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Codeforces Round 937 (Div. 4)
00:16:02
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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
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shortest paths
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strings
ternary search
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Problems
#
Name
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1472
1093E
Intersection of Permutations
data structures
2400
x1471
1482F
Useful Edges
graphs
,
shortest paths
2400
x1460
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1456
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1455
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1452
1743E
FTL
binary search
,
dp
2400
x1444
1667C
Half Queen Cover
constructive algorithms
,
math
2400
x1444
869E
The Untended Antiquity
data structures
,
hashing
2400
x1444
1227F2
Wrong Answer on test 233 (Hard Version)
combinatorics
,
math
2400
x1443
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1435
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1434
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1429
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1426
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1424
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1418
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1417
1210D
Konrad and Company Evaluation
graphs
2400
x1416
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1402
1333E
Road to 1600
brute force
,
constructive algorithms
2400
x1400
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1397
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1390
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1382
1088E
Ehab and a component choosing problem
dp
,
greedy
,
math
,
trees
2400
x1379
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1375
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1367
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1363
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1359
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1355
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1352
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1345
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1342
115E
Linear Kingdom Races
data structures
,
dp
2400
x1342
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1340
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1338
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1338
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1332
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1328
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1327
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1326
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1317
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1305
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1291
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1291
643C
Levels and Regions
dp
2400
x1291
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1285
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1283
626E
Simple Skewness
binary search
,
math
,
ternary search
2400
x1282
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1271
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1270
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1270
1304F2
Animal Observation (hard version)
data structures
,
dp
,
greedy
2400
x1269
1244G
Running in Pairs
constructive algorithms
,
greedy
,
math
2400
x1258
1237E
Balanced Binary Search Trees
dp
,
math
2400
x1257
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1253
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1252
1109D
Sasha and Interesting Fact from Graph Theory
brute force
,
combinatorics
,
dp
,
math
,
trees
2400
x1250
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1247
1101F
Trucks and Cities
binary search
,
dp
2400
x1247
698C
LRU
bitmasks
,
dp
,
math
,
probabilities
2400
x1234
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1224
1343F
Restore the Permutation by Sorted Segments
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1223
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1217
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1215
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1202
277E
Binary Tree on Plane
flows
,
trees
2400
x1202
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1199
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1199
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1198
1005E2
Median on Segments (General Case Edition)
sortings
2400
x1186
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1174
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1173
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1167
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1162
1764E
Doremy's Number Line
dp
,
greedy
,
sortings
2400
x1159
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1152
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1149
1142C
U2
geometry
2400
x1148
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1139
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1137
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1135
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1123
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1122
1028E
Restore Array
constructive algorithms
2400
x1119
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1117
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1116
1205C
Palindromic Paths
implementation
,
interactive
2400
x1109
1680D
Dog Walking
brute force
,
greedy
,
math
2400
x1103
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1097
605C
Freelancer's Dreams
geometry
2400
x1084
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1082
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1076
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1074
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1070
377D
Developing Game
data structures
2400
x1069
1089K
King Kog's Reception
data structures
2400
x1061
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1057
526E
Transmitting Levels
dp
,
implementation
2400
x1051
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1050
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1046
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