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Problems
#
Name
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x286
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x256
64I
Sort the Table
*special problem
,
sortings
2400
x84
1375E
Inversion SwapSort
constructive algorithms
,
greedy
,
sortings
2500
x2774
1209E2
Rotate Columns (hard version)
bitmasks
,
dp
,
greedy
,
sortings
2500
x1853
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1486
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1390
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1357
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1339
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1257
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1246
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1201
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x1095
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1070
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1022
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x982
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x923
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x901
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x856
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x854
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x816
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x777
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x775
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x759
15D
Map
data structures
,
implementation
,
sortings
2500
x717
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x695
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x653
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x515
912C
Perun, Ult!
brute force
,
greedy
,
sortings
2500
x509
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x505
681E
Runaway to a Shadow
geometry
,
sortings
2500
x454
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x453
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x346
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x337
887F
Row of Models
greedy
,
sortings
2500
x161
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1089
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x988
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x968
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x946
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x932
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x928
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x920
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x837
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x824
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x731
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x725
173E
Camping Groups
data structures
,
sortings
2600
x535
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x477
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x419
286D
Tourists
data structures
,
sortings
2600
x371
140F
New Year Snowflake
geometry
,
sortings
2600
x360
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1382
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x807
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x768
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x626
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x586
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x561
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x472
1214F
Employment
greedy
,
sortings
2700
x423
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x399
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x398
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x390
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x335
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x285
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2693
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1054
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x807
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x640
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x568
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x541
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x423
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x369
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x162
48F
Snow sellers
greedy
,
sortings
2800
x133
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x414
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x329
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x268
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x265
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x206
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x104
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2055
559E
Gerald and Path
dp
,
sortings
3000
x857
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x530
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x458
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x454
773E
Blog Post Rating
data structures
,
sortings
3000
x318
778E
Selling Numbers
dp
,
sortings
3000
x301
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x265
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x264
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x530
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x443
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x329
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x327
720D
Slalom
data structures
,
dp
,
sortings
3100
x224
528E
Triangles 3000
geometry
,
sortings
3100
x214
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x179
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x120
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x100
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