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Codeforces Round 973 (Div. 2)
21:58:14
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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
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Status
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Custom test
Problems
#
Name
147A
Punctuation
implementation
,
strings
1300
x3619
146B
Lucky Mask
brute force
,
implementation
1300
x4342
146A
Lucky Ticket
implementation
800
x15017
145E
Lucky Queries
data structures
2400
x3114
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x242
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1906
145B
Lucky Number 2
constructive algorithms
1800
x2195
145A
Lucky Conversion
greedy
,
implementation
1200
x7120
144E
Competition
data structures
,
greedy
2200
x581
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3943
144C
Anagram Search
implementation
,
strings
1500
x3992
144B
Meeting
implementation
1300
x5222
144A
Arrival of the General
implementation
800
x95020
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4978
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13755
142E
Help Greg the Dwarf 2
geometry
3000
x80
142D
Help Shrek and Donkey 2
games
2600
x347
142C
Help Caretaker
brute force
,
dp
2300
x913
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2201
142A
Help Farmer
brute force
,
math
1600
x2605
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1067
141D
Take-off Ramps
graphs
,
shortest paths
2300
x894
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2425
141B
Hopscotch
geometry
,
math
1400
x5326
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x82210
140F
New Year Snowflake
geometry
,
sortings
2600
x367
140E
New Year Garland
combinatorics
,
dp
2600
x937
140D
New Year Contest
greedy
,
sortings
1800
x2204
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4349
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1675
140A
New Year Table
geometry
,
math
1700
x4131
139B
Wallpaper
implementation
,
math
1600
x1293
139A
Petr and Book
implementation
1000
x30798
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x173
138D
World of Darkraft
dp
,
games
2500
x491
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x870
138B
Digits Permutations
greedy
1900
x1025
138A
Literature Lesson
implementation
1600
x2381
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1213
137D
Palindromes
dp
,
strings
1900
x1508
137C
History
sortings
1500
x7178
137B
Permutation
greedy
1000
x13625
137A
Postcards and photos
implementation
900
x7114
136B
Ternary Logic
implementation
,
math
1100
x4845
136A
Presents
implementation
800
x116297
135E
Weak Subsequence
combinatorics
3000
x286
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x299
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1335
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2338
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7525
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x471
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2012
134A
Average Numbers
brute force
,
implementation
1200
x3941
133B
Unary
implementation
1200
x8787
133A
HQ9+
implementation
900
x104561
132E
Bits of merry old England
flows
,
graphs
2700
x533
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x613
132C
Logo Turtle
dp
1800
x2311
132B
Piet
implementation
2100
x663
132A
Turing Tape
implementation
1300
x2769
131F
Present to Mom
binary search
,
two pointers
2000
x641
131E
Yet Another Task with Queens
sortings
1700
x1840
131D
Subway
dfs and similar
,
graphs
1600
x4650
131C
The World is a Theatre
combinatorics
,
math
1400
x11048
131B
Opposites Attract
implementation
,
math
1200
x7021
131A
cAPS lOCK
implementation
,
strings
1000
x84937
130J
Date calculation
*special problem
1800
x332
130I
Array sorting
*special problem
,
sortings
2300
x167
130H
Balanced brackets
*special problem
1600
x591
130G
CAPS LOCK ON
*special problem
1700
x284
130F
Prime factorization
*special problem
1600
x277
130E
Tribonacci numbers
*special problem
1600
x296
130D
Exponentiation
*special problem
1500
x393
130C
Decimal sum
*special problem
1500
x495
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x528
130A
Hexagonal numbers
*special problem
,
implementation
900
x1616
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12117
129A
Cookies
implementation
900
x22459
128E
Birthday
geometry
,
math
2900
x97
128D
Numbers
constructive algorithms
,
implementation
2000
x1133
128C
Games with Rectangle
combinatorics
,
dp
2000
x2915
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2538
128A
Statues
dfs and similar
1500
x3176
127B
Canvas Frames
implementation
1000
x8673
127A
Wasted Time
geometry
900
x11143
126E
Pills
brute force
,
flows
2900
x83
126D
Fibonacci Sums
dp
,
math
2300
x828
126C
E-reader Display
constructive algorithms
,
greedy
2000
x723
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19218
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1429
125E
MST Company
binary search
,
graphs
2400
x1065
125D
Two progressions
constructive algorithms
,
greedy
2200
x400
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x915
125B
Simple XML
implementation
1000
x2867
125A
Measuring Lengths in Baden
math
1400
x2708
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3883
124A
The number of positions
math
1000
x38062
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x716
123D
String
string suffix structures
2300
x1211
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x603
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