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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
36:27:56
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Difficulty:
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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
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1946
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x447
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x962
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x73
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
1444C
Team-Building
data structures
,
dfs and similar
,
dsu
,
graphs
2500
x1432
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x545
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1511
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5801
1433D
Districts Connection
constructive algorithms
,
dfs and similar
1200
x21472
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x597
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x471
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7724
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1593
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9737
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x975
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7027
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x356
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x195
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8794
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x750
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2186
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5622
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x316
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1772
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3759
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x434
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1416
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x372
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6083
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9293
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x783
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x663
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1280
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6665
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x441
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5357
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1621
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1196
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1327
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x591
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2011
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5105
1365D
Solve The Maze
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
shortest paths
1700
x15888
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x3992
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6441
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x612
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1362
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x3047
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x16032
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4207
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x759
1344C
Quantifier Question
dfs and similar
,
dp
,
graphs
,
math
2600
x1633
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5745
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x790
1340C
Nastya and Unexpected Guest
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x2005
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x790
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x7987
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19042
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1945
1332F
Independent Set
dfs and similar
,
dp
,
trees
2500
x971
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15427
1331E
Jordan Smiley
*special problem
,
dfs and similar
,
geometry
,
implementation
x1195
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x8670
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3006
1325F
Ehab's Last Theorem
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x1651
1325E
Ehab's REAL Number Theory Problem
brute force
,
dfs and similar
,
graphs
,
number theory
,
shortest paths
2600
x1787
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x12761
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x8861
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26634
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x611
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x5734
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3145
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x741
1311B
WeirdSort
dfs and similar
,
sortings
1200
x18365
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x560
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x5925
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4687
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4811
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x11709
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1030
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x407
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x192
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2606
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5239
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1821
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1472
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4315
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7225
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x935
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2422
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1685
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4602
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x5693
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2005
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x324
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x830
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13119
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x258
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x8752
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