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Educational Codeforces Round 165 (Rated for Div. 2)
25:45:57
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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
952A
Quirky Quantifiers
math
800
x11103
1013A
Piles With Stones
math
800
x10821
1043A
Elections
implementation
,
math
800
x10701
669A
Little Artem and Presents
math
800
x10531
624A
Save Luke
math
800
x10161
899A
Splitting in Teams
constructive algorithms
,
greedy
,
math
800
x10074
747A
Display Size
brute force
,
math
800
x10030
851A
Arpa and a research in Mexican wave
implementation
,
math
800
x9494
965A
Paper Airplanes
math
800
x9342
964A
Splits
math
800
x9091
1725A
Accumulation of Dominoes
math
800
x9056
748A
Santa Claus and a Place in a Class
implementation
,
math
800
x8642
1075A
The King's Race
implementation
,
math
800
x8326
760A
Petr and a calendar
implementation
,
math
800
x7732
818A
Diplomas and Certificates
implementation
,
math
800
x6776
1769A
Узкая дорога
*special problem
,
math
800
x1894
318A
Even Odds
math
900
x105814
1475A
Odd Divisor
math
,
number theory
900
x54890
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
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x44183
1624B
Make AP
implementation
,
math
900
x34103
1337B
Kana and Dragon Quest game
greedy
,
implementation
,
math
900
x33006
1462C
Unique Number
brute force
,
greedy
,
math
900
x31158
1339A
Filling Diamonds
brute force
,
dp
,
implementation
,
math
900
x31019
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29529
1296B
Food Buying
math
900
x29323
1714A
Everyone Loves to Sleep
implementation
,
math
900
x28401
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x28381
1341A
Nastya and Rice
math
900
x28246
1878C
Vasilije in Cacak
math
900
x28161
1537B
Bad Boy
constructive algorithms
,
greedy
,
math
900
x27862
1555A
PizzaForces
brute force
,
math
900
x27211
1921C
Sending Messages
greedy
,
math
900
x27103
1401A
Distance and Axis
constructive algorithms
,
math
900
x26870
1650B
DIV + MOD
math
900
x26769
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x26294
1350A
Orac and Factors
math
900
x25543
1593B
Make it Divisible by 25
dfs and similar
,
dp
,
greedy
,
math
,
math
900
x25091
598A
Tricky Sum
math
900
x24769
1607B
Odd Grasshopper
math
900
x24470
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24422
1613A
Long Comparison
implementation
,
math
900
x23926
1467A
Wizard of Orz
constructive algorithms
,
greedy
,
math
900
x23835
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23602
1881B
Three Threadlets
math
900
x23509
1213A
Chips Moving
math
900
x23470
1326B
Maximums
implementation
,
math
900
x23454
1238A
Prime Subtraction
math
,
number theory
900
x23234
1354A
Alarm Clock
math
900
x23220
1856B
Good Arrays
implementation
,
math
900
x23024
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x22959
1420A
Cubes Sorting
math
,
sortings
900
x22822
1543B
Customising the Track
combinatorics
,
greedy
,
math
900
x22637
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22354
1771A
Hossam and Combinatorics
combinatorics
,
math
,
sortings
900
x21991
1768B
Quick Sort
greedy
,
math
900
x21973
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x21752
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21700
1283B
Candies Division
math
900
x21210
1406A
Subset Mex
greedy
,
implementation
,
math
900
x20921
1845B
Come Together
geometry
,
implementation
,
math
900
x20827
913A
Modular Exponentiation
implementation
,
math
900
x20538
1828B
Permutation Swap
math
,
number theory
900
x20528
1430A
Number of Apartments
brute force
,
constructive algorithms
,
math
900
x20445
1436B
Prime Square
constructive algorithms
,
math
900
x20205
1272A
Three Friends
brute force
,
greedy
,
math
,
sortings
900
x20010
1726A
Mainak and Array
greedy
,
math
900
x19752
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x19353
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x19259
1733B
Rule of League
constructive algorithms
,
math
900
x19257
1945B
Fireworks
math
,
number theory
900
x19160
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19004
1582B
Luntik and Subsequences
combinatorics
,
math
900
x18731
1183B
Equalize Prices
math
900
x17961
1735B
Tea with Tangerines
greedy
,
math
900
x17684
1175A
From Hero to Zero
implementation
,
math
900
x17618
1440B
Sum of Medians
greedy
,
math
900
x17288
1204B
Mislove Has Lost an Array
greedy
,
math
900
x17128
1113A
Sasha and His Trip
dp
,
greedy
,
math
900
x16967
1047B
Cover Points
geometry
,
math
900
x16883
1427A
Avoiding Zero
math
,
sortings
900
x16818
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x16647
1279A
New Year Garland
math
900
x16590
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x16557
1248B
Grow The Tree
greedy
,
math
,
sortings
900
x16451
1351B
Square?
brute force
,
implementation
,
math
900
x16430
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16394
1668B
Social Distance
greedy
,
math
,
sortings
900
x16304
1208A
XORinacci
math
900
x16260
1848A
Vika and Her Friends
games
,
math
900
x16176
496A
Minimum Difficulty
brute force
,
implementation
,
math
900
x16083
1900B
Laura and Operations
dp
,
math
900
x15889
1584C
Two Arrays
greedy
,
math
,
sortings
900
x15840
1610A
Anti Light's Cell Guessing
math
900
x15780
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x15772
1225A
Forgetting Things
math
900
x15498
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15282
1764B
Doremy's Perfect Math Class
math
,
number theory
900
x15228
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