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Problems
#
Name
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x124
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x284
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x344
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x256
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x82
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1156
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3245
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x394
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1562
1912F
Fugitive Frenzy
math
,
probabilities
3100
x105
1874D
Jellyfish and Miku
divide and conquer
,
dp
,
math
,
probabilities
2800
x653
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
2300
x1508
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x692
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2469
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1407
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x317
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x563
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x928
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x902
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2235
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x203
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x940
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x338
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2497
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4342
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x790
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x245
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19294
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x303
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2566
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3228
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x321
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x736
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1482
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x972
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1299
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x368
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x588
1765C
Card Guessing
combinatorics
,
dp
,
probabilities
2600
x368
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x97
1753C
Wish I Knew How to Sort
dp
,
math
,
probabilities
2000
x4179
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1533
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1414
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7316
1737E
Ela Goes Hiking
combinatorics
,
dp
,
math
,
probabilities
2500
x893
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6746
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3552
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5472
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x574
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x423
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x707
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1351
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2391
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x434
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1559
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x436
1578G
Game of Chance
math
,
probabilities
3500
x33
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x44
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x373
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x323
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1177
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5188
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2494
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x752
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x252
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1969
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1533
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2085
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x449
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x188
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x968
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x123
1461C
Random Events
dp
,
math
,
probabilities
1500
x10864
1459A
Red-Blue Shuffle
math
,
probabilities
800
x16813
1454A
Special Permutation
constructive algorithms
,
probabilities
800
x39359
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4083
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x611
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1727
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x673
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x772
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1114
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x627
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x720
1349D
Slime and Biscuits
math
,
probabilities
3200
x820
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x52
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x580
1310D
Tourism
dp
,
graphs
,
probabilities
2300
x1331
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x2361
1295F
Good Contest
combinatorics
,
dp
,
probabilities
2700
x1021
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x557
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x5920
1278F
Cards
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2600
x1752
1267G
Game Relics
math
,
probabilities
3000
x628
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x3326
1264D2
Beautiful Bracket Sequence (hard version)
combinatorics
,
probabilities
2900
x846
1264D1
Beautiful Bracket Sequence (easy version)
combinatorics
,
dp
,
probabilities
2600
x1172
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1122
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x1149
1245E
Hyakugoku and Ladders
dp
,
probabilities
,
shortest paths
2300
x1108
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x168
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