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Before contest
CodeCraft-22 and Codeforces Round #795 (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
flows
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
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x100
1023G
Pisces
data structures
,
flows
,
trees
3400
x72
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x191
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x211
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x137
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x161
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x166
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x176
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x240
1666K
Kingdom Partition
flows
3200
x61
1383F
Special Edges
flows
,
graphs
3200
x154
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x185
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x380
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x411
1488I
Demonic Invasion
*special problem
,
flows
3100
x22
925F
Parametric Circulation
binary search
,
flows
3100
x72
1250K
Projectors
flows
,
graphs
3100
x82
1307G
Cow and Exercise
flows
,
graphs
,
shortest paths
3100
x280
704D
Captain America
flows
,
greedy
3100
x466
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x63
843E
Maximum Flow
flows
,
graphs
3000
x114
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x125
212A
Privatization
flows
,
graphs
3000
x132
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x172
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x1352
126E
Pills
brute force
,
flows
2900
x57
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x153
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x242
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x308
434D
Nanami's Power Plant
flows
2900
x315
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x325
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x441
708D
Incorrect Flow
flows
2900
x494
103E
Buying Sets
flows
,
graph matchings
2900
x506
724E
Goods transportation
dp
,
flows
,
greedy
2900
x889
513F2
Scaygerboss
flows
2800
x219
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x223
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x243
1684G
Euclid Guess
constructive algorithms
,
flows
,
graph matchings
,
math
,
number theory
2800
x278
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x301
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x685
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x695
1184B3
The Doctor Meets Vader (Hard)
flows
,
shortest paths
2700
x142
62E
World Evil
dp
,
flows
2700
x160
513F1
Scaygerboss
flows
2700
x215
1054F
Electric Scheme
flows
,
graph matchings
2700
x264
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x360
132E
Bits of merry old England
flows
,
graphs
2700
x366
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x420
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x564
1473F
Strange Set
flows
,
math
2700
x673
802C
Heidi and Library (hard)
flows
2600
x362
1061E
Politics
flows
,
graphs
2600
x396
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x418
818G
Four Melodies
flows
,
graphs
2600
x423
1510B
Button Lock
flows
,
graph matchings
,
graphs
2600
x539
1107F
Vasya and Endless Credits
dp
,
flows
,
graph matchings
,
graphs
,
sortings
2600
x567
813D
Two Melodies
dp
,
flows
2600
x709
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x241
1187G
Gang Up
flows
,
graphs
2500
x365
976F
Minimal k-covering
flows
,
graphs
2500
x443
628F
Bear and Fair Set
flows
,
graphs
2500
x542
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x649
1198E
Rectangle Painting 2
flows
,
graph matchings
,
graphs
2500
x720
1354F
Summoning Minions
constructive algorithms
,
dp
,
flows
,
graph matchings
,
greedy
,
sortings
2500
x823
720B
Cactusophobia
dfs and similar
,
flows
2400
x295
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x434
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x512
717G
Underfail
flows
2400
x514
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x576
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x615
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x678
808F
Card Game
binary search
,
flows
,
graphs
2400
x679
164C
Machine Programming
flows
,
graphs
2400
x728
277E
Binary Tree on Plane
flows
,
trees
2400
x873
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1153
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1233
1082G
Petya and Graph
flows
,
graphs
2400
x1291
491C
Deciphering
flows
,
graph matchings
2300
x310
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x399
1090E
Horseback Riding
flows
,
graphs
2300
x436
1252L
Road Construction
flows
,
graphs
2300
x478
316C2
Tidying Up
flows
,
graph matchings
2300
x496
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x627
311E
Biologist
flows
2300
x716
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x989
510E
Fox And Dinner
flows
2300
x1794
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x474
316C1
Tidying Up
flows
2200
x475
863F
Almost Permutation
flows
2200
x936
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1564
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x1834
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x1861
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2297
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x714
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1431
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x2679
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x2802
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x1238
237E
Build String
flows
,
graphs
2000
x1296
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