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Codeforces Round 972 (Div. 2)
32:31:53
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Difficulty:
—
implementation
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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Custom test
Problems
#
Name
1271D
Portals
data structures
,
dp
,
greedy
,
implementation
,
sortings
2100
x3032
1271C
Shawarma Tent
brute force
,
geometry
,
greedy
,
implementation
1300
x10502
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8606
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
1800
x2804
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x883
1266E
Spaceship Solitaire
data structures
,
greedy
,
implementation
2100
x2228
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3617
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12561
1264A
Beautiful Regional Contest
greedy
,
implementation
1500
x10049
1263E
Editor
data structures
,
implementation
2100
x2782
1263B
PIN Codes
greedy
,
implementation
1400
x11351
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15907
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6696
1255B
Fridge Lockers
graphs
,
implementation
1100
x11932
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x5169
1253B
Silly Mistake
greedy
,
implementation
1400
x11171
1253A
Single Push
implementation
1000
x18022
1252H
Twin Buildings
greedy
,
implementation
1800
x2623
1252C
Even Path
data structures
,
implementation
1600
x3714
1250F
Data Center
brute force
,
implementation
800
x7258
1250E
The Coronation
graphs
,
implementation
2300
x810
1250A
Berstagram
implementation
1400
x4075
1249C1
Good Numbers (easy version)
brute force
,
greedy
,
implementation
1300
x15488
1248D1
The World Is Just a Programming Task (Easy Version)
brute force
,
dp
,
greedy
,
implementation
2000
x2378
1244F
Chips
constructive algorithms
,
implementation
2300
x1524
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7540
1244B
Rooms and Staircases
brute force
,
implementation
1000
x15723
1243A
Maximum Square
implementation
800
x15625
1239F
Swiper, no swiping!
graphs
,
implementation
3400
x266
1239E
Turtle
dp
,
implementation
3100
x934
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1336
1239B
The World Is Just a Programming Task (Hard Version)
implementation
2500
x1041
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x4177
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4328
1237A
Balanced Rating Changes
implementation
,
math
1000
x19677
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1664
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x10141
1234C
Pipes
dp
,
implementation
1500
x12550
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16866
1234B1
Social Network (easy version)
implementation
1000
x18715
1230B
Ania and Minimizing
greedy
,
implementation
1000
x18648
1230A
Dawid and Bags of Candies
brute force
,
implementation
800
x21472
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x437
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x5199
1228B
Filling the Grid
implementation
,
math
1400
x11499
1228A
Distinct Digits
brute force
,
implementation
800
x21627
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10565
1225B1
TV Subscriptions (Easy Version)
implementation
1000
x11870
1220A
Cards
implementation
,
sortings
,
strings
800
x29591
1219G
Harvester
implementation
2000
x652
1219C
Periodic integer number
implementation
,
strings
1700
x1777
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1875
1216B
Shooting
greedy
,
implementation
,
sortings
900
x18355
1215B
The Number of Products
combinatorics
,
dp
,
implementation
1400
x12855
1215A
Yellow Cards
greedy
,
implementation
,
math
1000
x11516
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2579
1213D1
Equalizing by Division (easy version)
brute force
,
implementation
1500
x11362
1213B
Bad Prices
data structures
,
implementation
1100
x26469
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x124
1211B
Traveling Around the Golden Ring of Berland
*special problem
,
implementation
1500
x763
1211A
Three Problems
*special problem
,
implementation
1000
x1395
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x3200
1209C
Paint the Digits
constructive algorithms
,
greedy
,
implementation
1500
x7477
1209B
Koala and Lights
implementation
,
math
,
number theory
1300
x8147
1209A
Paint the Numbers
greedy
,
implementation
,
math
800
x12182
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x151
1208E
Let Them Slide
data structures
,
implementation
2200
x2033
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4893
1208B
Uniqueness
binary search
,
brute force
,
implementation
,
two pointers
1500
x10343
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x5199
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x13229
1207A
There Are Two Types Of Burgers
brute force
,
greedy
,
implementation
,
math
800
x21708
1206B
Make Product Equal One
dp
,
implementation
900
x26786
1205C
Palindromic Paths
implementation
,
interactive
2400
x1160
1203D2
Remove the Substring (hard version)
binary search
,
greedy
,
implementation
,
two pointers
1700
x7334
1203D1
Remove the Substring (easy version)
greedy
,
implementation
1600
x8727
1203C
Common Divisors
implementation
,
math
1300
x20463
1203A
Circle of Students
implementation
1000
x16667
1202F
You Are Given Some Letters...
binary search
,
implementation
,
math
2700
x394
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2528
1201D
Treasure Hunting
binary search
,
dp
,
greedy
,
implementation
2100
x2352
1201A
Important Exam
implementation
,
strings
900
x15589
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x1068
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7597
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4118
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x20301
1199A
City Day
implementation
1000
x14750
1197B
Pillars
greedy
,
implementation
1000
x13783
1196E
Connected Component on a Chessboard
constructive algorithms
,
implementation
1800
x3721
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9693
1196D1
RGB Substring (easy version)
implementation
1500
x10501
1196C
Robot Breakout
implementation
1500
x9317
1194C
From S To T
implementation
,
strings
1300
x13137
1194B
Yet Another Crosses Problem
implementation
1300
x10287
1191B
Tokitsukaze and Mahjong
brute force
,
implementation
1200
x9594
1190A
Tokitsukaze and Discard Items
implementation
,
two pointers
1400
x9342
1189C
Candies!
data structures
,
dp
,
implementation
,
math
1400
x10553
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1230
1187C
Vasya And Array
constructive algorithms
,
greedy
,
implementation
1800
x6343
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12171
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