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Before contest
Educational Codeforces Round 131 (Rated for Div. 2)
3 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
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Status
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Custom test
Problems
#
Name
1639K
Treasure Hunt
graphs
,
interactive
1639J
Treasure Hunt
graphs
,
interactive
1639I
Treasure Hunt
graphs
,
interactive
1639H
Treasure Hunt
graphs
,
interactive
1639G
Treasure Hunt
graphs
,
interactive
1639F
Treasure Hunt
graphs
,
interactive
1639E
Treasure Hunt
graphs
,
interactive
1639D
Treasure Hunt
graphs
,
interactive
1639C
Treasure Hunt
graphs
,
interactive
1639B
Treasure Hunt
graphs
,
interactive
1639A
Treasure Hunt
graphs
,
interactive
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x40
1578I
Interactive Rays
geometry
,
interactive
3300
x43
1442F
Differentiating Games
games
,
interactive
3400
x56
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x62
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x74
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x77
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x86
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x91
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x92
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x93
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x100
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x106
1423M
Milutin's Plums
interactive
2800
x106
1299E
So Mean
interactive
,
math
3400
x106
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x116
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x120
1145G
AI Takeover
interactive
x122
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x123
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x135
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x144
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x151
1147F
Zigzag Game
games
,
interactive
3500
x159
1482G
Vabank
binary search
,
interactive
3200
x170
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x190
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x191
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x199
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x207
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x219
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x234
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x239
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x243
1147E
Rainbow Coins
interactive
3000
x255
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x256
1142E
Pink Floyd
graphs
,
interactive
3200
x266
1007C
Guess two numbers
binary search
,
interactive
3000
x274
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x283
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x295
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x296
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x301
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x317
1089C
Cactus Search
interactive
2500
x325
1028G
Guess the number
dp
,
interactive
3000
x339
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x352
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x352
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x363
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x371
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x371
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x376
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x385
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x393
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x396
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x399
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x474
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x519
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x526
1061F
Lost Root
interactive
,
probabilities
2400
x538
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x553
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x559
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x593
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x618
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x638
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x720
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x722
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x731
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x764
1599H
Hidden Fortress
interactive
,
math
2100
x785
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x838
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x851
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x943
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x993
1205C
Palindromic Paths
implementation
,
interactive
2400
x1001
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1006
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1020
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1031
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1031
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1070
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1094
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1114
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1150
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1171
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1237
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1270
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1296
809B
Glad to see you!
binary search
,
interactive
2200
x1305
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1310
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1334
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1340
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1455
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1515
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