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Problems
#
Name
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x11777
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9129
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11372
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11115
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13093
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10543
1468K
The Robot
brute force
,
implementation
1600
x4989
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9035
1458A
Row GCD
math
,
number theory
1600
x16543
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12050
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7797
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12385
1431C
Black Friday
*special problem
,
implementation
1600
x699
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4707
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11553
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x24651
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15057
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13612
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16014
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x13596
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15128
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12862
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x12784
1363C
Game On Leaves
games
,
trees
1600
x18030
1358C
Celex Update
math
1600
x17107
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x17535
1352G
Special Permutation
constructive algorithms
1600
x20162
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x16263
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14294
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x483
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x585
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15332
1342C
Yet Another Counting Problem
math
,
number theory
1600
x13713
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19592
1334C
Circle of Monsters
brute force
,
constructive algorithms
,
greedy
,
math
1600
x16208
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13139
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9662
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x13992
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12026
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12738
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11531
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8469
1288C
Two Arrays
combinatorics
,
dp
1600
x12536
1284C
New Year and Permutation
combinatorics
,
math
1600
x7890
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10044
1281B
Azamon Web Services
greedy
1600
x8208
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6570
1252C
Even Path
data structures
,
implementation
1600
x3638
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12020
1243B2
Character Swap (Hard Version)
strings
1600
x7002
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7252
1234D
Distinct Characters Queries
data structures
1600
x14459
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6154
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8820
1223C
Save the Nature
binary search
,
greedy
1600
x7986
1217B
Zmei Gorynich
greedy
,
math
1600
x11065
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x11258
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8613
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9354
1198A
MP3
sortings
,
two pointers
1600
x8937
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9530
1188A1
Add on a Tree
trees
1600
x8318
1184D1
Parallel Universes (Easy)
implementation
1600
x2485
1184C1
Heidi and the Turing Test (Easy)
implementation
1600
x2278
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6696
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10378
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8048
1165D
Almost All Divisors
math
,
number theory
1600
x15431
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7117
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8244
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x10812
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7307
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9319
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5937
1137A
Skyscrapers
implementation
,
sortings
1600
x4439
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7590
1121C
System Testing
implementation
1600
x1945
1115U2
Chessboard unitary
*special problem
1600
x231
1115G3
Palindrome checker oracle
*special problem
1600
x228
1115G2
OR oracle
*special problem
1600
x309
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8400
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8458
1096C
Polygon for the Angle
brute force
,
geometry
1600
x6695
1095D
Circular Dance
implementation
1600
x7438
1085C
Connect Three
implementation
,
math
1600
x5379
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5531
1082B
Vova and Trophies
greedy
1600
x7436
1077D
Cutting Out
binary search
,
sortings
1600
x8470
1065C
Make It Equal
greedy
1600
x7685
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5336
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4832
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7002
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5724
1056B
Divide Candies
math
,
number theory
1600
x4154
1045I
Palindrome Pairs
hashing
,
strings
1600
x4213
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9327
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x9028
1036B
Diagonal Walking v.2
math
1600
x5634
1033C
Permutation Game
brute force
,
dp
,
games
1600
x5413
1031C
Cram Time
greedy
1600
x5180
←
1
2
3
4
5
→
→ Pay attention
Before contest
Codeforces Round 954 (Div. 3)
5 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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