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Codeforces Round 977 (Div. 2)
2 days
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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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Custom test
Problems
#
Name
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20438
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22632
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x24283
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x21075
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x28855
1395B
Boboniu Plays Chess
constructive algorithms
1100
x16058
1392C
Omkar and Waterslide
greedy
,
implementation
1200
x18785
1385C
Make It Good
greedy
1200
x26979
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18789
1382B
Sequential Nim
dp
,
games
1100
x24665
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20493
1375B
Neighbor Grid
constructive algorithms
,
greedy
1200
x17277
1375A
Sign Flipping
constructive algorithms
,
math
1100
x18346
1373C
Pluses and Minuses
math
1300
x18357
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x28015
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20536
1371B
Magical Calendar
math
1200
x19171
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x23679
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x24408
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x23489
1366B
Shuffle
math
,
two pointers
1300
x21019
1366A
Shovels and Swords
binary search
,
greedy
,
math
1100
x30086
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x26853
1365A
Matrix Game
games
,
greedy
,
implementation
1100
x24095
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x19868
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x28060
1363A
Odd Selection
brute force
,
implementation
,
math
1200
x35903
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x19178
1360E
Polygon
dp
,
graphs
,
implementation
,
shortest paths
1300
x25296
1360D
Buying Shovels
math
,
number theory
1300
x33164
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x32851
1355B
Young Explorers
dp
,
greedy
,
sortings
1200
x25675
1355A
Sequence with Digits
brute force
,
implementation
,
math
1200
x26575
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x30909
1352D
Alice, Bob and Candies
implementation
1300
x26179
1352C
K-th Not Divisible by n
binary search
,
math
1200
x54474
1352B
Same Parity Summands
constructive algorithms
,
math
1200
x37620
1345B
Card Constructions
binary search
,
brute force
,
dp
,
math
1100
x26427
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x38370
1342B
Binary Period
constructive algorithms
,
strings
1100
x23690
1341B
Nastya and Door
greedy
,
implementation
1300
x19672
1339B
Sorted Adjacent Differences
constructive algorithms
,
sortings
1200
x26388
1335D
Anti-Sudoku
constructive algorithms
,
implementation
1300
x27420
1335C
Two Teams Composing
binary search
,
greedy
,
implementation
,
sortings
1100
x34620
1334B
Middle Class
greedy
,
sortings
1100
x25856
1334A
Level Statistics
implementation
,
math
1200
x23269
1333B
Kind Anton
greedy
,
implementation
1100
x21602
1332A
Exercising Walk
greedy
,
implementation
,
math
1100
x19412
1328C
Ternary XOR
greedy
,
implementation
1200
x30467
1328B
K-th Beautiful String
binary search
,
brute force
,
combinatorics
,
implementation
,
math
1300
x29089
1327B
Princesses and Princes
brute force
,
graphs
,
greedy
1200
x18702
1327A
Sum of Odd Integers
math
1100
x38904
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x15629
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x27942
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x28468
1322A
Unusual Competitions
greedy
1300
x12432
1315C
Restoring Permutation
greedy
1200
x10088
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9195
1311C
Perform the Combo
brute force
1300
x16020
1311B
WeirdSort
dfs and similar
,
sortings
1200
x18890
1307B
Cow and Friend
geometry
,
greedy
,
math
1300
x13254
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11751
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17871
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x34765
1294B
Collecting Packages
implementation
,
sortings
1200
x21814
1293A
ConneR and the A.R.C. Markland-N
binary search
,
brute force
,
implementation
1100
x15410
1291B
Array Sharpening
greedy
,
implementation
1300
x14171
1288B
Yet Another Meme Problem
math
1100
x17053
1288A
Deadline
binary search
,
brute force
,
math
,
ternary search
1100
x18283
1285B
Just Eat It!
dp
,
greedy
,
implementation
1300
x22679
1279B
Verse For Santa
binary search
,
brute force
,
implementation
1300
x13656
1277B
Make Them Odd
greedy
,
number theory
1200
x15193
1272C
Yet Another Broken Keyboard
combinatorics
,
dp
,
implementation
1200
x26534
1272B
Snow Walking Robot
constructive algorithms
,
greedy
,
implementation
1200
x13902
1271C
Shawarma Tent
brute force
,
geometry
,
greedy
,
implementation
1300
x10568
1271B
Blocks
greedy
,
math
1300
x11343
1270B
Interesting Subarray
constructive algorithms
,
greedy
,
math
1200
x16377
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12580
1263A
Sweet Problem
math
1100
x16328
1260B
Obtain Two Zeroes
binary search
,
math
1300
x15741
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15955
1255B
Fridge Lockers
graphs
,
implementation
1100
x11955
1249C1
Good Numbers (easy version)
brute force
,
greedy
,
implementation
1300
x15520
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16779
1245B
Restricted RPS
constructive algorithms
,
dp
,
greedy
1200
x13801
1238B
Kill `Em All
greedy
,
sortings
1300
x13614
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x16036
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x10158
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16903
1231C
Increasing Matrix
greedy
1100
x3848
1227B
Box
constructive algorithms
1200
x9653
1227A
Math Problem
math
1100
x9819
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10601
1221C
Perfect Team
binary search
,
math
1200
x21052
1221B
Knights
constructive algorithms
,
greedy
1100
x11956
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10206
1220B
Multiplication Table
math
,
number theory
1300
x11604
1217A
Creating a Character
binary search
,
math
1300
x15004
1216D
Swords
math
1300
x11138
1214C
Bad Sequence
data structures
,
greedy
1200
x13262
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