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Before contest
Codeforces Round 937 (Div. 4)
05:50:00
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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
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x417
513D1
Constrained Tree
dfs and similar
2400
x424
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x425
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x425
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x425
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x432
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x433
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x437
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x441
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x441
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x447
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x456
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x461
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x471
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x484
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x485
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x485
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x486
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x486
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x488
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x492
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x492
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x495
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x509
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x516
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x518
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x520
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x527
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x534
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x534
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x535
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x537
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x539
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x541
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x544
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x545
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x547
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x549
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x551
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x560
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x563
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x565
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x567
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x569
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x570
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x571
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x581
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x588
183C
Cyclic Coloring
dfs and similar
2200
x588
1369F
BareLee
dfs and similar
,
dp
,
games
2700
x591
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x597
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x599
267B
Dominoes
dfs and similar
,
graphs
2000
x604
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x606
571C
CNF 2
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x607
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x609
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x611
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x611
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x611
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x611
367D
Sereja and Sets
bitmasks
,
dfs and similar
2400
x613
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x616
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x626
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x627
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x629
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x636
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x641
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x661
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x664
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x667
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x676
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x680
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x681
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x684
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x686
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x686
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x705
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x708
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x710
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x715
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x717
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x719
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x736
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x738
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x741
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x741
1672F2
Checker for Array Shuffling
constructive algorithms
,
dfs and similar
,
graphs
2800
x750
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x750
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x751
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x754
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x759
1758E
Tick, Tock
combinatorics
,
dfs and similar
,
dsu
,
graphs
2500
x764
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x769
1103C
Johnny Solving
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x769
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x770
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x776
1387B2
Village (Maximum)
*special problem
,
dfs and similar
,
trees
2500
x781
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x783
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x783
605D
Board Game
data structures
,
dfs and similar
2500
x783
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