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2023 Post World Finals Online ICPC Challenge powered by Huawei
11 days
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Codeforces Round 944 (Div. 4)
21:29:27
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combine-tags-by-or
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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
#
Name
78A
Haiku
implementation
,
strings
800
x11956
77E
Martian Food
geometry
2800
x363
77D
Domino Carpet
dp
,
implementation
2300
x309
77C
Beavermuncher-0xFF
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2100
x977
77B
Falling Anvils
math
,
probabilities
1800
x2543
77A
Heroes
brute force
,
implementation
1400
x1746
76F
Tourist
binary search
,
data structures
,
dp
2300
x602
76E
Points
implementation
,
math
1700
x1658
76D
Plus and xor
dp
,
greedy
,
math
1700
x1992
76C
Mutation
bitmasks
,
dp
,
math
2700
x269
76B
Mice
greedy
,
two pointers
2100
x495
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1448
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x270
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1731
75C
Modified GCD
binary search
,
number theory
1600
x12001
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3212
75A
Life Without Zeros
implementation
1000
x25004
74E
Shift It!
constructive algorithms
2800
x142
74D
Hanger
data structures
2400
x359
74C
Chessboard Billiard
dfs and similar
,
dsu
,
graphs
,
number theory
2100
x949
74B
Train
dp
,
games
,
greedy
1500
x1491
74A
Room Leader
implementation
1000
x4936
73F
Plane of Tanks
brute force
,
geometry
2900
x74
73E
Morrowindows
math
,
number theory
2400
x322
73D
FreeDiv
dfs and similar
,
graphs
,
greedy
2200
x612
73C
LionAge II
dp
1800
x2053
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x488
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1297
72I
Goofy Numbers
*special problem
,
implementation
1500
x455
72H
Reverse It!
*special problem
,
implementation
1600
x258
72G
Fibonacci army
*special problem
,
dp
1000
x2047
72F
Oil
*special problem
,
greedy
,
math
1900
x116
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x150
72D
Perse-script
*special problem
,
expression parsing
2300
x72
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x901
72B
INI-file
*special problem
,
implementation
2200
x75
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x181
71E
Nuclear Fusion
bitmasks
,
dp
2200
x670
71D
Solitaire
brute force
,
implementation
2200
x600
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6230
71B
Progress Bar
implementation
,
math
1300
x4361
71A
Way Too Long Words
strings
800
x353957
70E
Information Reform
dp
,
implementation
,
trees
2700
x477
70D
Professor's task
data structures
,
geometry
2700
x951
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x561
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1717
70A
Cookies
math
1300
x3219
69E
Subsegments
data structures
,
implementation
1800
x4032
69D
Dot
dp
,
games
1900
x931
69C
Game
implementation
2000
x558
69B
Bets
greedy
,
implementation
1200
x3189
69A
Young Physicist
implementation
,
math
1000
x155169
68E
Contact
geometry
2900
x70
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x448
68C
Synchrophasotron
brute force
2200
x303
68B
Energy exchange
binary search
1600
x4138
68A
Irrational problem
implementation
,
number theory
1100
x4816
67E
Save the City!
geometry
2500
x312
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1336
67C
Sequence of Balls
dp
2600
x627
67B
Restoration of the Permutation
greedy
1800
x755
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2055
66E
Petya and Post
data structures
,
dp
2000
x684
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3053
66C
Petya and File System
data structures
,
implementation
1800
x997
66B
Petya and Countryside
brute force
,
implementation
1100
x19492
66A
Petya and Java
implementation
,
strings
1300
x6213
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x84
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x420
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x772
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1319
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1782
64I
Sort the Table
*special problem
,
sortings
2400
x84
64H
Table Bowling
*special problem
,
sortings
2300
x109
64G
Path Canonization
*special problem
2200
x116
64F
Domain
*special problem
,
expression parsing
2000
x175
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x234
64D
Presents
*special problem
,
greedy
1800
x281
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x331
64B
Expression
*special problem
,
expression parsing
1500
x997
64A
Factorial
*special problem
,
implementation
1300
x2700
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x714
63D
Dividing Island
constructive algorithms
1900
x1210
63C
Bulls and Cows
brute force
,
implementation
1700
x1624
63B
Settlers' Training
implementation
1200
x4709
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10875
62E
World Evil
dp
,
flows
2700
x218
62D
Wormhouse
dfs and similar
,
graphs
2300
x348
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
62B
Tyndex.Brome
binary search
,
implementation
1800
x1263
62A
A Student's Dream
greedy
,
math
1300
x3364
61E
Enemy is weak
data structures
,
trees
1900
x10081
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6243
61C
Capture Valerian
math
2000
x692
61B
Hard Work
strings
1300
x3782
61A
Ultra-Fast Mathematician
implementation
800
x103707
60E
Mushroom Gnomes
math
,
matrices
2600
x316
60D
Savior
brute force
,
dsu
,
math
2500
x395
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x549
60B
Serial Time!
dfs and similar
,
dsu
1400
x4439
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