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Before contest
Codeforces Round 973 (Div. 2)
06:09:19
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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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Custom test
Problems
#
Name
437D
The Child and Zoo
dsu
,
sortings
1900
x3368
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13897
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9453
437A
The Child and Homework
implementation
1300
x8991
436F
Banners
brute force
,
data structures
,
dp
3000
x388
436E
Cardboard Box
data structures
,
greedy
2600
x1334
436D
Pudding Monsters
dp
2800
x326
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2623
436B
Om Nom and Spiders
implementation
,
math
1400
x3048
436A
Feed with Candy
greedy
1500
x3464
435E
Special Graph
2500
x240
435D
Special Grid
brute force
,
dp
,
greedy
2000
x756
435C
Cardiogram
implementation
1600
x2564
435B
Pasha Maximizes
greedy
1400
x6942
435A
Queue on Bus Stop
implementation
1000
x10139
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x260
434D
Nanami's Power Plant
flows
2900
x464
433E
Tachibana Kanade's Tofu
dp
2500
x477
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1242
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2480
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x39023
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x16270
432E
Square Tiling
constructive algorithms
,
greedy
2300
x686
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8999
432C
Prime Swaps
greedy
,
sortings
1800
x2510
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11639
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x59195
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x996
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2312
431C
k-Tree
dp
,
implementation
,
trees
1600
x25465
431B
Shower Line
brute force
,
implementation
1200
x10760
431A
Black Square
implementation
800
x54400
430B
Balls Game
brute force
,
two pointers
1400
x3694
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2236
429E
Points and Segments
graphs
3000
x857
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2907
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x940
429B
Working out
dp
1600
x8579
429A
Xor-tree
dfs and similar
,
trees
1300
x10288
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1422
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2166
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13803
427B
Prison Transfer
data structures
,
implementation
1100
x13924
427A
Police Recruits
implementation
800
x77168
426B
Sereja and Mirroring
implementation
1300
x3793
426A
Sereja and Mugs
implementation
800
x9156
425E
Sereja and Sets
dp
2500
x640
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1432
425C
Sereja and Two Sequences
data structures
,
dp
2300
x895
425B
Sereja and Table
bitmasks
,
greedy
2200
x1310
425A
Sereja and Swaps
brute force
,
sortings
1500
x3884
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x131
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x562
424C
Magic Formulas
math
1600
x5334
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7478
424A
Squats
implementation
900
x8386
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x526
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x6010
420E
Playing the ball
geometry
2600
x217
420D
Cup Trick
data structures
2200
x830
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1256
420B
Online Meeting
implementation
1800
x1036
420A
Start Up
implementation
1000
x6102
418E
Tricky Password
data structures
3100
x302
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x479
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x820
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2468
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4657
417B
Crash
implementation
1400
x1767
417A
Elimination
dp
,
implementation
,
math
1500
x2967
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1448
416D
Population Size
greedy
,
implementation
,
math
2400
x942
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7868
416B
Art Union
brute force
,
dp
,
implementation
1300
x8625
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8877
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6248
415A
Mashmokh and Lights
implementation
900
x8957
414E
Mashmokh's Designed Problem
data structures
3200
x200
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x682
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2216
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x22101
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9777
413E
Maze 2D
data structures
,
divide and conquer
2200
x700
413D
2048
bitmasks
,
dp
2000
x811
413C
Jeopardy!
greedy
,
math
1400
x2368
413B
Spyke Chatting
implementation
1300
x1698
413A
Data Recovery
implementation
1200
x2615
412E
E-mail Addresses
implementation
1900
x840
412D
Giving Awards
dfs and similar
2000
x1875
412C
Pattern
implementation
,
strings
1200
x3913
412B
Network Configuration
greedy
,
sortings
900
x5392
412A
Poster
greedy
,
implementation
900
x4425
411C
Kicker
implementation
1700
x1223
411B
Multi-core Processor
implementation
1600
x1274
411A
Password Check
*special problem
,
implementation
800
x7202
409I
Feed the Golorp
*special problem
2400
x121
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8878
409G
On a plane
*special problem
,
geometry
2200
x515
409F
000001
*special problem
1900
x2086
409E
Dome
*special problem
1800
x571
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