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Codeforces Global Round 26
03:02:25
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Difficulty:
—
data structures
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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Problems
#
Name
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1651
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x547
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3038
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x719
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2204
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18041
1807D
Odd Queries
data structures
,
implementation
900
x29408
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2710
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1543
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12122
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x194
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x353
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x435
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2085
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3265
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5903
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21995
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21534
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22564
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2312
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11409
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x16027
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x335
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1206
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3742
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4032
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1945
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11653
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1026
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1307
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x942
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18529
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5966
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11684
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18559
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2503
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x149
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x203
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x400
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1543
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x418
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2042
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1273
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1397
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1320
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7581
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11944
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x832
1776E
Crossing the Railways
data structures
,
dp
3500
x63
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x395
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x645
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1025
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x987
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2621
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3697
1767F
Two Subtrees
data structures
,
trees
3100
x254
1767C
Count Binary Strings
data structures
,
dp
2100
x2538
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19766
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1145
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x564
1764H
Doremy's Paint 2
data structures
3400
x170
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x421
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14103
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x568
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19478
1760C
Advantage
data structures
,
implementation
,
sortings
800
x35470
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4290
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3751
1758F
Decent Division
constructive algorithms
,
data structures
3000
x160
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x74
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1369
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x481
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13528
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1748
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10617
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4525
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x90
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1572
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x248
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1435
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2257
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x106
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x204
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4151
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7782
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x516
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4929
1738H
Palindrome Addicts
data structures
,
strings
3300
x231
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3360
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x109
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1247
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14625
1735F
Pebbles and Beads
data structures
,
geometry
2900
x219
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1026
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5344
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6091
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x417
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1373
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8363
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6830
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