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Please read
the new rule regarding the restriction on the use of AI tools
.
×
→ Pay attention
Before contest
Codeforces Round 975 (Div. 1)
3 days
Before contest
Codeforces Round 975 (Div. 2)
3 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
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Status
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Custom test
Problems
#
Name
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11478
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6151
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x13380
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9672
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x17202
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x12134
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9376
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11610
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11351
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x13573
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10733
1468K
The Robot
brute force
,
implementation
1600
x5089
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9217
1458A
Row GCD
math
,
number theory
1600
x17619
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12299
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7969
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12717
1431C
Black Friday
*special problem
,
implementation
1600
x704
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4834
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11977
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x26248
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15418
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x14086
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16705
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x14014
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x15585
1371D
Grid-00100
constructive algorithms
,
greedy
,
implementation
1600
x12980
1364C
Ehab and Prefix MEXs
brute force
,
constructive algorithms
,
greedy
1600
x13148
1363C
Game On Leaves
games
,
trees
1600
x18654
1358C
Celex Update
math
1600
x17356
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x18067
1352G
Special Permutation
constructive algorithms
1600
x21136
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x17010
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14613
1346D
Constructing the Dungeon
*special problem
,
graphs
,
greedy
1600
x502
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x605
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15624
1342C
Yet Another Counting Problem
math
,
number theory
1600
x14012
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x20335
1334C
Circle of Monsters
brute force
,
constructive algorithms
,
greedy
,
math
1600
x16580
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13412
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9808
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14536
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12144
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12910
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11717
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8564
1288C
Two Arrays
combinatorics
,
dp
1600
x12854
1284C
New Year and Permutation
combinatorics
,
math
1600
x8006
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10174
1281B
Azamon Web Services
greedy
1600
x8284
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6701
1252C
Even Path
data structures
,
implementation
1600
x3718
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12379
1243B2
Character Swap (Hard Version)
strings
1600
x7083
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7413
1234D
Distinct Characters Queries
data structures
1600
x14945
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6395
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8949
1223C
Save the Nature
binary search
,
greedy
1600
x8304
1217B
Zmei Gorynich
greedy
,
math
1600
x11190
1213D2
Equalizing by Division (hard version)
brute force
,
math
,
sortings
1600
x11430
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8742
1198B
Welfare State
binary search
,
brute force
,
data structures
,
sortings
1600
x9442
1198A
MP3
sortings
,
two pointers
1600
x9007
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9705
1188A1
Add on a Tree
trees
1600
x8397
1184D1
Parallel Universes (Easy)
implementation
1600
x2527
1184C1
Heidi and the Turing Test (Easy)
implementation
1600
x2291
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6771
1175B
Catch Overflow!
data structures
,
expression parsing
,
implementation
1600
x10621
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8281
1165D
Almost All Divisors
math
,
number theory
1600
x15950
1163B2
Cat Party (Hard Edition)
data structures
,
implementation
1600
x7204
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8393
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x11138
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7380
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9540
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6132
1137A
Skyscrapers
implementation
,
sortings
1600
x4465
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7771
1121C
System Testing
implementation
1600
x1994
1115U2
Chessboard unitary
*special problem
1600
x234
1115G3
Palindrome checker oracle
*special problem
1600
x231
1115G2
OR oracle
*special problem
1600
x312
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8489
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8744
1096C
Polygon for the Angle
brute force
,
geometry
1600
x6808
1095D
Circular Dance
implementation
1600
x7547
1085C
Connect Three
implementation
,
math
1600
x5430
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5707
1082B
Vova and Trophies
greedy
1600
x7559
1077D
Cutting Out
binary search
,
sortings
1600
x8854
1065C
Make It Equal
greedy
1600
x7801
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5407
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4887
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7105
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5862
1056B
Divide Candies
math
,
number theory
1600
x4204
1045I
Palindrome Pairs
hashing
,
strings
1600
x4399
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