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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
26:02:35
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Difficulty:
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math
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
#
Name
4A
Watermelon
brute force
,
math
800
x479715
1A
Theatre Square
math
1000
x245107
50A
Domino piling
greedy
,
math
800
x227984
617A
Elephant
math
800
x169450
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x166963
69A
Young Physicist
implementation
,
math
1000
x154570
486A
Calculating Function
implementation
,
math
800
x108967
200B
Drinks
implementation
,
math
800
x107359
318A
Even Odds
math
900
x105814
1328A
Divisibility Problem
math
800
x92942
479A
Expression
brute force
,
math
1000
x88352
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x86863
1335A
Candies and Two Sisters
math
800
x78392
1352A
Sum of Round Numbers
implementation
,
math
800
x71558
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x70928
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x70578
723A
The New Year: Meeting Friends
implementation
,
math
,
sortings
800
x70469
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x69638
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x67034
581A
Vasya the Hipster
implementation
,
math
800
x66923
1154A
Restoring Three Numbers
math
800
x66169
151A
Soft Drinking
implementation
,
math
800
x65502
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x62311
758A
Holiday Of Equality
implementation
,
math
800
x57068
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56852
1475A
Odd Divisor
math
,
number theory
900
x54889
1343B
Balanced Array
constructive algorithms
,
math
800
x53528
9A
Die Roll
math
,
probabilities
800
x52332
1374A
Required Remainder
math
800
x50462
1367B
Even Array
greedy
,
math
800
x50105
1624A
Plus One on the Subset
math
800
x49615
1352C
K-th Not Divisible by n
binary search
,
math
1200
x49557
1433A
Boring Apartments
implementation
,
math
800
x49143
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x48578
1551A
Polycarp and Coins
greedy
,
math
800
x48241
1360A
Minimal Square
greedy
,
math
800
x47904
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x47762
1472B
Fair Division
dp
,
greedy
,
math
800
x47338
1283A
Minutes Before the New Year
math
800
x46385
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46325
1475B
New Year's Number
brute force
,
dp
,
math
900
x46274
1343A
Candies
brute force
,
math
900
x46189
1374B
Multiply by 2, divide by 6
math
900
x45679
1426A
Floor Number
implementation
,
math
800
x45409
1676B
Equal Candies
greedy
,
math
,
sortings
800
x44926
1371A
Magical Sticks
math
800
x44191
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x44183
1294A
Collecting Coins
math
800
x44163
959A
Mahmoud and Ehab and the even-odd game
games
,
math
800
x43972
1873B
Good Kid
brute force
,
greedy
,
math
800
x43897
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x43343
1857A
Array Coloring
greedy
,
math
800
x43163
584A
Olesya and Rodion
math
1000
x42721
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42700
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42420
1542A
Odd Set
math
800
x42114
476A
Dreamoon and Stairs
implementation
,
math
1000
x41010
1472A
Cards for Friends
greedy
,
math
800
x40774
1311A
Add Odd or Subtract Even
greedy
,
implementation
,
math
800
x40616
233A
Perfect Permutation
implementation
,
math
800
x40317
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x39736
1921A
Square
greedy
,
math
800
x39664
1296A
Array with Odd Sum
math
800
x39363
1353A
Most Unstable Array
constructive algorithms
,
greedy
,
math
800
x38909
1729A
Two Elevators
math
800
x38789
1941A
Rudolf and the Ticket
brute force
,
math
800
x38439
1348A
Phoenix and Balance
greedy
,
math
800
x38317
1342A
Road To Zero
greedy
,
math
1000
x38250
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x38239
1358A
Park Lighting
greedy
,
math
800
x38034
1579A
Casimir's String Solitaire
math
,
strings
800
x37740
1385A
Three Pairwise Maximums
math
800
x37502
1899A
Game with Integers
games
,
math
,
number theory
800
x37361
1872A
Two Vessels
brute force
,
greedy
,
math
800
x37141
1327A
Sum of Odd Integers
math
1100
x36780
1368A
C+=
brute force
,
greedy
,
implementation
,
math
800
x36686
124A
The number of positions
math
1000
x36214
1337A
Ichihime and Triangle
constructive algorithms
,
math
800
x35934
1537A
Arithmetic Array
greedy
,
math
800
x35892
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35532
1369A
FashionabLee
geometry
,
math
800
x35529
1593A
Elections
math
800
x35465
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x35240
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x35185
1352B
Same Parity Summands
constructive algorithms
,
math
1200
x35178
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35086
1660A
Vasya and Coins
greedy
,
math
800
x34958
1873C
Target Practice
implementation
,
math
800
x34917
1476A
K-divisible Sum
binary search
,
constructive algorithms
,
greedy
,
math
1000
x34917
1560B
Who's Opposite?
math
800
x34646
1363A
Odd Selection
brute force
,
implementation
,
math
1200
x34307
1955A
Yogurt Sale
math
800
x34285
1353C
Board Moves
math
1000
x34130
1624B
Make AP
implementation
,
math
900
x34103
1858A
Buttons
games
,
greedy
,
math
800
x33983
1950C
Clock Conversion
implementation
,
math
800
x33794
1337B
Kana and Dragon Quest game
greedy
,
implementation
,
math
900
x33006
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x32809
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x32753
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x32183
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