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Before contest
Codeforces Round (Div. 2)
2 days
→ Filter Problems
Difficulty:
—
interactive
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
Submit
Status
Standings
Custom test
Problems
#
Name
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x74
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x82
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x106
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x131
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x156
1147F
Zigzag Game
games
,
interactive
3500
x200
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x264
1442F
Differentiating Games
games
,
interactive
3400
x108
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x131
1299E
So Mean
interactive
,
math
3400
x137
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x143
1578I
Interactive Rays
geometry
,
interactive
3300
x57
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x243
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x272
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x94
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x109
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x138
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x159
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x162
1482G
Vabank
binary search
,
interactive
3200
x205
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x282
1142E
Pink Floyd
graphs
,
interactive
3200
x317
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x411
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x161
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x336
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x46
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x109
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x225
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x266
1147E
Rainbow Coins
interactive
3000
x285
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x322
1007C
Guess two numbers
binary search
,
interactive
3000
x332
1028G
Guess the number
dp
,
interactive
3000
x382
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x385
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x423
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x471
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x105
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x293
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x371
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x488
1423M
Milutin's Plums
interactive
2800
x118
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x226
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x261
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x302
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x345
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x399
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x471
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x532
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x636
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x780
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x848
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x213
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x356
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x398
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x399
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x441
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x442
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x820
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x953
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1108
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x241
1773H
Hot and Cold
binary search
,
interactive
2600
x247
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x276
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x334
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x404
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x599
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x636
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x707
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x781
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1327
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1750
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x256
1089C
Cactus Search
interactive
2500
x354
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x376
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x459
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x481
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x801
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1162
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1210
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x273
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x583
1061F
Lost Root
interactive
,
probabilities
2400
x630
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x676
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1011
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1012
1205C
Palindromic Paths
implementation
,
interactive
2400
x1056
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1086
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1165
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1222
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1233
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1266
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1455
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1519
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1143
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1657
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x1884
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x1978
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2570
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x2806
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