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Before contest
Codeforces Round 1101 (Div. 2)
00:30:32
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Difficulty:
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constructive algorithms
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x5017
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x5518
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x10272
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x393
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2799
1245B
Restricted RPS
constructive algorithms
,
dp
,
greedy
1200
x14549
1244G
Running in Pairs
constructive algorithms
,
greedy
,
math
2400
x1547
1244F
Chips
constructive algorithms
,
implementation
2300
x1637
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x6468
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x8320
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x157
1242A
Tile Painting
constructive algorithms
,
math
,
number theory
1500
x13278
1237H
Balanced Reversals
constructive algorithms
3300
x438
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4536
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x6303
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x10559
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x934
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x479
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x5440
1227G
Not Same
constructive algorithms
2600
x1190
1227C
Messy
constructive algorithms
1700
x5796
1227B
Box
constructive algorithms
1200
x10445
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x661
1225F
Tree Factory
constructive algorithms
,
greedy
,
trees
2500
x995
1221B
Knights
constructive algorithms
,
greedy
1100
x12539
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x164
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x5973
1215C
Swap Letters
constructive algorithms
,
greedy
1500
x11969
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x461
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x2866
1213E
Two Small Strings
brute force
,
constructive algorithms
1900
x5476
1209C
Paint the Digits
constructive algorithms
,
greedy
,
implementation
1500
x7866
1208C
Magic Grid
constructive algorithms
1800
x6374
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x13779
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x140
1205D
Almost All
constructive algorithms
,
trees
2700
x768
1205A
Almost Equal
constructive algorithms
,
greedy
,
math
1200
x14725
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5469
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x4075
1196F
K-th Path
brute force
,
constructive algorithms
,
shortest paths
,
sortings
2200
x3191
1196E
Connected Component on a Chessboard
constructive algorithms
,
implementation
1800
x3919
1196B
Odd Sum Segments
constructive algorithms
,
math
1200
x17562
1196A
Three Piles of Candies
brute force
,
constructive algorithms
,
math
800
x29166
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x48
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1297
1187C
Vasya And Array
constructive algorithms
,
greedy
,
implementation
1800
x6789
1186D
Vus the Cossack and Numbers
constructive algorithms
,
greedy
,
math
1500
x9331
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x1018
1179B
Tolik and His Uncle
constructive algorithms
1800
x4600
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4510
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7933
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1972
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x5052
1174C
Ehab and a Special Coloring Problem
constructive algorithms
,
number theory
1300
x12807
1174A
Ehab Fails to Be Thanos
constructive algorithms
,
greedy
,
sortings
1000
x19254
1173B
Nauuo and Chess
constructive algorithms
,
greedy
1100
x9448
1172D
Nauuo and Portals
constructive algorithms
2900
x701
1170H
Longest Saw
*special problem
,
constructive algorithms
x57
1168E
Xor Permutations
constructive algorithms
,
math
3100
x432
1167D
Bicolored RBS
constructive algorithms
,
greedy
1500
x7376
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x3012
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11931
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x1016
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x927
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x2127
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2388
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x8376
1157G
Inverse of Rows and Columns
brute force
,
constructive algorithms
2200
x1010
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2889
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x4004
1153B
Serval and Toy Bricks
constructive algorithms
,
greedy
1200
x9410
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x1123
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x9353
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5610
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x12912
1149A
Prefix Sum Primes
constructive algorithms
,
greedy
,
math
,
number theory
1200
x17965
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x390
1148F
Foo Fighters
bitmasks
,
constructive algorithms
2700
x1135
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1827
1148C
Crazy Diamond
constructive algorithms
,
sortings
1700
x5633
1144D
Equalize Them All
constructive algorithms
,
greedy
1400
x10853
1144C
Two Shuffled Sequences
constructive algorithms
,
sortings
1000
x16410
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2550
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x2169
1136C
Nastya Is Transposing Matrices
constructive algorithms
,
sortings
1500
x8034
1136B
Nastya Is Playing Computer Games
constructive algorithms
,
math
1000
x12284
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3838
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x7782
1129B
Wrong Answer
constructive algorithms
2000
x2331
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x480
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x571
1119C
Ramesses and Corner Inversion
constructive algorithms
,
greedy
,
implementation
,
math
1500
x7182
1118E
Yet Another Ball Problem
constructive algorithms
,
implementation
1700
x4461
1118C
Palindromic Matrix
constructive algorithms
,
implementation
1700
x6103
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1646
1114B
Yet Another Array Partitioning Task
constructive algorithms
,
greedy
,
sortings
1500
x9404
1110G
Tree-Tac-Toe
constructive algorithms
,
games
,
trees
3100
x754
1110E
Magic Stones
constructive algorithms
,
math
,
sortings
2200
x4743
1110C
Meaningless Operations
constructive algorithms
,
math
,
number theory
1500
x10029
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4546
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