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Please read
the new rule regarding the restriction on the use of AI tools
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Before contest
Codeforces Round 978 (Div. 2)
6 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
Standings
Custom test
Problems
#
Name
1311E
Construct the Binary Tree
brute force
,
constructive algorithms
,
trees
2200
x2352
1311D
Three Integers
brute force
,
math
2000
x9056
1311C
Perform the Combo
brute force
1300
x16029
1311B
WeirdSort
dfs and similar
,
sortings
1200
x18903
1311A
Add Odd or Subtract Even
greedy
,
implementation
,
math
800
x41939
1310F
Bad Cryptography
math
,
number theory
3400
x75
1310E
Strange Function
dp
2900
x290
1310D
Tourism
dp
,
graphs
,
probabilities
2300
x1578
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x522
1310B
Double Elimination
dp
,
implementation
2500
x517
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5175
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x502
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x590
1307E
Cow and Treats
binary search
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
2500
x1280
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6388
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11830
1307B
Cow and Friend
geometry
,
greedy
,
math
1300
x13259
1307A
Cow and Haybales
greedy
,
implementation
800
x14957
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x120
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x986
1305F
Kuroni and the Punishment
math
,
number theory
,
probabilities
2500
x2660
1305E
Kuroni and the Score Distribution
constructive algorithms
,
greedy
,
implementation
,
math
2200
x3105
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x5008
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14653
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11755
1305A
Kuroni and the Gifts
brute force
,
constructive algorithms
,
greedy
,
sortings
800
x14082
1304F2
Animal Observation (hard version)
data structures
,
dp
,
greedy
2400
x1535
1304F1
Animal Observation (easy version)
data structures
,
dp
2300
x1768
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x5242
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6329
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16394
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17873
1304A
Two Rabbits
math
800
x25447
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x797
1303F
Number of Components
dsu
,
implementation
2800
x534
1303E
Erase Subsequences
dp
,
strings
2200
x2816
1303D
Fill The Bag
bitmasks
,
greedy
1900
x7100
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12168
1303B
National Project
math
1400
x15781
1303A
Erasing Zeroes
implementation
,
strings
800
x32232
1302J
Keep talking and nobody explodes -- hard
x10
1302I
Deja vu
x2
1302H
Who needs suffix structures?
x8
1302G
Keep talking and nobody explodes -- medium
x23
1302F
Keep talking and nobody explodes -- easy
bitmasks
,
brute force
,
expression parsing
x74
1302E
Amazing bitset
x46
1302D
Dijkstra
x96
1302C
Segment tree or Fenwick?
data structures
x382
1302B
DAG
constructive algorithms
x145
1302A
Nash equilibrium
x297
1301F
Super Jaber
dfs and similar
,
graphs
,
implementation
,
shortest paths
2600
x1279
1301E
Nanosoft
binary search
,
data structures
,
dp
,
implementation
2500
x1525
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x4009
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9346
1301B
Motarack's Birthday
binary search
,
greedy
,
ternary search
1500
x14239
1301A
Three Strings
implementation
,
strings
800
x19381
1300B
Assigning to Classes
greedy
,
implementation
,
sortings
1000
x23474
1300A
Non-zero
implementation
,
math
800
x21014
1299E
So Mean
interactive
,
math
3400
x164
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x440
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3946
1299B
Aerodynamic
geometry
1800
x5250
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x12037
1297I
Falling Blocks
*special problem
,
data structures
x31
1297H
Paint the String
*special problem
,
dp
,
strings
x44
1297G
M-numbers
*special problem
,
dp
,
math
x70
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x117
1297E
Modernization of Treeland
*special problem
,
dfs and similar
,
trees
x205
1297D
Bonus Distribution
*special problem
,
binary search
,
greedy
,
sortings
x262
1297C
Dream Team
*special problem
,
greedy
x399
1297B
Cartoons
*special problem
,
implementation
,
sortings
x413
1297A
Likes Display
*special problem
,
implementation
x941
1296F
Berland Beauty
constructive algorithms
,
dfs and similar
,
greedy
,
sortings
,
trees
2100
x2892
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x5043
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x7490
1296D
Fight with Monsters
greedy
,
sortings
1500
x14262
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x14826
1296B
Food Buying
math
900
x30225
1296A
Array with Odd Sum
math
800
x41781
1295F
Good Contest
combinatorics
,
dp
,
probabilities
2700
x1243
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2535
1295D
Same GCDs
math
,
number theory
1800
x8912
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12923
1295B
Infinite Prefixes
math
,
strings
1700
x9309
1295A
Display The Number
greedy
900
x22829
1294F
Three Paths on a Tree
dfs and similar
,
dp
,
greedy
,
trees
2000
x5792
1294E
Obtain a Permutation
greedy
,
implementation
,
math
1900
x4923
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11749
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x34830
1294B
Collecting Packages
implementation
,
sortings
1200
x21823
1294A
Collecting Coins
math
800
x46844
1293B
JOE is on TV!
combinatorics
,
greedy
,
math
1000
x21213
1293A
ConneR and the A.R.C. Markland-N
binary search
,
brute force
,
implementation
1100
x15413
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x311
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x353
1292D
Chaotic V.
dp
,
graphs
,
greedy
,
math
,
number theory
,
trees
2700
x811
1292C
Xenon's Attack on the Gangs
combinatorics
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2066
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6368
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13354
1291F
Coffee Varieties (easy version)
graphs
,
interactive
2800
x662
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