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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
44:23:40
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Difficulty:
—
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
939A
Love Triangle
graphs
800
x24173
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23728
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x20755
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17501
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16894
115A
Party
dfs and similar
,
graphs
,
trees
900
x32742
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13353
1055A
Metro
graphs
900
x10353
500A
New Year Transportation
dfs and similar
,
graphs
,
implementation
1000
x50090
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x20147
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x12915
1472C
Long Jumps
dp
,
graphs
1100
x29725
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18099
1255B
Fridge Lockers
graphs
,
implementation
1100
x11668
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x9846
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x835
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20334
1559C
Mocha and Hiking
constructive algorithms
,
graphs
1200
x19656
1327B
Princesses and Princes
brute force
,
graphs
,
greedy
1200
x18239
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15693
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15043
1428B
Belted Rooms
graphs
,
implementation
1200
x14158
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11662
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x11015
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8648
292B
Network Topology
graphs
,
implementation
1200
x7689
1510K
King's Task
brute force
,
graphs
,
implementation
1200
x5264
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x24364
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x21567
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x16937
330B
Road Construction
constructive algorithms
,
graphs
1300
x16337
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16061
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x15900
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14407
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14339
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x14096
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14072
1711B
Party
brute force
,
graphs
1300
x13086
707B
Bakery
graphs
1300
x12748
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12520
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12477
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x11938
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11608
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x10750
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8258
94B
Friends
graphs
,
implementation
,
math
1300
x4482
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x47756
1475C
Ball in Berland
combinatorics
,
graphs
,
math
1400
x19912
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x16934
1548A
Web of Lies
brute force
,
graphs
,
greedy
1400
x16000
1579D
Productive Meeting
constructive algorithms
,
graphs
,
greedy
1400
x15360
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x13661
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13479
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13174
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12369
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12101
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12066
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x11190
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9544
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9481
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9144
1764C
Doremy's City Construction
graphs
,
greedy
1400
x9034
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8222
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4914
24A
Ring road
graphs
1400
x4753
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4605
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4265
8B
Obsession with Robots
constructive algorithms
,
graphs
,
implementation
1400
x4064
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x39610
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19152
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x18089
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x15848
1552B
Running for Gold
combinatorics
,
graphs
,
greedy
,
sortings
1500
x14944
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14594
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14530
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13885
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x13733
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x13663
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13223
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11989
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x11963
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10764
1851E
Nastya and Potions
dfs and similar
,
dp
,
graphs
,
sortings
1500
x9369
1169B
Pairs
graphs
,
implementation
1500
x9296
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8511
744A
Hongcow Builds A Nation
dfs and similar
,
graphs
1500
x7862
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7597
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7071
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x6739
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x6080
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5685
1147A
Hide and Seek
graphs
1500
x5139
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3572
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3516
350B
Resort
graphs
1500
x3058
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2524
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2441
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2426
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x15036
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12284
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