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dfs and similar
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
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x705
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x719
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x751
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x773
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x780
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x983
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1223
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1524
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1642
555E
Case of Computer Network
dfs and similar
,
graphs
,
trees
2800
x2191
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2666
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x181
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x188
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x275
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x326
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x326
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x361
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x400
475E
Strongly Connected City 2
dfs and similar
2700
x403
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x421
1695E
Ambiguous Dominoes
constructive algorithms
,
dfs and similar
,
graphs
2700
x424
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x429
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x453
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x512
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x513
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x538
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x561
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x580
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x585
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x596
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x614
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x650
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x728
1103C
Johnny Solving
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x777
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x806
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x830
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x834
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x928
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x935
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x967
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x1017
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1062
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1246
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1309
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1923
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2034
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x198
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x331
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x346
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x443
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x494
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x497
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x549
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x598
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x621
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x625
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x630
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x735
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x773
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x777
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x789
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x795
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x802
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x848
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x862
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x902
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x910
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1089
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1089
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1180
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1191
700C
Break Up
dfs and similar
,
graphs
2600
x1220
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1432
1344C
Quantifier Question
dfs and similar
,
dp
,
graphs
,
math
2600
x1639
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1686
527E
Data Center Drama
dfs and similar
,
graphs
2600
x1810
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1849
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2108
741C
Arpa’s overnight party and Mehrdad’s silent entering
constructive algorithms
,
dfs and similar
,
graphs
2600
x2374
547D
Mike and Fish
constructive algorithms
,
dfs and similar
,
graphs
2600
x2420
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x122
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x288
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x293
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x388
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x490
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x520
571C
CNF 2
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x611
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x690
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x694
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x771
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x772
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x785
605D
Board Game
data structures
,
dfs and similar
2500
x786
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x789
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x799
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x814
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x821
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x822
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x843
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x850
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