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Problems
#
Name
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x55
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x72
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4308
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3522
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x330
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x931
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7711
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13803
1562D2
Two Hundred Twenty One (hard version)
data structures
,
math
2200
x2081
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6202
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5406
1558F
Strange Sort
data structures
,
sortings
3300
x357
1558D
Top-Notch Insertions
combinatorics
,
data structures
2600
x932
1557D
Ezzat and Grid
data structures
,
dp
,
greedy
2200
x2486
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x310
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2519
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x832
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3878
1553F
Pairwise Modulo
data structures
,
math
2300
x2111
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2800
1552E
Colors and Intervals
constructive algorithms
,
data structures
,
greedy
,
sortings
2300
x1781
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15118
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x635
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x343
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9379
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5566
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13937
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x106
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x80
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x75
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x265
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x839
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x927
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2819
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27258
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5016
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4571
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13648
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x440
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2650
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7521
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x530
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x81
1533E
Chess Team Forming
*special problem
,
binary search
,
data structures
,
greedy
x273
1533C
Sweets
*special problem
,
data structures
,
implementation
x468
1530H
Turing's Award
data structures
,
dp
3400
x145
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2515
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2100
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2360
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x21237
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x21398
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4343
1523H
Hopping Around the Array
data structures
,
dp
3500
x235
1523G
Try Booking
data structures
,
divide and conquer
3200
x404
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8612
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1814
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2916
1520D
Same Differences
data structures
,
hashing
,
math
1200
x43291
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x16112
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x955
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4118
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x230
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x218
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16619
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4111
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1205
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21839
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x704
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x419
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22374
1508F
Optimal Encoding
brute force
,
data structures
3500
x118
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x329
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1431
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4115
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x20881
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x136
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x970
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3212
1500E
Subset Trick
binary search
,
data structures
3300
x213
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x418
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x188
1499C
Minimum Grid Path
brute force
,
data structures
,
greedy
,
math
1500
x12378
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x857
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9276
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16231
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1571
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8067
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x23942
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x282
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x407
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1667
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2505
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4770
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15649
1492B
Card Deck
data structures
,
greedy
,
math
1100
x18162
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x75
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x768
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7739
1490G
Old Floppy Drive
binary search
,
data structures
,
math
1900
x5506
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x15560
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