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Before contest
Codeforces Round #697 (Div. 3)
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
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x773
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
interactive
3400
x64
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x2713
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x1770
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x235
1442F
Differentiating Games
games
,
interactive
3400
x30
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x27
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x23
1423M
Milutin's Plums
interactive
2800
x74
1425F
Flamingoes of Mystery
interactive
1400
x2255
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x999
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x7569
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x500
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x198
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x2496
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x145
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x254
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1349
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x856
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x961
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x603
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x674
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x489
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3029
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x404
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x506
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x38
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x332
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x3583
1299E
So Mean
interactive
,
math
3400
x71
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x210
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x288
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x126
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x376
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x839
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x3506
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x1532
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x91
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x459
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x914
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x3905
1205C
Palindromic Paths
implementation
,
interactive
2400
x877
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x84
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x74
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x75
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x830
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x6661
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x60
1147F
Zigzag Game
games
,
interactive
3500
x95
1147E
Rainbow Coins
interactive
3000
x204
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1001
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x2573
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1152
1145G
AI Takeover
interactive
x96
1142E
Pink Floyd
graphs
,
interactive
3200
x146
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x729
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x219
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1090
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x1968
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x2517
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x643
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x109
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x291
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x139
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x1940
1089C
Cactus Search
interactive
2500
x273
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x1814
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x404
1061F
Lost Root
interactive
,
probabilities
2400
x416
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1256
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x2119
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x316
1033D
Divisors
interactive
,
math
,
number theory
2000
x1661
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x1636
1028G
Guess the number
dp
,
interactive
3000
x274
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1509
1019B
The hat
binary search
,
interactive
2000
x1460
1010B
Rocket
binary search
,
interactive
1800
x3769
1007C
Guess two numbers
binary search
,
interactive
3000
x221
952B
A Map of the Cat
brute force
,
interactive
1900
x1619
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x298
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x1567
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1004
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1321
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x1579
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x701
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1167
809B
Glad to see you!
binary search
,
interactive
2200
x1165
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x77
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x168
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x7036
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x74
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x333
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x218
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1442
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x1876
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x3506
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1225
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x704
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x7652
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