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Problems
#
Name
661G
Hungarian Notation
*special problem
2200
x51
345G
Suffix Subgroup
*special problem
,
strings
2200
x52
72B
INI-file
*special problem
,
implementation
2200
x75
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x76
207C2
Game with Two Trees
2200
x78
98B
Help King
implementation
,
probabilities
,
trees
2200
x114
64G
Path Canonization
*special problem
2200
x116
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x163
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x164
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x186
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x205
926H
Endless Roses Most Beautiful
2200
x207
952G
Puzzling Language
constructive algorithms
2200
x226
802E
Marmots (medium)
math
2200
x237
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x254
45B
School
dp
,
dsu
2200
x266
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x268
105C
Item World
brute force
,
implementation
,
sortings
2200
x270
593C
Beautiful Function
constructive algorithms
,
math
2200
x272
257E
Greedy Elevator
data structures
,
implementation
2200
x275
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x279
120I
Luck is in Numbers
greedy
2200
x302
68C
Synchrophasotron
brute force
2200
x303
819A
Mister B and Boring Game
games
,
greedy
2200
x308
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x315
36C
Bowls
geometry
,
implementation
2200
x323
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x324
47E
Cannon
data structures
,
geometry
,
sortings
2200
x354
153C
Caesar Cipher
*special problem
2200
x361
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x364
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
1970E3
Trails (Hard)
dp
,
matrices
2200
x378
125D
Two progressions
constructive algorithms
,
greedy
2200
x391
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x401
51D
Geometrical problem
implementation
2200
x418
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x420
245G
Suggested Friends
brute force
,
graphs
2200
x423
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x427
42C
Safe cracking
brute force
,
constructive algorithms
2200
x447
305D
Olya and Graph
combinatorics
,
math
2200
x453
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x459
316G2
Good Substrings
string suffix structures
2200
x466
271E
Three Horses
constructive algorithms
,
math
,
number theory
2200
x478
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x488
858E
Tests Renumeration
greedy
,
implementation
2200
x497
409G
On a plane
*special problem
,
geometry
2200
x500
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x520
1424M
Ancient Language
graphs
,
sortings
2200
x521
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x522
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x522
1505I
Mysterious language again, seriously?
*special problem
2200
x538
316C1
Tidying Up
flows
2200
x546
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x560
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x561
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x562
144E
Competition
data structures
,
greedy
2200
x562
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x566
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x569
883A
Automatic Door
implementation
2200
x574
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x583
115C
Plumber
math
2200
x587
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x588
11C
How Many Squares?
implementation
2200
x590
183C
Cyclic Coloring
dfs and similar
2200
x595
1184C2
Heidi and the Turing Test (Medium)
data structures
2200
x597
71D
Solitaire
brute force
,
implementation
2200
x600
219E
Parking Lot
data structures
2200
x602
1906H
Twin Friends
combinatorics
,
dp
2200
x611
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x612
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x615
1575K
Knitting Batik
implementation
,
math
2200
x621
903F
Clear The Matrix
bitmasks
,
dp
2200
x624
440D
Berland Federalization
dp
,
trees
2200
x626
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x630
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x636
1575G
GCD Festival
math
,
number theory
2200
x642
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x650
413E
Maze 2D
data structures
,
divide and conquer
2200
x670
71E
Nuclear Fusion
bitmasks
,
dp
2200
x670
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x680
730D
Running Over The Bridges
greedy
,
implementation
,
math
2200
x680
279D
The Minimum Number of Variables
bitmasks
,
dp
2200
x692
730E
Award Ceremony
greedy
,
implementation
2200
x708
746F
Music in Car
data structures
,
greedy
,
two pointers
2200
x723
509D
Restoring Numbers
constructive algorithms
,
math
2200
x733
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x736
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x740
366E
Dima and Magic Guitar
brute force
,
implementation
,
math
2200
x743
47D
Safe
brute force
2200
x747
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x750
420D
Cup Trick
data structures
2200
x768
1949F
Dating
greedy
,
sortings
,
trees
2200
x775
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x777
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x796
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x805
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x831
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x844
387E
George and Cards
binary search
,
data structures
2200
x849
1938E
Duplicates
2200
x867
575G
Run for beer
dfs and similar
,
shortest paths
2200
x867
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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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