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Before contest
Codeforces Round 950 (Div. 3)
39:33:38
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Difficulty:
—
greedy
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
1221A
2048 Game
brute force
,
greedy
,
math
1000
x16358
1220E
Tourism
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2200
x2687
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10063
1218I
The Light Square
2-sat
,
dfs and similar
,
greedy
2100
x573
1218F
Workout plan
data structures
,
greedy
1500
x2890
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1839
1217B
Zmei Gorynich
greedy
,
math
1600
x11058
1216F
Wi-Fi
data structures
,
dp
,
greedy
2100
x2348
1216B
Shooting
greedy
,
implementation
,
sortings
900
x18127
1215D
Ticket Game
games
,
greedy
,
math
1700
x5982
1215C
Swap Letters
constructive algorithms
,
greedy
1500
x10945
1215A
Yellow Cards
greedy
,
implementation
,
math
1000
x11417
1214F
Employment
greedy
,
sortings
2700
x425
1214C
Bad Sequence
data structures
,
greedy
1200
x13026
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2491
1211E
Double Permutation Inc.
*special problem
,
binary search
,
greedy
2000
x189
1211D
Teams
*special problem
,
binary search
,
greedy
,
math
2000
x225
1211C
Ice Cream
*special problem
,
greedy
,
sortings
1700
x480
1210B
Marcin and Training Camp
brute force
,
greedy
1700
x5672
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x138
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x3019
1209E2
Rotate Columns (hard version)
bitmasks
,
dp
,
greedy
,
sortings
2500
x1856
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2872
1209C
Paint the Digits
constructive algorithms
,
greedy
,
implementation
1500
x7373
1209A
Paint the Numbers
greedy
,
implementation
,
math
800
x12071
1208G
Polygons
greedy
,
math
,
number theory
2800
x731
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2122
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4797
1207C
Gas Pipeline
dp
,
greedy
1500
x9695
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x13087
1207A
There Are Two Types Of Burgers
brute force
,
greedy
,
implementation
,
math
800
x21506
1205A
Almost Equal
constructive algorithms
,
greedy
,
math
1200
x13967
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2984
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2863
1204C
Anna, Svyatoslav and Maps
dp
,
graphs
,
greedy
,
shortest paths
1700
x6585
1204B
Mislove Has Lost an Array
greedy
,
math
900
x17310
1203F2
Complete the Projects (hard version)
dp
,
greedy
2300
x2766
1203F1
Complete the Projects (easy version)
greedy
2100
x3416
1203E
Boxers
greedy
,
sortings
1500
x13592
1203D2
Remove the Substring (hard version)
binary search
,
greedy
,
implementation
,
two pointers
1700
x7191
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8603
1203B
Equal Rectangles
greedy
,
math
1200
x15720
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2488
1202A
You Are Given Two Binary Strings...
bitmasks
,
greedy
1100
x9032
1201D
Treasure Hunting
binary search
,
dp
,
greedy
,
implementation
2100
x2300
1201C
Maximum Median
binary search
,
greedy
,
math
,
sortings
1400
x21844
1201B
Zero Array
greedy
,
math
1500
x17946
1200B
Block Adventure
dp
,
greedy
1200
x13786
1198F
GCD Groups 2
greedy
,
number theory
,
probabilities
2900
x821
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x3426
1197D
Yet Another Subarray Problem
dp
,
greedy
,
math
1900
x5257
1197C
Array Splitting
greedy
,
sortings
1400
x13699
1197B
Pillars
greedy
,
implementation
1000
x13663
1197A
DIY Wooden Ladder
greedy
,
math
,
sortings
900
x13401
1195A
Drinks Choosing
greedy
,
math
1000
x12572
1190E
Tokitsukaze and Explosion
binary search
,
greedy
3100
x223
1190C
Tokitsukaze and Duel
brute force
,
games
,
greedy
2300
x1930
1189B
Number Circle
greedy
,
math
,
sortings
1100
x13851
1187C
Vasya And Array
constructive algorithms
,
greedy
,
implementation
1800
x6228
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x752
1186D
Vus the Cossack and Numbers
constructive algorithms
,
greedy
,
math
1500
x8861
1185C2
Exam in BerSU (hard version)
brute force
,
data structures
,
greedy
,
math
1700
x7190
1185C1
Exam in BerSU (easy version)
greedy
,
sortings
1200
x11103
1183G
Candy Box (hard version)
greedy
,
implementation
,
sortings
2000
x2303
1183D
Candy Box (easy version)
greedy
,
sortings
1400
x13466
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4384
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x265
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6201
1181A
Chunga-Changa
greedy
,
math
1000
x13186
1180B
Nick and Array
greedy
,
implementation
1500
x9432
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x1970
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4262
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7288
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x11468
1178A
Prime Minister
greedy
800
x10315
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5153
1176C
Lose it!
dp
,
greedy
,
implementation
1300
x13889
1176A
Divide it!
brute force
,
greedy
,
implementation
800
x21975
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3215
1175D
Array Splitting
greedy
,
sortings
1900
x5799
1175C
Electrification
binary search
,
brute force
,
greedy
1600
x6688
1174A
Ehab Fails to Be Thanos
constructive algorithms
,
greedy
,
sortings
1000
x17268
1173B
Nauuo and Chess
constructive algorithms
,
greedy
1100
x8827
1173A
Nauuo and Votes
greedy
800
x15957
1172A
Nauuo and Cards
greedy
,
implementation
1800
x4763
1170F
Wheels
*special problem
,
binary search
,
greedy
x116
1168A
Increasing by Modulo
binary search
,
greedy
1700
x6558
1167D
Bicolored RBS
constructive algorithms
,
greedy
1500
x6845
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x18852
1166D
Cute Sequences
binary search
,
brute force
,
greedy
,
math
2200
x2136
1166A
Silent Classroom
combinatorics
,
greedy
900
x14007
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2055
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1782
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x8005
1165C
Good String
greedy
1300
x12703
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20408
1163A
Eating Soup
greedy
,
math
900
x12784
1162B
Double Matrix
brute force
,
greedy
1400
x5774
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x665
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1712
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