2500
x707
1081G
Mergesort Strikes Back
math
,
probabilities
3200
x214
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x264
1061F
Lost Root
interactive
,
probabilities
2400
x607
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x555
1042E
Vasya and Magic Matrix
dp
,
math
,
probabilities
2300
x1424
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2035
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2680
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x214
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1463
952D
I'm Feeling Lucky!
probabilities
1800
x2204
949F
Astronomy
geometry
,
probabilities
3300
x40
935D
Fafa and Ancient Alphabet
math
,
probabilities
1900
x2335
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