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Before contest
Codeforces Round 941 (Div. 1)
03:27:57
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Before contest
Codeforces Round 941 (Div. 2)
03:27:56
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trees
combine-tags-by-or
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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
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3766
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5602
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x476
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3377
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5973
690F3
Tree of Life (hard)
trees
3200
x45
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
690C3
Brain Network (hard)
trees
2200
x881
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3572
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x3762
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x6985
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1717
675D
Tree Construction
data structures
,
trees
1800
x3569
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2854
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1376
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1947
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x586
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x579
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x394
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6389
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1480
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x898
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1020
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x966
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x231
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x794
622E
Ants in Leaves
dfs and similar
,
greedy
,
sortings
,
trees
2200
x1974
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x700
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5165
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1685
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2251
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2647
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6910
607D
Power Tree
data structures
,
trees
2600
x554
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1150
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1088
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12601
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x616
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1178
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2353
587C
Duff in the Army
data structures
,
trees
2200
x3672
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x844
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x39608
578F
Mirror Box
matrices
,
trees
3200
x529
576B
Invariance of Tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2100
x1572
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1038
573C
Bear and Drawing
constructive algorithms
,
dfs and similar
,
trees
2300
x952
571D
Campus
binary search
,
data structures
,
dsu
,
trees
3100
x647
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6623
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x600
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x690
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x869
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1052
555E
Case of Computer Network
dfs and similar
,
graphs
,
trees
2800
x2185
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1931
543D
Road Improvement
dp
,
trees
2300
x2533
540E
Infinite Inversions
binary search
,
data structures
,
implementation
,
sortings
,
trees
2100
x2005
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1496
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x371
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2299
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x345
526G
Spiders Evil Plan
greedy
,
trees
3300
x689
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15693
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6161
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1222
512D
Fox And Travelling
dp
,
trees
2900
x929
509F
Progress Monitoring
dp
,
trees
2300
x861
507C
Guess Your Way Out!
implementation
,
math
,
trees
1700
x4273
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x861
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5506
500G
New Year Running
number theory
,
trees
3200
x155
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3062
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x513
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1546
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2116
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3850
482E
ELCA
data structures
,
trees
3200
x175
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x520
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6152
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3092
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x4990
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2055
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1384
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5310
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x103
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5122
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5641
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1976
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x742
442D
Adam and Tree
data structures
,
trees
2600
x950
440D
Berland Federalization
dp
,
trees
2200
x624
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2578
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
431C
k-Tree
dp
,
implementation
,
trees
1600
x24465
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x900
429A
Xor-tree
dfs and similar
,
trees
1300
x9975
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x466
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1124
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x201
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