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Before contest
Codeforces Round 941 (Div. 1)
27:27:07
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
27:27:07
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math
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2-sat
binary search
bitmasks
brute force
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combinatorics
constructive algorithms
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dfs and similar
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dp
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expression parsing
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geometry
graph matchings
graphs
greedy
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Problems
#
Name
4A
Watermelon
brute force
,
math
800
x479356
1A
Theatre Square
math
1000
x244965
50A
Domino piling
greedy
,
math
800
x227812
617A
Elephant
math
800
x169307
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x166743
69A
Young Physicist
implementation
,
math
1000
x154473
486A
Calculating Function
implementation
,
math
800
x108882
200B
Drinks
implementation
,
math
800
x107288
318A
Even Odds
math
900
x105736
1328A
Divisibility Problem
math
800
x92852
479A
Expression
brute force
,
math
1000
x88307
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x86810
1335A
Candies and Two Sisters
math
800
x78344
1352A
Sum of Round Numbers
implementation
,
math
800
x71479
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x70886
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x70530
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x70374
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x69590
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x66962
581A
Vasya the Hipster
implementation
,
math
800
x66883
1154A
Restoring Three Numbers
math
800
x66131
151A
Soft Drinking
implementation
,
math
800
x65436
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x62275
758A
Holiday Of Equality
implementation
,
math
800
x57023
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56826
1475A
Odd Divisor
math
,
number theory
900
x54836
1343B
Balanced Array
constructive algorithms
,
math
800
x53502
9A
Die Roll
math
,
probabilities
800
x52293
1374A
Required Remainder
math
800
x50433
1367B
Even Array
greedy
,
math
800
x50083
1624A
Plus One on the Subset
math
800
x49593
1352C
K-th Not Divisible by n
binary search
,
math
1200
x49468
1433A
Boring Apartments
implementation
,
math
800
x49117
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x48556
1551A
Polycarp and Coins
greedy
,
math
800
x48202
1360A
Minimal Square
greedy
,
math
800
x47877
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x47734
1472B
Fair Division
dp
,
greedy
,
math
800
x47301
1283A
Minutes Before the New Year
math
800
x46357
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46294
1475B
New Year's Number
brute force
,
dp
,
math
900
x46243
1343A
Candies
brute force
,
math
900
x46170
1374B
Multiply by 2, divide by 6
math
900
x45628
1426A
Floor Number
implementation
,
math
800
x45384
1676B
Equal Candies
greedy
,
math
,
sortings
800
x44884
1371A
Magical Sticks
math
800
x44174
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x44168
1294A
Collecting Coins
math
800
x44140
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x43916
1873B
Good Kid
brute force
,
greedy
,
math
800
x43809
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x43321
1857A
Array Coloring
greedy
,
math
800
x43115
584A
Olesya and Rodion
math
1000
x42695
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42681
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42381
1542A
Odd Set
math
800
x42096
476A
Dreamoon and Stairs
implementation
,
math
1000
x40985
1472A
Cards for Friends
greedy
,
math
800
x40751
1311A
Add Odd or Subtract Even
greedy
,
implementation
,
math
800
x40603
233A
Perfect Permutation
implementation
,
math
800
x40294
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x39710
1921A
Square
greedy
,
math
800
x39630
1296A
Array with Odd Sum
math
800
x39342
1353A
Most Unstable Array
constructive algorithms
,
greedy
,
math
800
x38890
1729A
Two Elevators
math
800
x38766
1941A
Rudolf and the Ticket
brute force
,
math
800
x38372
1348A
Phoenix and Balance
greedy
,
math
800
x38302
1342A
Road To Zero
greedy
,
math
1000
x38228
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x38221
1358A
Park Lighting
greedy
,
math
800
x38023
1579A
Casimir's String Solitaire
math
,
strings
800
x37720
1385A
Three Pairwise Maximums
math
800
x37490
1899A
Game with Integers
games
,
math
,
number theory
800
x37248
1872A
Two Vessels
brute force
,
greedy
,
math
800
x37118
1327A
Sum of Odd Integers
math
1100
x36767
1368A
C+=
brute force
,
greedy
,
implementation
,
math
800
x36664
124A
The number of positions
math
1000
x36201
1337A
Ichihime and Triangle
constructive algorithms
,
math
800
x35917
1537A
Arithmetic Array
greedy
,
math
800
x35871
1369A
FashionabLee
geometry
,
math
800
x35517
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35514
1593A
Elections
math
800
x35439
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x35221
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x35170
1352B
Same Parity Summands
constructive algorithms
,
math
1200
x35159
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35033
1660A
Vasya and Coins
greedy
,
math
800
x34942
1476A
K-divisible Sum
binary search
,
constructive algorithms
,
greedy
,
math
1000
x34890
1873C
Target Practice
implementation
,
math
800
x34830
1560B
Who's Opposite?
math
800
x34632
1363A
Odd Selection
brute force
,
implementation
,
math
1200
x34266
1353C
Board Moves
math
1000
x34120
1624B
Make AP
implementation
,
math
900
x34084
1858A
Buttons
games
,
greedy
,
math
800
x33940
1955A
Yogurt Sale
math
800
x33836
1950C
Clock Conversion
implementation
,
math
800
x33584
1337B
Kana and Dragon Quest game
greedy
,
implementation
,
math
900
x33000
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x32804
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x32721
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x32158
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