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Before contest
Divide by Zero 2021 and Codeforces Round #714 (Div. 2)
08:13:47
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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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Problems
#
Name
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x159
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x4184
1505A
Is it rated - 2
implementation
,
interactive
x8294
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1219
1482G
Vabank
binary search
,
interactive
3200
x88
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x55
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x219
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x565
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x5122
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x7056
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x7369
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x933
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x84
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x2886
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x1914
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x265
1442F
Differentiating Games
games
,
interactive
3400
x36
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x57
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x28
1423M
Milutin's Plums
interactive
2800
x77
1425F
Flamingoes of Mystery
interactive
1400
x2612
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1044
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x7961
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x528
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x207
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x2572
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x148
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x260
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1426
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x891
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x993
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x625
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x702
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x505
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3087
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x419
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x515
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x38
1336D
Yui and Mahjong Set
constructive algorithms
,
interactive
3200
x337
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x3652
1299E
So Mean
interactive
,
math
3400
x74
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x220
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x297
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x133
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x387
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x857
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x3589
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x1579
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x91
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x467
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x940
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x4090
1205C
Palindromic Paths
implementation
,
interactive
2400
x907
1201E2
Knightmare (hard)
graphs
,
interactive
,
shortest paths
3000
x86
1201E1
Knightmare (easy)
graphs
,
interactive
,
shortest paths
2900
x78
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x77
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x851
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x6948
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x63
1147F
Zigzag Game
games
,
interactive
3500
x111
1147E
Rainbow Coins
interactive
3000
x211
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1030
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x2723
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1165
1145G
AI Takeover
interactive
x102
1142E
Pink Floyd
graphs
,
interactive
3200
x164
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x772
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x228
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1106
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2008
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x2597
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x661
1091G
New Year and the Factorisation Collaboration
interactive
,
math
,
number theory
3200
x110
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x296
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x141
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x1997
1089C
Cactus Search
interactive
2500
x281
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x1851
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x434
1061F
Lost Root
interactive
,
probabilities
2400
x434
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1316
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x2176
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x331
1033D
Divisors
interactive
,
math
,
number theory
2000
x1696
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x1703
1028G
Guess the number
dp
,
interactive
3000
x281
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1543
1019B
The hat
binary search
,
interactive
2000
x1495
1010B
Rocket
binary search
,
interactive
1800
x3920
1007C
Guess two numbers
binary search
,
interactive
3000
x229
952B
A Map of the Cat
brute force
,
interactive
1900
x1661
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x310
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x1618
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1021
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1400
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x1609
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x714
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1213
809B
Glad to see you!
binary search
,
interactive
2200
x1216
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x78
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