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Before contest
Codeforces Round #717 (Div. 2)
17:15:01
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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
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x12266
1508E
Tree Calendar
brute force
,
constructive algorithms
,
dfs and similar
,
sortings
,
trees
x99
1508C
Complete the MST
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
x579
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x502
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x326
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x86
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x673
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x1695
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x237
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x1367
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x349
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x819
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x97
1481F
AB Tree
dp
,
greedy
,
trees
3100
x184
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x388
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x813
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x8191
1464F
My Beautiful Madness
data structures
,
trees
3500
x54
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x958
1458F
Range Diameter Sum
data structures
,
trees
3500
x67
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x3673
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1408
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x166
1450G
Communism
bitmasks
,
dp
,
trees
3500
x77
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x2160
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x59
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x218
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x60
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x267
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x503
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x7740
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4041
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x92
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x31
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x988
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x2521
1413F
Roads and Ramen
data structures
,
trees
2800
x415
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x483
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1405
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x6762
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x5313
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x253
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x131
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x6311
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x1647
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x4320
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x187
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x352
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x902
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x212
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x4672
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x7167
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x328
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x574
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x1511
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x275
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x7952
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x237
1380E
Merging Towers
data structures
,
dsu
,
implementation
,
trees
2300
x1350
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x196
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1067
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x895
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x996
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x6490
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x162
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x2877
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x4889
1363C
Game On Leaves
games
,
trees
1600
x11937
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x244
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x215
1344E
Train Tracks
data structures
,
trees
3100
x95
1340D
Nastya and Time Machine
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2600
x546
1338D
Nested Rubber Bands
constructive algorithms
,
dfs and similar
,
dp
,
math
,
trees
2700
x507
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x6209
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x100
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x12833
1332F
Independent Set
dfs and similar
,
dp
,
trees
2500
x750
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x5468
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x33
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x9866
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x4916
1322F
Assigning Fares
dp
,
trees
3500
x36
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x347
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x1433
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x290
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x3668
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x3320
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x378
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x231
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x164
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x1963
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x3446
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x549
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1388
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x3296
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1192
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x5124
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x177
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1033
1280D
Miss Punyverse
dp
,
greedy
,
trees
2500
x473
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