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Before contest
Codeforces Round #804 (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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Custom test
Problems
#
Name
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x62
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x85
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x106
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x123
1147F
Zigzag Game
games
,
interactive
3500
x159
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x189
1442F
Differentiating Games
games
,
interactive
3400
x56
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x77
1299E
So Mean
interactive
,
math
3400
x106
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x119
1578I
Interactive Rays
geometry
,
interactive
3300
x43
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x198
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x74
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x92
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x116
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x144
1482G
Vabank
binary search
,
interactive
3200
x169
1142E
Pink Floyd
graphs
,
interactive
3200
x265
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x393
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x135
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x295
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x40
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x100
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x151
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x243
1147E
Rainbow Coins
interactive
3000
x255
1007C
Guess two numbers
binary search
,
interactive
3000
x273
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x300
1028G
Guess the number
dp
,
interactive
3000
x339
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x352
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x384
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x93
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x234
1423M
Milutin's Plums
interactive
2800
x106
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x219
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x283
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x371
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x395
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x474
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x590
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x638
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x719
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x191
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x317
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x352
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x363
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x398
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x719
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x850
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1028
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x207
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x296
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x376
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x519
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x553
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x618
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x730
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1237
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1602
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x239
1089C
Cactus Search
interactive
2500
x323
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x763
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1114
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x256
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x521
1061F
Lost Root
interactive
,
probabilities
2400
x537
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x556
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x838
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x992
1205C
Palindromic Paths
implementation
,
interactive
2400
x1000
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1003
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1020
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1027
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1147
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1332
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1069
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1528
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x1780
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x1801
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2342
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x2494
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x371
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x937
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1171
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1269
809B
Glad to see you!
binary search
,
interactive
2200
x1290
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1295
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1340
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1549
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x1669
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1702
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2142
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2274
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2441
1599H
Hidden Fortress
interactive
,
math
2100
x785
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1310
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1704
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x1921
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x2880
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3409
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