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Codeforces Round 940 (Div. 2) and CodeCraft-23
44:28:23
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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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Custom test
Problems
#
Name
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
245G
Suggested Friends
brute force
,
graphs
2200
x422
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x456
1424M
Ancient Language
graphs
,
sortings
2200
x519
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x536
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x608
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x611
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x650
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x744
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x910
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1004
575B
Bribes
dfs and similar
,
graphs
,
trees
2200
x1037
369D
Valera and Fools
dfs and similar
,
dp
,
graphs
,
shortest paths
2200
x1084
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1087
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1169
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1180
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1311
821D
Okabe and City
dfs and similar
,
graphs
,
shortest paths
2200
x1338
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1343
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1402
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1422
1227E
Arson In Berland Forest
binary search
,
graphs
,
graphs
,
shortest paths
2200
x1433
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1433
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1453
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1565
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1575
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1599
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1678
1238F
The Maximum Subtree
dfs and similar
,
dp
,
graphs
,
trees
2200
x1679
1763E
Node Pairs
dp
,
graphs
,
math
,
number theory
2200
x1680
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1681
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1720
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1724
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1803
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1811
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1827
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1838
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1880
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1937
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1955
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2057
402E
Strictly Positive Matrix
graphs
,
math
2200
x2075
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2157
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2160
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2208
1498D
Bananas in a Microwave
dfs and similar
,
dp
,
graphs
,
implementation
2200
x2241
1070A
Find a Number
dp
,
graphs
,
number theory
,
shortest paths
2200
x2258
1100E
Andrew and Taxi
binary search
,
dfs and similar
,
graphs
2200
x2279
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2302
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2350
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2352
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2354
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2539
1334E
Divisor Paths
combinatorics
,
graphs
,
greedy
,
math
,
number theory
2200
x2587
590C
Three States
dfs and similar
,
graphs
,
shortest paths
2200
x2602
1037E
Trips
graphs
2200
x2637
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2781
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3017
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x3272
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3461
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3560
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4402
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4603
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x4924
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6609
45H
Road Problem
graphs
2100
x174
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x410
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x559
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x891
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x894
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x945
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1059
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1306
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1307
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1427
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1524
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1528
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1538
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1572
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1589
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1601
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1637
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1639
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1653
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1692
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1713
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1767
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1803
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x1897
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x1932
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2024
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2051
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2103
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2115
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2128
894E
Ralph and Mushrooms
dp
,
graphs
2100
x2131
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2234
702E
Analysis of Pathes in Functional Graph
data structures
,
graphs
2100
x2254
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2276
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2285
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