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Before contest
Codeforces Round 941 (Div. 1)
16:45:54
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Before contest
Codeforces Round 941 (Div. 2)
16:45:54
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graphs
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
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number theory
probabilities
schedules
shortest paths
sortings
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ternary search
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Problems
#
Name
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1764
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1777
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1892
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x1981
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x1985
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2132
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2183
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2216
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2330
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2431
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2647
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2657
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2830
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2840
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2892
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3061
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3090
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3238
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3254
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3264
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3301
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3312
1677C
Tokitsukaze and Two Colorful Tapes
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1900
x3389
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3498
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3596
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3646
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3686
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3773
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3813
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3905
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3914
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x3973
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4026
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4293
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4347
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4418
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4552
1276B
Two Fairs
combinatorics
,
dfs and similar
,
dsu
,
graphs
1900
x4663
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4761
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4803
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4850
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4903
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x4943
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4963
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5124
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5515
1095F
Make It Connected
dsu
,
graphs
,
greedy
1900
x5829
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5831
25C
Roads in Berland
graphs
,
shortest paths
1900
x5835
1272E
Nearest Opposite Parity
dfs and similar
,
graphs
,
shortest paths
1900
x5836
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x5906
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6015
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6139
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6282
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6867
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6954
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8251
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x8767
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10287
20C
Dijkstra?
graphs
,
shortest paths
1900
x29723
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x683
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1480
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2052
863C
1-2-3
graphs
,
implementation
1800
x2402
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2505
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2578
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2757
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x2839
1666L
Labyrinth
dfs and similar
,
graphs
1800
x2975
263D
Cycle in Graph
dfs and similar
,
graphs
1800
x3227
1082D
Maximum Diameter Graph
constructive algorithms
,
graphs
,
implementation
1800
x3544
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3652
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3766
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3861
1081D
Maximum Distance
dsu
,
graphs
,
shortest paths
,
sortings
1800
x3875
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x3880
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4126
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4245
623A
Graph and String
constructive algorithms
,
graphs
1800
x4355
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4380
1076D
Edge Deletion
graphs
,
greedy
,
shortest paths
1800
x4889
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4957
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x4993
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5125
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5305
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5371
721C
Journey
dp
,
graphs
1800
x5658
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5738
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5752
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6015
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6065
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6233
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6591
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6669
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6675
1334D
Minimum Euler Cycle
constructive algorithms
,
graphs
,
greedy
,
implementation
1800
x6974
1063B
Labyrinth
graphs
,
shortest paths
1800
x7044
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x7086
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7214
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7302
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