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Contest is running
2023 Post World Finals Online ICPC Challenge powered by Huawei
10 days
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Before contest
Codeforces Round 944 (Div. 4)
04:14:39
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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
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x5906
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5177
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x1910
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2426
1409F
Subsequences of Length Two
dp
,
strings
2100
x4269
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4163
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5683
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3768
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3237
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4933
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4028
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6123
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1323
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x671
1385E
Directing Edges
constructive algorithms
,
dfs and similar
,
graphs
2000
x6811
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4620
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5419
1372D
Omkar and Circle
brute force
,
dp
,
games
,
greedy
2100
x5291
1370E
Binary Subsequence Rotation
binary search
,
constructive algorithms
,
data structures
,
greedy
2100
x4611
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9129
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x2984
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x3960
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9918
1365F
Swaps Again
constructive algorithms
,
implementation
,
sortings
2100
x4306
1364D
Ehab's Last Corollary
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2100
x4015
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6484
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3828
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4283
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5730
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8950
1355E
Restorer Distance
binary search
,
greedy
,
math
,
sortings
,
ternary search
2100
x4718
1354E
Graph Coloring
dfs and similar
,
dp
,
graphs
2100
x3061
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x5811
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4225
1349B
Orac and Medians
constructive algorithms
,
greedy
,
math
2000
x7716
1346F
Dune II: Battle For Arrakis
*special problem
,
data structures
,
greedy
,
math
2000
x218
1344B
Monopole Magnets
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2000
x5773
1343E
Weights Distributing
brute force
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x4812
1333D
Challenges in school №41
brute force
,
constructive algorithms
,
games
,
graphs
,
greedy
,
implementation
,
sortings
2100
x3687
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3596
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3948
1320C
World of Darkraft: Battle for Azathoth
brute force
,
data structures
,
sortings
2000
x2902
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3206
1312E
Array Shrinking
dp
,
greedy
2100
x5535
1311D
Three Integers
brute force
,
math
2000
x8645
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4921
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x3808
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3641
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2672
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4730
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5352
1288E
Messenger Simulator
data structures
2000
x3334
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x6684
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2914
1280C
Jeremy Bearimy
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2481
1278D
Segment Tree
data structures
,
dsu
,
graphs
,
trees
2100
x3726
1271E
Common Number
binary search
,
combinatorics
,
dp
,
math
2100
x3115
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x2752
1268B
Domino for Young
dp
,
greedy
,
math
2000
x5618
1267K
Key Storage
combinatorics
,
math
2100
x1738
1266E
Spaceship Solitaire
data structures
,
greedy
,
implementation
2100
x2069
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3409
1265E
Beautiful Mirrors
data structures
,
dp
,
math
,
probabilities
2100
x3320
1263E
Editor
data structures
,
implementation
2100
x2594
1257E
The Contest
data structures
,
dp
,
greedy
2000
x4119
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3063
1256E
Yet Another Division Into Teams
dp
,
greedy
,
sortings
2000
x3874
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x2934
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1785
1252G
Performance Review
data structures
2100
x1361
1250N
Wires
dfs and similar
,
graphs
,
greedy
2000
x1545
1250C
Trip to Saint Petersburg
data structures
2100
x1289
1248D1
The World Is Just a Programming Task (Easy Version)
brute force
,
dp
,
greedy
,
implementation
2000
x2287
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4813
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7425
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x3792
1234E
Special Permutations
math
2000
x2583
1223E
Paint the Tree
dp
,
sortings
,
trees
2100
x2521
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3928
1219G
Harvester
implementation
2000
x604
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x571
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x4944
1216F
Wi-Fi
data structures
,
dp
,
greedy
2100
x2331
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x2506
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2334
1211E
Double Permutation Inc.
*special problem
,
binary search
,
greedy
2000
x188
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x223
1210C
Kamil and Making a Stream
math
,
number theory
,
trees
2000
x3204
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2868
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2716
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x4730
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2972
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2849
1203F1
Complete the Projects (easy version)
greedy
2100
x3299
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2465
1201D
Treasure Hunting
binary search
,
dp
,
greedy
,
implementation
2100
x2277
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6959
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x3404
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2915
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2214
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