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Codeforces Round (Div. 2)
4 days
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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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Custom test
Problems
#
Name
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x415
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6468
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x704
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1560
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x956
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1057
628F
Bear and Fair Set
flows
,
graphs
2500
x752
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x236
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x814
623A
Graph and String
constructive algorithms
,
graphs
1800
x4423
615B
Longtail Hedgehog
dp
,
graphs
1600
x5009
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2842
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1638
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x581
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x7494
605B
Lazy Student
constructive algorithms
,
data structures
,
graphs
1700
x3416
601A
The Two Routes
graphs
,
shortest paths
1600
x11678
600F
Edge coloring of bipartite graph
graphs
2800
x761
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10803
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x390
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1221
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2569
590C
Three States
dfs and similar
,
graphs
,
shortest paths
2200
x2724
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3510
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x41610
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1052
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7717
571C
CNF 2
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x645
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6929
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1693
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3965
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1071
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2158
555E
Case of Computer Network
dfs and similar
,
graphs
,
trees
2800
x2326
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x549
553D
Nudist Beach
binary search
,
graphs
,
greedy
2300
x991
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1762
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3317
549B
Looksery Party
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2300
x1486
547D
Mike and Fish
constructive algorithms
,
dfs and similar
,
graphs
2600
x2522
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3517
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4549
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x4060
542E
Playing on Graph
graphs
,
shortest paths
2600
x811
542C
Idempotent functions
constructive algorithms
,
graphs
,
math
2000
x1112
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2348
527E
Data Center Drama
dfs and similar
,
graphs
2600
x1926
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1734
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x16065
521E
Cycling City
dfs and similar
,
graphs
3100
x966
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x49744
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x15758
508D
Tanya and Password
dfs and similar
,
graphs
2500
x3331
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2823
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2086
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12483
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3099
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8799
500A
New Year Transportation
dfs and similar
,
graphs
,
implementation
1000
x51960
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6646
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2271
480D
Parcels
dp
,
graphs
2600
x458
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8380
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1794
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2172
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1413
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x6203
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1623
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x8315
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1074
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13688
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2607
429E
Points and Segments
graphs
3000
x845
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13581
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1244
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x474
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4639
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1401
405E
Graph Cutting
dfs and similar
,
graphs
2300
x1353
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5125
402E
Strictly Positive Matrix
graphs
,
math
2200
x2160
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5802
400D
Dima and Bacteria
dsu
,
graphs
,
shortest paths
2000
x2853
396C
On Changing Tree
data structures
,
graphs
,
trees
x1560
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2461
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x419
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x658
380B
Sereja and Tree
graphs
,
implementation
2400
x531
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2719
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x10076
369D
Valera and Fools
dfs and similar
,
dp
,
graphs
,
shortest paths
2200
x1125
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9680
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1757
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x804
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x920
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x689
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x391
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x763
350B
Resort
graphs
1500
x3102
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x713
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