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Codeforces Round 973 (Div. 2)
13:42:44
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Difficulty:
—
shortest paths
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
#
Name
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9798
2000G
Call During the Journey
binary search
,
brute force
,
graphs
,
greedy
,
shortest paths
2100
x2024
1998D
Determine Winning Islands in Race
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
2100
x2975
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5757
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x630
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1213
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16408
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3417
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1275
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2445
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x1045
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x13709
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x939
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x6191
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x3170
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x7508
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x811
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2934
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6820
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1136
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x7285
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2333
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x15965
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1392
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x397
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4362
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1312
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x11636
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3022
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x906
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2195
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1118
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3326
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x310
1776J
Italian Data Centers
graphs
,
shortest paths
2500
x650
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x6222
1765I
Infinite Chess
implementation
,
shortest paths
2800
x188
1759C
Thermostat
greedy
,
math
,
shortest paths
1100
x17569
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1746
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1692
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1489
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1215
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1853
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x3097
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1709
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4473
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5425
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10883
1693C
Keshi in Search of AmShZ
graphs
,
greedy
,
shortest paths
2300
x2565
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4193
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x794
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9584
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1327
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x1029
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17664
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x393
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x5077
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2469
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x871
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x973
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1154
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x585
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2365
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x178
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x864
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x326
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x603
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3807
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7246
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4934
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x369
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x73
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4760
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x355
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x339
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x470
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x669
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x14391
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x13909
1536E
Omkar and Forest
combinatorics
,
graphs
,
math
,
shortest paths
2300
x2396
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1912
1528D
It's a bird! No, it's a plane! No, it's AaParsa!
constructive algorithms
,
graphs
,
shortest paths
2500
x1428
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3685
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7690
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3259
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1794
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3416
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1315
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x376
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2892
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x15897
1482F
Useful Edges
graphs
,
shortest paths
2400
x1526
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3838
1473E
Minimum Path
graphs
,
shortest paths
2400
x3604
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4648
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x1115
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1684
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12703
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4313
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