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Before contest
Codeforces Round 948 (Div. 2)
03:04:34
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Difficulty:
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dfs and similar
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
553C
Love Triangles
dfs and similar
,
dsu
,
graphs
2200
x1737
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1744
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1756
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1773
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1822
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1844
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1881
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1890
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1940
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1943
1178F1
Short Colorful Strip
combinatorics
,
dfs and similar
,
dp
2200
x1990
622E
Ants in Leaves
dfs and similar
,
greedy
,
sortings
,
trees
2200
x1991
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x2007
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2096
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2165
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2174
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2222
1498D
Bananas in a Microwave
dfs and similar
,
dp
,
graphs
,
implementation
2200
x2252
1100E
Andrew and Taxi
binary search
,
dfs and similar
,
graphs
2200
x2297
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2360
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2364
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2373
505D
Mr. Kitayuta's Technology
dfs and similar
2200
x2429
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2495
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2573
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2607
590C
Three States
dfs and similar
,
graphs
,
shortest paths
2200
x2678
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2700
1327D
Infinite Path
brute force
,
dfs and similar
,
graphs
,
math
,
number theory
2200
x3076
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3209
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x3294
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3316
1520G
To Go Or Not To Go?
brute force
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x3521
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3588
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3706
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6238
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6716
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x74
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x488
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x551
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x572
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x672
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x701
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x896
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x902
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x950
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x977
730C
Bulmart
binary search
,
dfs and similar
2100
x1025
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1030
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1082
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1179
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1386
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1526
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1553
576B
Invariance of Tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2100
x1573
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1618
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1648
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1692
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1700
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1740
797D
Broken BST
data structures
,
dfs and similar
2100
x1757
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1809
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1852
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x1921
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2046
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2064
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2157
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2231
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2246
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2246
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2289
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2300
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2344
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2361
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2462
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2478
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2604
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2613
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2633
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2680
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2790
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2799
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2807
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2845
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2858
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2877
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2993
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3033
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x3066
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3166
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3247
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3749
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3776
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3859
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3959
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3989
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4024
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4214
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x4430
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x5036
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