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Codeforces Round 997 (Div. 2)
3 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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Problems
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Status
Standings
Custom test
Problems
#
Name
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x733
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1116
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11336
441B
Valera and Fruits
greedy
,
implementation
1400
x7136
441A
Valera and Antique Items
implementation
1000
x18643
440D
Berland Federalization
dp
,
trees
2200
x752
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x927
440B
Balancer
greedy
,
implementation
1600
x2009
440A
Forgotten Episode
implementation
800
x7609
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1590
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x6211
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3983
439B
Devu, the Dumb Guy
implementation
,
sortings
1200
x14459
439A
Devu, the Singer and Churu, the Joker
greedy
,
implementation
900
x25496
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1908
438D
The Child and Sequence
data structures
,
math
2300
x8957
437E
The Child and Polygon
dp
,
geometry
2500
x709
437D
The Child and Zoo
dsu
,
sortings
1900
x3437
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x14098
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9652
437A
The Child and Homework
implementation
1300
x9073
436F
Banners
brute force
,
data structures
,
dp
3000
x403
436E
Cardboard Box
data structures
,
greedy
2600
x1422
436D
Pudding Monsters
dp
2800
x326
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2689
436B
Om Nom and Spiders
implementation
,
math
1400
x3065
436A
Feed with Candy
greedy
1500
x3542
435E
Special Graph
2500
x246
435D
Special Grid
brute force
,
dp
,
greedy
2000
x762
435C
Cardiogram
implementation
1600
x2587
435B
Pasha Maximizes
greedy
1400
x7092
435A
Queue on Bus Stop
implementation
1000
x10259
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x301
434D
Nanami's Power Plant
flows
2900
x478
433E
Tachibana Kanade's Tofu
dp
2500
x492
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1249
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2503
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x41579
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x16608
432E
Square Tiling
constructive algorithms
,
greedy
2300
x703
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x9415
432C
Prime Swaps
greedy
,
sortings
1800
x2546
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11772
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x61696
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x1045
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2441
431C
k-Tree
dp
,
implementation
,
trees
1600
x26224
431B
Shower Line
brute force
,
implementation
1200
x10943
431A
Black Square
implementation
800
x56594
430B
Balls Game
brute force
,
two pointers
1400
x3748
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2294
429E
Points and Segments
graphs
3000
x904
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2965
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x961
429B
Working out
dp
1600
x8942
429A
Xor-tree
dfs and similar
,
trees
1300
x10512
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1451
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2230
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x14401
427B
Prison Transfer
data structures
,
implementation
1100
x14192
427A
Police Recruits
implementation
800
x81147
426B
Sereja and Mirroring
implementation
1300
x3829
426A
Sereja and Mugs
implementation
800
x9290
425E
Sereja and Sets
dp
2500
x692
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1476
425C
Sereja and Two Sequences
data structures
,
dp
2300
x908
425B
Sereja and Table
bitmasks
,
greedy
2200
x1326
425A
Sereja and Swaps
brute force
,
sortings
1500
x3925
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x135
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x569
424C
Magic Formulas
math
1600
x5514
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7823
424A
Squats
implementation
900
x8568
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x546
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x6271
420E
Playing the ball
geometry
2600
x222
420D
Cup Trick
data structures
2200
x861
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1273
420B
Online Meeting
implementation
1800
x1050
420A
Start Up
implementation
1000
x6318
418E
Tricky Password
data structures
3100
x324
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x489
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x855
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2567
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4707
417B
Crash
implementation
1400
x1846
417A
Elimination
dp
,
implementation
,
math
1500
x3070
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1561
416D
Population Size
greedy
,
implementation
,
math
2400
x962
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8112
416B
Art Union
brute force
,
dp
,
implementation
1300
x8814
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x9048
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6357
415A
Mashmokh and Lights
implementation
900
x9073
414E
Mashmokh's Designed Problem
data structures
3200
x200
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x691
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2242
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x23247
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9888
413E
Maze 2D
data structures
,
divide and conquer
2200
x753
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