Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Educational Codeforces Round 168 (Rated for Div. 2)
26:23:17
Register now »
→ Filter Problems
Difficulty:
—
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1686B
Odd Subarrays
dp
,
greedy
800
x18108
1686A
Everything Everywhere All But One
greedy
800
x20317
1684B
Z mod X = C
constructive algorithms
,
math
800
x20850
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23700
1682A
Palindromic Indices
greedy
,
strings
800
x19169
1681B
Card Trick
implementation
,
math
800
x19977
1681A
Game with Cards
games
,
greedy
800
x20870
1680B
Robots
implementation
800
x18172
1680A
Minimums and Maximums
brute force
,
math
800
x21411
1678B1
Tokitsukaze and Good 01-String (easy version)
implementation
800
x15820
1678A
Tokitsukaze and All Zero Sequence
implementation
800
x18047
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x29536
1676B
Equal Candies
greedy
,
math
,
sortings
800
x46890
1676A
Lucky?
implementation
800
x61165
1675A
Food for Animals
greedy
,
math
800
x32465
1674B
Dictionary
combinatorics
,
math
800
x26032
1674A
Number Transformation
constructive algorithms
,
math
800
x26043
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x18357
1672B
I love AAAB
constructive algorithms
,
implementation
800
x15725
1672A
Log Chopping
games
,
implementation
,
math
800
x15983
1671A
String Building
implementation
800
x20335
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x15353
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x33845
1669B
Triple
implementation
,
sortings
800
x41698
1669A
Division?
implementation
800
x60231
1668A
Direction Change
implementation
,
math
800
x16237
1665A
GCD vs LCM
constructive algorithms
,
math
800
x23267
1661A
Array Balancing
greedy
,
math
800
x18283
1660B
Vlad and Candies
math
800
x27870
1660A
Vasya and Coins
greedy
,
math
800
x35598
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18500
1658A
Marin and Photoshoot
constructive algorithms
,
implementation
,
math
800
x20233
1657B
XY Sequence
greedy
800
x22718
1657A
Integer Moves
brute force
,
math
800
x23879
1656A
Good Pairs
math
,
sortings
800
x19507
1654B
Prefix Removals
strings
800
x15554
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18527
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x19464
1651A
Playoff
implementation
800
x25536
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x34374
1649A
Game
implementation
800
x15460
1647A
Madoka and Math Dad
implementation
,
math
800
x22655
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x21035
1646A
Square Counting
math
800
x24137
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20586
1644A
Doors and Keys
implementation
800
x27163
1642A
Hard Way
geometry
800
x16106
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x21369
1637A
Sorting Parts
brute force
,
sortings
800
x22199
1635B
Avoid Local Maximums
greedy
800
x17883
1635A
Min Or Sum
bitmasks
,
greedy
800
x22649
1634A
Reverse and Concatenate
greedy
,
strings
800
x23778
1633B
Minority
greedy
800
x27574
1633A
Div. 7
brute force
800
x32583
1632A
ABC
implementation
800
x29228
1631A
Min Max Swap
greedy
800
x28898
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x23210
1629A
Download More RAM
brute force
,
greedy
,
sortings
800
x28810
1627A
Not Shading
constructive algorithms
,
implementation
800
x23921
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x28595
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x17102
1624A
Plus One on the Subset
math
800
x50965
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x19980
1622A
Construct a Rectangle
geometry
,
math
800
x29798
1621A
Stable Arrangement of Rooks
constructive algorithms
800
x23680
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21428
1619B
Squares and Cubes
implementation
,
math
800
x30519
1619A
Square String?
implementation
,
strings
800
x50116
1618B
Missing Bigram
implementation
800
x22476
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x32024
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16198
1616A
Integer Diversity
implementation
800
x22571
1615A
Closing The Gap
greedy
,
math
800
x20645
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23162
1612A
Distance
brute force
,
constructive algorithms
800
x17588
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x29125
1611A
Make Even
constructive algorithms
,
math
800
x31130
1608A
Find Array
constructive algorithms
,
math
800
x18944
1607A
Linear Keyboard
implementation
,
strings
800
x36701
1605A
A.M. Deviation
math
,
number theory
800
x20505
1604A
Era
greedy
800
x21315
1602A
Two Subsequences
implementation
800
x18889
1598A
Computer Game
brute force
,
dfs and similar
,
dp
,
implementation
800
x23070
1594A
Consecutive Sum Riddle
math
800
x24189
1593A
Elections
math
800
x36226
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x21903
1585A
Life of a Flower
implementation
800
x17647
1584A
Mathematical Addition
math
800
x14801
1583A
Windblume Ode
math
,
number theory
800
x13668
1582A
Luntik and Concerts
math
800
x18402
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13348
1579A
Casimir's String Solitaire
math
,
strings
800
x38391
1574A
Regular Bracket Sequences
constructive algorithms
800
x21633
1573A
Countdown
greedy
800
x21051
1571A
Sequence of Comparisons
*special problem
800
x1274
1569A
Balanced Substring
implementation
800
x25416
1567A
Domino Disaster
implementation
,
strings
800
x29897
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19384
1566A
Median Maximization
binary search
,
greedy
,
math
800
x23015
1562A
The Miracle and the Sleeper
greedy
,
math
800
x25379
←
1
2
3
4
5
6
...
8
9
→
User lists
Name