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Before contest
Codeforces Round 994 (Div. 2)
19:35:45
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Difficulty:
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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
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13745
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x23381
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8849
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x12094
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x15504
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x15485
1513C
Add One
dp
,
matrices
1600
x14358
1512E
Permutation by Sum
brute force
,
greedy
,
math
1600
x10611
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11633
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6212
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x13559
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9884
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x17578
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x12496
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9461
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11743
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11472
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13956
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10829
1468K
The Robot
brute force
,
implementation
1600
x5178
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9337
1458A
Row GCD
math
,
number theory
1600
x18803
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12412
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x8058
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12957
1431C
Black Friday
*special problem
,
implementation
1600
x707
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4942
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x12255
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x27379
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15598
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x14250
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x17058
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x14121
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15792
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x13061
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x13288
1363C
Game On Leaves
games
,
trees
1600
x19041
1358C
Celex Update
math
1600
x17517
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x18336
1352G
Special Permutation
constructive algorithms
1600
x21772
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x17469
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14727
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x509
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x611
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15726
1342C
Yet Another Counting Problem
math
,
number theory
1600
x14155
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x20762
1334C
Circle of Monsters
brute force
,
constructive algorithms
,
greedy
,
math
1600
x16812
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13489
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9911
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x15050
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12240
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x13057
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11853
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8610
1288C
Two Arrays
combinatorics
,
dp
1600
x13151
1284C
New Year and Permutation
combinatorics
,
math
1600
x8118
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10304
1281B
Azamon Web Services
greedy
1600
x8345
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6743
1252C
Even Path
data structures
,
implementation
1600
x3762
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12594
1243B2
Character Swap (Hard Version)
strings
1600
x7123
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7467
1234D
Distinct Characters Queries
data structures
1600
x15485
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6463
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x9063
1223C
Save the Nature
binary search
,
greedy
1600
x8480
1217B
Zmei Gorynich
greedy
,
math
1600
x11326
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x11520
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8867
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9527
1198A
MP3
sortings
,
two pointers
1600
x9071
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9809
1188A1
Add on a Tree
trees
1600
x8467
1184D1
Parallel Universes (Easy)
implementation
1600
x2552
1184C1
Heidi and the Turing Test (Easy)
implementation
1600
x2304
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6859
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10834
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8480
1165D
Almost All Divisors
math
,
number theory
1600
x16435
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7288
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8489
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x11437
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7544
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9670
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6215
1137A
Skyscrapers
implementation
,
sortings
1600
x4499
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7948
1121C
System Testing
implementation
1600
x2013
1115U2
Chessboard unitary
*special problem
1600
x235
1115G3
Palindrome checker oracle
*special problem
1600
x232
1115G2
OR oracle
*special problem
1600
x312
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8554
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8870
1096C
Polygon for the Angle
brute force
,
geometry
1600
x6856
1095D
Circular Dance
implementation
1600
x7622
1085C
Connect Three
implementation
,
math
1600
x5464
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5799
1082B
Vova and Trophies
greedy
1600
x7618
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