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Educational Codeforces Round 167 (Rated for Div. 2)
24:02:55
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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
80A
Panoramix's Prediction
brute force
800
x50655
79E
Security System
math
2900
x122
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x963
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1740
79B
Colorful Field
implementation
,
sortings
1400
x6904
79A
Bus Game
greedy
1200
x3992
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x530
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x304
78C
Beaver Game
dp
,
games
,
number theory
2000
x1822
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12915
78A
Haiku
implementation
,
strings
800
x12106
77E
Martian Food
geometry
2800
x370
77D
Domino Carpet
dp
,
implementation
2300
x316
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x981
77B
Falling Anvils
math
,
probabilities
1800
x2558
77A
Heroes
brute force
,
implementation
1400
x1751
76F
Tourist
binary search
,
data structures
,
dp
2300
x611
76E
Points
implementation
,
math
1700
x1668
76D
Plus and xor
dp
,
greedy
,
math
1700
x2012
76C
Mutation
bitmasks
,
dp
,
math
2700
x272
76B
Mice
greedy
,
two pointers
2100
x545
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1488
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x271
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1755
75C
Modified GCD
binary search
,
number theory
1600
x12190
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3239
75A
Life Without Zeros
implementation
1000
x25309
74E
Shift It!
constructive algorithms
2800
x148
74D
Hanger
data structures
2400
x364
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x1023
74B
Train
dp
,
games
,
greedy
1500
x1502
74A
Room Leader
implementation
1000
x4982
73F
Plane of Tanks
brute force
,
geometry
2900
x76
73E
Morrowindows
math
,
number theory
2400
x324
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x619
73C
LionAge II
dp
1800
x2072
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x492
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1308
72I
Goofy Numbers
*special problem
,
implementation
1500
x457
72H
Reverse It!
*special problem
,
implementation
1600
x261
72G
Fibonacci army
*special problem
,
dp
1000
x2066
72F
Oil
*special problem
,
greedy
,
math
1900
x117
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x151
72D
Perse-script
*special problem
,
expression parsing
2300
x73
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x909
72B
INI-file
*special problem
,
implementation
2200
x76
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x183
71E
Nuclear Fusion
bitmasks
,
dp
2200
x687
71D
Solitaire
brute force
,
implementation
2200
x610
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6289
71B
Progress Bar
implementation
,
math
1300
x4401
71A
Way Too Long Words
strings
800
x362061
70E
Information Reform
dp
,
implementation
,
trees
2700
x481
70D
Professor's task
data structures
,
geometry
2700
x967
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x562
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1728
70A
Cookies
math
1300
x3231
69E
Subsegments
data structures
,
implementation
1800
x4051
69D
Dot
dp
,
games
1900
x943
69C
Game
implementation
2000
x570
69B
Bets
greedy
,
implementation
1200
x3211
69A
Young Physicist
implementation
,
math
1000
x157985
68E
Contact
geometry
2900
x71
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x452
68C
Synchrophasotron
brute force
2200
x305
68B
Energy exchange
binary search
1600
x4189
68A
Irrational problem
implementation
,
number theory
1100
x4850
67E
Save the City!
geometry
2500
x313
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1347
67C
Sequence of Balls
dp
2600
x632
67B
Restoration of the Permutation
greedy
1800
x757
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2071
66E
Petya and Post
data structures
,
dp
2000
x687
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3076
66C
Petya and File System
data structures
,
implementation
1800
x1001
66B
Petya and Countryside
brute force
,
implementation
1100
x19775
66A
Petya and Java
implementation
,
strings
1300
x6257
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x89
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x421
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x773
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1323
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1787
64I
Sort the Table
*special problem
,
sortings
2400
x86
64H
Table Bowling
*special problem
,
sortings
2300
x111
64G
Path Canonization
*special problem
2200
x117
64F
Domain
*special problem
,
expression parsing
2000
x177
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x236
64D
Presents
*special problem
,
greedy
1800
x283
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x333
64B
Expression
*special problem
,
expression parsing
1500
x1003
64A
Factorial
*special problem
,
implementation
1300
x2730
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x717
63D
Dividing Island
constructive algorithms
1900
x1234
63C
Bulls and Cows
brute force
,
implementation
1700
x1648
63B
Settlers' Training
implementation
1200
x4740
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x11002
62E
World Evil
dp
,
flows
2700
x227
62D
Wormhouse
dfs and similar
,
graphs
2300
x350
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x248
62B
Tyndex.Brome
binary search
,
implementation
1800
x1267
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