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Name
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2897
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x10948
1520E
Arranging The Sheep
greedy
,
math
1400
x19998
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42771
1520C
Not Adjacent Matrix
constructive algorithms
1000
x30665
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42910
1520A
Do Not Be Distracted!
brute force
,
implementation
800
x49746
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x388
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x807
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14601
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x15998
1519B
The Cake Is a Lie
dp
,
math
800
x29798
1519A
Red and Blue Beans
math
800
x28314
1517H
Fly Around the World
dp
,
geometry
3500
x64
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x412
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x441
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x945
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7336
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x13069
1517B
Morning Jogging
constructive algorithms
,
greedy
,
sortings
1200
x13051
1517A
Sum of 2050
greedy
,
math
800
x25111
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x811
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4097
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11528
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18125
1516A
Tit for Tat
greedy
800
x23147
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x225
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x212
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x937
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1687
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3372
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11164
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16539
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24177
1515A
Phoenix and Gold
constructive algorithms
,
greedy
,
math
800
x20016
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x585
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4095
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x14329
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x22859
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23805
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1201
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x1411
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x5053
1513C
Add One
dp
,
matrices
1600
x13245
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x13782
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x19186
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7813
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x5938
1512E
Permutation by Sum
brute force
,
greedy
,
math
1600
x10018
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21717
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19468
1512B
Almost Rectangle
implementation
800
x25023
1512A
Spy Detected!
brute force
,
implementation
800
x60084
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x701
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x418
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2463
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11059
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22208
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21985
1511A
Review Site
greedy
800
x27170
1510K
King's Task
brute force
,
graphs
,
implementation
1200
x5277
1510J
Japanese Game
constructive algorithms
,
math
2700
x506
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x449
1510H
Hard Optimization
dp
3200
x97
1510G
Guide
2100
x1258
1510F
Fiber Shape
2800
x57
1510E
Equilibrium Point /\textbackslash/\textbackslash
2700
x241
1510D
Digits
dp
,
math
,
number theory
2100
x1801
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x205
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x712
1510A
ASCII Automata Art
3100
x149
1509C
The Sports Festival
dp
,
greedy
1800
x11830
1509B
TMT Document
greedy
1100
x21131
1509A
Average Height
constructive algorithms
800
x25716
1508F
Optimal Encoding
brute force
,
data structures
3500
x117
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x327
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x530
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1424
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3843
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6013
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4097
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3103
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x12611
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x20750
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x23429
1506B
Partial Replacement
greedy
,
implementation
1100
x19906
1506A
Strange Table
math
800
x30122
1505I
Mysterious language again, seriously?
*special problem
2200
x538
1505H
L BREAK into program
*special problem
2500
x484
1505G
Encoded message
*special problem
,
implementation
2600
x292
1505F
Math
*special problem
,
math
2200
x1471
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1721
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x739
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6302
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6005
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x14017
1504B
Flip the Bits
constructive algorithms
,
greedy
,
implementation
,
math
1200
x17307
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21410
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x134
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x592
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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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