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Before contest
Codeforces Round 961 (Div. 2)
11:09:24
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→ Filter Problems
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
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Status
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Custom test
Problems
#
Name
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x58121
431E
Chemistry Experiment
binary search
,
data structures
,
ternary search
2200
x935
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2290
431C
k-Tree
dp
,
implementation
,
trees
1600
x25102
431B
Shower Line
brute force
,
implementation
1200
x10636
431A
Black Square
implementation
800
x53118
430B
Balls Game
brute force
,
two pointers
1400
x3660
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2228
429E
Points and Segments
graphs
3000
x839
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2694
429C
Guess the Tree
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
trees
2300
x933
429B
Working out
dp
1600
x8414
429A
Xor-tree
dfs and similar
,
trees
1300
x10125
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1411
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2131
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13509
427B
Prison Transfer
data structures
,
implementation
1100
x13823
427A
Police Recruits
implementation
800
x75066
426B
Sereja and Mirroring
implementation
1300
x3783
426A
Sereja and Mugs
implementation
800
x9085
425E
Sereja and Sets
dp
2500
x605
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1416
425C
Sereja and Two Sequences
data structures
,
dp
2300
x886
425B
Sereja and Table
bitmasks
,
greedy
2200
x1303
425A
Sereja and Swaps
brute force
,
sortings
1500
x3833
424E
Colored Jenga
dfs and similar
,
dp
,
probabilities
2500
x130
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x558
424C
Magic Formulas
math
1600
x5266
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7417
424A
Squats
implementation
900
x8312
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x519
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x5845
420E
Playing the ball
geometry
2600
x214
420D
Cup Trick
data structures
2200
x782
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1241
420B
Online Meeting
implementation
1800
x1012
420A
Start Up
implementation
1000
x6057
418E
Tricky Password
data structures
3100
x300
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x474
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x787
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2425
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4637
417B
Crash
implementation
1400
x1765
417A
Elimination
dp
,
implementation
,
math
1500
x2936
416E
President's Path
dp
,
graphs
,
shortest paths
2500
x1399
416D
Population Size
greedy
,
implementation
,
math
2400
x936
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7753
416B
Art Union
brute force
,
dp
,
implementation
1300
x8579
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8775
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6186
415A
Mashmokh and Lights
implementation
900
x8895
414E
Mashmokh's Designed Problem
data structures
3200
x200
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x676
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2189
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x21507
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9725
413E
Maze 2D
data structures
,
divide and conquer
2200
x680
413D
2048
bitmasks
,
dp
2000
x780
413C
Jeopardy!
greedy
,
math
1400
x2329
413B
Spyke Chatting
implementation
1300
x1686
413A
Data Recovery
implementation
1200
x2566
412E
E-mail Addresses
implementation
1900
x832
412D
Giving Awards
dfs and similar
2000
x1829
412C
Pattern
implementation
,
strings
1200
x3902
412B
Network Configuration
greedy
,
sortings
900
x5343
412A
Poster
greedy
,
implementation
900
x4358
411C
Kicker
implementation
1700
x1220
411B
Multi-core Processor
implementation
1600
x1272
411A
Password Check
*special problem
,
implementation
800
x7133
409I
Feed the Golorp
*special problem
2400
x118
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8778
409G
On a plane
*special problem
,
geometry
2200
x508
409F
000001
*special problem
1900
x2060
409E
Dome
*special problem
1800
x565
409D
Big Data
*special problem
1700
x1703
409C
Magnum Opus
*special problem
1700
x1961
409B
Mysterious Language
*special problem
1700
x1350
409A
The Great Game
*special problem
1700
x2449
408B
Garland
implementation
1200
x9093
408A
Line to Cashier
implementation
900
x11128
407E
k-d-sequence
data structures
3100
x698
407D
Largest Submatrix 3
dp
,
hashing
2700
x556
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x963
407B
Long Path
dp
,
implementation
1600
x6462
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4786
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x233
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1143
405E
Graph Cutting
dfs and similar
,
graphs
2300
x1353
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3101
405C
Unusual Product
implementation
,
math
1600
x4593
405B
Domino Effect
1100
x5729
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x97492
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x571
404D
Minesweeper 1D
dp
,
implementation
1900
x2108
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5100
404B
Marathon
implementation
,
math
1500
x2905
404A
Valera and X
implementation
1000
x23454
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x203
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1078
402E
Strictly Positive Matrix
graphs
,
math
2200
x2141
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