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Before contest
Codeforces Round 954 (Div. 3)
6 days
→ Filter Problems
Difficulty:
—
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
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1409
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1002
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1334
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1275
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1555
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1165
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1024
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1733
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1064
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x241
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1199
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1847
1526E
Oolimry and Suffix Array
combinatorics
,
constructive algorithms
,
math
2400
x1032
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2095
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1258
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1416
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1672
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2065
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1879
1482F
Useful Edges
graphs
,
shortest paths
2400
x1477
1473E
Minimum Path
graphs
,
shortest paths
2400
x3356
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1862
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1465
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1442
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1284
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1230
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1587
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2133
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2178
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x740
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1744
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1888
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x289
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1551
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2178
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1948
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1272
1373F
Network Coverage
binary search
,
constructive algorithms
,
data structures
,
greedy
2400
x1626
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1376
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2030
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1464
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2139
1348E
Phoenix and Berries
brute force
,
dp
,
greedy
,
math
2400
x2043
1343F
Restore the Permutation by Sorted Segments
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1239
1340C
Nastya and Unexpected Guest
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x2080
1333E
Road to 1600
brute force
,
constructive algorithms
2400
x1487
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1552
1326E
Bombs
data structures
,
two pointers
2400
x2012
1304F2
Animal Observation (hard version)
data structures
,
dp
,
greedy
2400
x1335
1290C
Prefix Enlightenment
dfs and similar
,
dsu
,
graphs
2400
x1685
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1402
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x1134
1267A
Apprentice Learning Trajectory
2400
x962
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1128
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x848
1260E
Tournament
brute force
,
dp
,
greedy
2400
x1611
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1961
1252F
Regular Forestation
hashing
,
trees
2400
x891
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2541
1244G
Running in Pairs
constructive algorithms
,
greedy
,
math
2400
x1265
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1614
1239D
Catowice City
2-sat
,
dfs and similar
,
graph matchings
,
graphs
2400
x1921
1237E
Balanced Binary Search Trees
dp
,
math
2400
x1274
1227F2
Wrong Answer on test 233 (Hard Version)
combinatorics
,
math
2400
x1471
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x1008
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x362
1210D
Konrad and Company Evaluation
graphs
2400
x1433
1205C
Palindromic Paths
implementation
,
interactive
2400
x1133
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1971
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x976
1187D
Subarray Sorting
data structures
,
sortings
2400
x2480
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x758
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x495
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x809
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1466
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x688
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x649
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x942
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x732
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x844
1144G
Two Merged Sequences
dp
,
greedy
2400
x1893
1142C
U2
geometry
2400
x1315
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1695
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1498
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x968
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x900
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1835
1109D
Sasha and Interesting Fact from Graph Theory
brute force
,
combinatorics
,
dp
,
math
,
trees
2400
x1273
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x994
1107E
Vasya and Binary String
dp
2400
x2197
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x956
1101F
Trucks and Cities
binary search
,
dp
2400
x1281
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x910
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x872
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1399
1093F
Vasya and Array
dp
2400
x984
1093E
Intersection of Permutations
data structures
2400
x1504
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x979
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x483
1089M
Minegraphed
constructive algorithms
,
graphs
2400
x586
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