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Before contest
Technocup 2020 - Elimination Round 4
41:39:45
Before contest
Codeforces Round #606 (Div. 1, based on Technocup 2020 Elimination Round 4)
41:39:46
Before contest
Codeforces Round #606 (Div. 2, based on Technocup 2020 Elimination Round 4)
41:39:46
→ Filter Problems
Difficulty:
—
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
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Problems
#
Name
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
1900
x2718
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2500
x512
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2300
x1178
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2800
x112
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x4822
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x3499
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x6121
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x7321
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2100
x1619
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x370
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x436
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2200
x785
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x3013
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
1000
x6661
949C
Data Center Maintenance
dfs and similar
,
graphs
2000
x1276
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x4087
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3300
x90
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x2048
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2500
x582
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x3735
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x5111
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x2246
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1500
x4832
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x3724
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1800
x2291
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x1690
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2600
x759
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2500
x617
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
2100
x997
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
1100
x3497
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1300
x5838
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x213
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x684
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x2646
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x7176
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3000
x63
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x2914
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x2025
883G
Orientation of Edges
dfs and similar
,
graphs
2000
x820
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x1314
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2400
x618
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x105
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x405
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3000
x60
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1400
x6213
847L
Berland SU Computer Network
dfs and similar
,
hashing
,
trees
2500
x223
847I
Noise Level
dfs and similar
2000
x1161
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2600
x245
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2400
x596
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1029
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2400
x382
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2500
x310
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
3000
x138
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x2367
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2900
x212
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x4007
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2400
x520
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x1422
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x6884
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x239
835F
Roads in the Kingdom
dfs and similar
,
dp
,
graphs
,
trees
2400
x381
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x2015
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2600
x387
825E
Minimal Labels
data structures
,
dfs and similar
,
graphs
,
greedy
2400
x1320
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x509
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2700
x178
821D
Okabe and City
dfs and similar
,
graphs
,
shortest paths
2200
x778
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x1468
813C
The Tag Game
dfs and similar
,
graphs
1700
x2688
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x242
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2800
x102
802J
Send the Fool Further! (easy)
dfs and similar
,
trees
1500
x1132
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2000
x1017
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x547
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x67
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2600
x712
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1277
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2800
x146
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x2721
797D
Broken BST
data structures
,
dfs and similar
2200
x935
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x2016
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2500
x1352
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1590
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3300
x49
786A
Berzerk
dfs and similar
,
dp
,
games
2100
x1559
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x1791
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x6705
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1900
x1608
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2200
x1482
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1500
x5283
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1800
x1073
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2600
x578
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
2000
x1702
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x2376
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x3735
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2337
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x971
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2200
x1398
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x1930
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x5748
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