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Codeforces Round 940 (Div. 2)
4 days
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*has extra registration
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Difficulty:
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graphs
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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Status
Standings
Custom test
Problems
#
Name
590C
Three States
dfs and similar
,
graphs
,
shortest paths
2200
x2601
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3480
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x39483
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1037
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7580
571C
CNF 2
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x608
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6606
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1599
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3910
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1044
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2128
555E
Case of Computer Network
dfs and similar
,
graphs
,
trees
2800
x2172
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x526
553D
Nudist Beach
binary search
,
graphs
,
greedy
2300
x970
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1724
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3233
549B
Looksery Party
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2300
x1473
547D
Mike and Fish
constructive algorithms
,
dfs and similar
,
graphs
2600
x2404
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3433
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4367
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x3824
542E
Playing on Graph
graphs
,
shortest paths
2600
x805
542C
Idempotent functions
constructive algorithms
,
graphs
,
math
2000
x1093
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2297
527E
Data Center Drama
dfs and similar
,
graphs
2600
x1798
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1629
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15669
521E
Cycling City
dfs and similar
,
graphs
3100
x913
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x47607
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x14953
508D
Tanya and Password
dfs and similar
,
graphs
2500
x3065
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2588
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2011
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x11984
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3026
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8672
500A
New Year Transportation
dfs and similar
,
graphs
,
implementation
1000
x49936
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6527
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2106
480D
Parcels
dp
,
graphs
2600
x450
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8201
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1759
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2050
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1275
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x5900
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1564
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x7951
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1057
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13456
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2577
429E
Points and Segments
graphs
3000
x825
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x12872
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1189
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x462
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4601
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1386
405E
Graph Cutting
dfs and similar
,
graphs
2300
x1319
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x4986
402E
Strictly Positive Matrix
graphs
,
math
2200
x2074
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5663
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2788
396C
On Changing Tree
data structures
,
graphs
,
trees
x1518
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2430
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x409
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x649
380B
Sereja and Tree
graphs
,
implementation
2400
x525
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2640
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x9820
369D
Valera and Fools
dfs and similar
,
dp
,
graphs
,
shortest paths
2200
x1083
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9358
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1697
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x792
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x891
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x673
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x382
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x744
350B
Resort
graphs
1500
x3055
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x677
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x75
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8637
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x668
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5377
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8111
332D
Theft of Blueprints
graphs
,
math
2400
x380
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x161
331D2
Escaping on Beaveractor
graphs
2600
x125
330B
Road Construction
constructive algorithms
,
graphs
1300
x16308
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2184
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x741
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x330
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x358
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7064
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x486
311C
Fetch the Treasure
brute force
,
data structures
,
graphs
,
shortest paths
2500
x474
303C
Minimum Modular
brute force
,
graphs
,
math
,
number theory
2400
x846
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2103
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6065
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1652
295B
Greg and Graph
dp
,
graphs
,
shortest paths
1700
x13025
292B
Network Topology
graphs
,
implementation
1200
x7661
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