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Before contest
Educational Codeforces Round 169 (Rated for Div. 2)
16:30:33
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Difficulty:
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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
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14854
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12147
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8301
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15675
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10145
1612D
X-Magic Pair
math
,
number theory
1600
x9038
1612C
Chat Ban
binary search
,
math
1300
x16771
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7175
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9753
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x11249
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7232
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9650
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6573
1607E
Robot on the Board 1
implementation
1600
x9226
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16699
1606C
Banknotes
greedy
,
number theory
1400
x14020
1605C
Dominant Character
brute force
,
greedy
,
implementation
,
strings
1400
x16734
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13369
1603A
Di-visible Confusion
constructive algorithms
,
math
,
number theory
1300
x16476
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x14177
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3852
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8554
1594E1
Rubik's Cube Coloring (easy version)
combinatorics
,
math
1300
x11016
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7367
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x12136
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7827
1585C
Minimize Distance
greedy
1300
x11906
1583C
Omkar and Determination
data structures
,
dp
1700
x6883
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x10396
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3617
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4702
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6571
1579D
Productive Meeting
constructive algorithms
,
graphs
,
greedy
1400
x15794
1579C
Ticks
greedy
,
implementation
1500
x10483
1578H
Higher Order Functions
implementation
,
strings
1700
x2011
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3727
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x16890
1573B
Swaps
greedy
,
math
,
sortings
1400
x14396
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x334
1571B
Epic Novel
*special problem
,
math
1300
x703
1569C
Jury Meeting
combinatorics
,
math
1500
x11904
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x12053
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7800
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6272
1562C
Rings
constructive algorithms
,
math
1500
x13145
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5551
1561C
Deep Down Below
binary search
,
greedy
,
sortings
1300
x14231
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x18039
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13607
1558A
Charmed by the Game
brute force
,
math
1300
x11014
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8528
1556B
Take Your Places!
implementation
1300
x12607
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x12184
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x21430
1555B
Two Tables
brute force
1300
x15932
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12666
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13592
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x14045
1552B
Running for Gold
combinatorics
,
graphs
,
greedy
,
sortings
1500
x15298
1551D1
Domino (easy version)
constructive algorithms
,
math
1700
x7001
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x13143
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15351
1550C
Manhattan Subarrays
brute force
,
geometry
,
greedy
,
implementation
1700
x10084
1548A
Web of Lies
brute force
,
graphs
,
greedy
1400
x16303
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x14265
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16429
1545A
AquaMoon and Strange Sort
sortings
1500
x13795
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7538
1542C
Strange Function
math
,
number theory
1600
x13994
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x22770
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x13848
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11519
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x19007
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x13440
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x28003
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12736
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x12197
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13936
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16356
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12705
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x9110
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8620
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14437
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13392
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x22110
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x22044
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x29963
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8697
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x21161
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x11387
1520E
Arranging The Sheep
greedy
,
math
1400
x20918
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14995
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x16580
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x13274
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11795
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18973
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11298
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16950
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x14857
1513C
Add One
dp
,
matrices
1600
x13754
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