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Codeforces Round 974 (Div. 3)
08:41:36
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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
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x491
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3258
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15521
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x24299
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15346
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x16221
1419A
Digit Game
games
,
greedy
,
implementation
900
x19542
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1884
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x368
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1849
1418D
Trash Problem
data structures
,
implementation
2100
x4352
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x19750
1418B
Negative Prefixes
greedy
,
sortings
1300
x16652
1418A
Buying Torches
math
1000
x22937
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14457
1417A
Copy-paste
greedy
,
math
800
x18226
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x462
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x289
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x2046
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4401
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x6111
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12472
1415F
Cakes for Clones
dp
2900
x484
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2708
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5384
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10858
1415B
Repainting Street
brute force
,
brute force
,
greedy
1100
x12173
1415A
Prison Break
brute force
,
math
800
x15151
1413F
Roads and Ramen
data structures
,
trees
2800
x775
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x2013
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6484
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5708
1413B
A New Technique
implementation
1100
x11708
1413A
Finding Sasuke
constructive algorithms
,
math
800
x14751
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x660
1411F
The Thorny Path
greedy
,
math
3000
x371
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1633
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2514
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7966
1411B
Fair Numbers
brute force
,
number theory
1000
x19209
1411A
In-game Chat
implementation
800
x20591
1409F
Subsequences of Length Two
dp
,
strings
2100
x4444
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7811
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19357
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x23262
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x28922
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x65971
1408I
Bitwise Magic
dp
,
math
3200
x174
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x399
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x1032
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2364
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1974
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4304
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8833
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9938
1408A
Circle Coloring
constructive algorithms
800
x12489
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1689
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4801
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11967
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16990
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20412
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1614
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3488
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10243
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22589
1406A
Subset Mex
greedy
,
implementation
,
math
900
x21412
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x21507
1405A
Permutation Forgery
constructive algorithms
800
x21433
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1232
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x1074
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2656
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7380
1404A
Balanced Bitstring
implementation
,
strings
1500
x15351
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x51
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x366
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x290
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x203
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x110
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1186
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1738
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2416
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9290
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x24214
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x21069
1401A
Distance and Axis
constructive algorithms
,
math
900
x27418
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x956
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x887
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5420
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x10235
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x17290
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11171
1400A
String Similarity
constructive algorithms
,
strings
800
x26991
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1605
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2270
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5814
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x18231
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x28755
1399B
Gifts Fixing
greedy
800
x43432
1399A
Remove Smallest
greedy
,
sortings
800
x66138
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x1085
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