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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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Name
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1163
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2043
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x18835
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x13698
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x621
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1213
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x532
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2240
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8384
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4402
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3577
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1332
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2794
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1453
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5509
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1969
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x453
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x1018
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x76
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x130
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1459
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x553
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1580
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5847
1433D
Districts Connection
constructive algorithms
,
dfs and similar
1200
x21765
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x625
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x474
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7769
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1604
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9823
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x983
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7086
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x198
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8864
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x781
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2219
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5683
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x320
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1791
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3768
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x442
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1432
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x380
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6123
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9347
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x799
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x671
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1327
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6811
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x447
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5419
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1642
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1246
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1366
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x596
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2017
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5129
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x16155
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4015
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6484
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x627
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1384
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x3061
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x16254
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4225
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x773
1344C
Quantifier Question
dfs and similar
,
dp
,
graphs
,
math
2600
x1639
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5774
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x802
1340C
Nastya and Unexpected Guest
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x2021
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x831
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8087
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19344
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1988
1332F
Independent Set
dfs and similar
,
dp
,
trees
2500
x976
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15667
1331E
Jordan Smiley
*special problem
,
dfs and similar
,
geometry
,
implementation
x1198
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x8850
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3069
1325F
Ehab's Last Theorem
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x1733
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1849
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x12959
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x9093
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26922
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x665
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5805
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3206
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x789
1311B
WeirdSort
dfs and similar
,
sortings
1200
x18487
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x568
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6030
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4756
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4921
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x11827
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1089
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x418
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x197
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2672
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5353
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