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Before contest
Codeforces Round 941 (Div. 1)
20:29:20
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Before contest
Codeforces Round 941 (Div. 2)
20:29:20
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number theory
combine-tags-by-or
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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
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probabilities
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shortest paths
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ternary search
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Problems
#
Name
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5738
1184A1
Heidi Learns Hashing (Easy)
brute force
,
math
,
number theory
1200
x5817
1848C
Vika and Price Tags
math
,
number theory
1800
x5919
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5988
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x5994
833A
The Meaningless Game
math
,
number theory
1700
x6014
817A
Treasure Hunt
implementation
,
math
,
number theory
1200
x6056
992B
Nastya Studies Informatics
math
,
number theory
1600
x6084
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6129
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6139
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6169
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6191
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6215
284A
Cows and Primitive Roots
implementation
,
math
,
number theory
1400
x6364
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6384
495B
Modular Equations
math
,
number theory
1600
x6445
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6451
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x6511
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6517
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6533
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6577
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6608
59B
Fortune Telling
implementation
,
number theory
1200
x6637
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6648
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x6769
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6784
922C
Cave Painting
brute force
,
number theory
1600
x6835
840A
Leha and Function
combinatorics
,
greedy
,
math
,
number theory
,
sortings
1300
x6953
1331B
Limericks
*special problem
,
math
,
number theory
x6976
267A
Subtractions
math
,
number theory
900
x7120
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7135
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7167
1114C
Trailing Loves (or L'oeufs?)
brute force
,
implementation
,
math
,
number theory
1700
x7244
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7357
1225D
Power Products
hashing
,
math
,
number theory
1800
x7365
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7373
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7410
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7444
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7528
582A
GCD Table
constructive algorithms
,
greedy
,
number theory
1700
x7533
150A
Win or Freeze
games
,
math
,
number theory
1400
x7559
900B
Position in Fraction
math
,
number theory
1300
x7620
474F
Ant colony
data structures
,
math
,
number theory
2100
x7639
1113B
Sasha and Magnetic Machines
greedy
,
number theory
1300
x7658
1195D1
Submarine in the Rybinsk Sea (easy edition)
combinatorics
,
math
,
number theory
1500
x7659
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7672
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x7717
1025B
Weakened Common Divisor
brute force
,
greedy
,
number theory
1600
x7749
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7750
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7782
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7804
858A
k-rounding
brute force
,
math
,
number theory
1100
x7841
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x7863
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x7877
1702F
Equate Multisets
constructive algorithms
,
data structures
,
greedy
,
math
,
number theory
1700
x7909
1209B
Koala and Lights
implementation
,
math
,
number theory
1300
x7933
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8021
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8227
1770C
Koxia and Number Theory
brute force
,
chinese remainder theorem
,
math
,
number theory
1700
x8246
1034A
Enlarge GCD
number theory
1800
x8275
735B
Urbanization
greedy
,
number theory
,
sortings
1100
x8298
1766D
Lucky Chains
math
,
number theory
1600
x8317
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x8329
1062B
Math
greedy
,
math
,
number theory
1500
x8389
1295D
Same GCDs
math
,
number theory
1800
x8402
346A
Alice and Bob
games
,
math
,
number theory
1600
x8441
343A
Rational Resistance
math
,
number theory
1600
x8500
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8511
1228C
Primes and Multiplication
math
,
number theory
1700
x8674
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x8678
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8698
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8800
1612D
X-Magic Pair
math
,
number theory
1600
x8809
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8845
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8893
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8897
1110C
Meaningless Operations
constructive algorithms
,
math
,
number theory
1500
x8907
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x8921
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x8950
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x8961
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9023
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9057
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9076
1469D
Ceil Divisions
brute force
,
constructive algorithms
,
math
,
number theory
1700
x9129
1033B
Square Difference
math
,
number theory
1100
x9140
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9250
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9256
1266C
Diverse Matrix
constructive algorithms
,
greedy
,
math
,
number theory
1400
x9346
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9361
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9470
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x9507
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x9583
1200C
Round Corridor
math
,
number theory
1400
x9586
264B
Good Sequences
dp
,
number theory
1500
x9597
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9621
1091C
New Year and the Sphere Transmission
math
,
number theory
1400
x9775
757B
Bash's Big Day
greedy
,
math
,
number theory
1400
x9791
1005D
Polycarp and Div 3
dp
,
greedy
,
number theory
1500
x9796
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9798
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9862
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