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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
08:08:22
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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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Custom test
Problems
#
Name
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x253
1526E
Oolimry and Suffix Array
combinatorics
,
constructive algorithms
,
math
2400
x1040
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2381
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x326
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x2021
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4399
1523H
Hopping Around the Array
data structures
,
dp
3500
x238
1523G
Try Booking
data structures
,
divide and conquer
3200
x443
1523F
Favorite Game
bitmasks
,
dp
3300
x416
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1595
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2146
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x654
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1879
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4316
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3620
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2950
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x402
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x815
1517H
Fly Around the World
dp
,
geometry
3500
x68
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x468
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x453
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x961
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x830
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4214
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x251
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x222
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x986
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1729
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3462
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x593
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4180
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1214
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x1438
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5209
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x721
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x424
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2518
1510J
Japanese Game
constructive algorithms
,
math
2700
x516
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x463
1510H
Hard Optimization
dp
3200
x98
1510G
Guide
2100
x1266
1510F
Fiber Shape
2800
x58
1510E
Equilibrium Point /\textbackslash/\textbackslash
2700
x248
1510D
Digits
dp
,
math
,
number theory
2100
x1854
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x211
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x729
1510A
ASCII Automata Art
3100
x152
1508F
Optimal Encoding
brute force
,
data structures
3500
x120
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x331
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x546
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1450
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4168
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3170
1505I
Mysterious language again, seriously?
*special problem
2200
x549
1505H
L BREAK into program
*special problem
2500
x497
1505G
Encoded message
*special problem
,
implementation
2600
x298
1505F
Math
*special problem
,
math
2200
x1485
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x137
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x603
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x988
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3302
1500F
Cupboards Jumps
dp
3500
x342
1500E
Subset Trick
binary search
,
data structures
3300
x216
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x450
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x787
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x2024
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x188
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1277
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1436
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5636
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x872
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1870
1498D
Bananas in a Microwave
dfs and similar
,
dp
,
graphs
,
implementation
2200
x2275
1497E2
Square-Free Division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1596
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1510
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x292
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x412
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1205
1495C
Garden of the Sun
constructive algorithms
,
graphs
2300
x2546
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x335
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1682
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2528
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x384
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x883
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4846
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4516
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1172
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x80
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x789
1491G
Switch and Flip
constructive algorithms
,
graphs
,
math
2800
x755
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x935
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2078
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x35
1488I
Demonic Invasion
*special problem
,
flows
3100
x37
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x58
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x122
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x174
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x212
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x584
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x365
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