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Before contest
Codeforces Round 973 (Div. 2)
13:24:40
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Difficulty:
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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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Custom test
Problems
#
Name
512D
Fox And Travelling
dp
,
trees
2900
x966
509F
Progress Monitoring
dp
,
trees
2300
x1063
507C
Guess Your Way Out!
implementation
,
math
,
trees
1700
x4320
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x908
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5639
500G
New Year Running
number theory
,
trees
3200
x157
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3111
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x524
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1677
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2319
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3964
482E
ELCA
data structures
,
trees
3200
x176
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x531
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6432
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3297
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5378
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2214
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1597
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5591
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x107
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5707
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5928
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1994
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x763
442D
Adam and Tree
data structures
,
trees
2600
x986
440D
Berland Federalization
dp
,
trees
2200
x678
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2623
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x260
431C
k-Tree
dp
,
implementation
,
trees
1600
x25464
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x940
429A
Xor-tree
dfs and similar
,
trees
1300
x10286
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x478
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x682
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1165
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x210
396C
On Changing Tree
data structures
,
graphs
,
trees
x1579
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6403
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x669
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2257
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6693
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x862
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x964
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5611
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9917
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x441
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2076
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x720
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5745
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x8308
339D
Xenia and Bit Operations
data structures
,
trees
1700
x25381
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1018
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x6067
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x175
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x7196
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x495
294E
Shaass the Great
dp
,
trees
2300
x930
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1401
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1536
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x751
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3572
280C
Game on Tree
implementation
,
math
,
probabilities
,
trees
2200
x3950
277E
Binary Tree on Plane
flows
,
trees
2400
x1277
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1596
274B
Zero Tree
dfs and similar
,
dp
,
greedy
,
trees
1800
x4996
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1535
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1091
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x170
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1229
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x561
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1834
226E
Noble Knight's Path
data structures
,
trees
2900
x457
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x9289
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x322
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1722
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6582
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x957
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3987
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x830
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x7146
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1138
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1634
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1695
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x14663
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x481
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x840
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x716
120F
Spiders
dp
,
greedy
,
trees
1400
x3570
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x323
115A
Party
dfs and similar
,
graphs
,
trees
900
x34310
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3502
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x682
98B
Help King
implementation
,
probabilities
,
trees
2200
x122
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x381
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x882
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x712
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x535
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x340
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x998
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1580
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1789
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