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Before contest
Codeforces Round 952 (Div. 4)
03:08:13
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Difficulty:
—
trees
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
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x310
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x131
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1895
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4214
1413F
Roads and Ramen
data structures
,
trees
2800
x712
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x934
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1887
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9879
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7117
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x361
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x200
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8903
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2226
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5705
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x326
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x812
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1457
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x382
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6149
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9399
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x816
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1343
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2265
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x564
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10265
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x454
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1922
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x404
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1682
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1254
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1376
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8302
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x404
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4028
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6528
1363C
Game On Leaves
games
,
trees
1600
x17989
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x636
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x308
1344E
Train Tracks
data structures
,
trees
3100
x319
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x849
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x863
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8157
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x201
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19539
1332F
Independent Set
dfs and similar
,
dp
,
trees
2500
x980
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x8933
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x72
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x13064
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x9254
1322F
Assigning Fares
dp
,
trees
3500
x91
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x676
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x2157
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x571
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4766
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4947
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x740
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x422
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x203
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2716
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5505
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x780
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1966
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4589
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1743
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7503
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x315
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1666
1280D
Miss Punyverse
dp
,
greedy
,
trees
2500
x927
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2490
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1751
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3760
1276D
Tree Elimination
dp
,
trees
2900
x489
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x847
1260F
Colored Tree
data structures
,
trees
2700
x487
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x262
1254D
Tree Queries
data structures
,
probabilities
,
trees
2700
x1171
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1591
1252F
Regular Forestation
hashing
,
trees
2400
x888
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x330
1252B
Cleaning Robots
dp
,
trees
2300
x505
1249F
Maximum Weight Subset
dp
,
trees
2200
x2251
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x7134
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7390
1238F
The Maximum Subtree
dfs and similar
,
dp
,
graphs
,
trees
2200
x1829
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x420
1225F
Tree Factory
constructive algorithms
,
greedy
,
trees
2500
x868
1223E
Paint the Tree
dp
,
sortings
,
trees
2100
x2529
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2689
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x557
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x378
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x2657
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6859
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x42
1211G
King's Path
*special problem
,
math
,
trees
2500
x67
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x3212
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1109
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x145
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x974
1205D
Almost All
constructive algorithms
,
trees
2700
x627
1193B
Magic Tree
*special problem
,
data structures
,
dp
,
trees
x420
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