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Before contest
Codeforces Round 968 (Div. 2)
06:58:22
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Difficulty:
—
constructive algorithms
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
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6309
1290D
Coffee Varieties (hard version)
constructive algorithms
,
graphs
,
interactive
3000
x820
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5316
1288F
Red-Blue Graph
constructive algorithms
,
flows
2900
x507
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x243
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x632
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1420
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4664
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1822
1283F
DIY Garland
constructive algorithms
,
greedy
,
trees
2200
x1837
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13084
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x1139
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2225
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x60
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1911
1276E
Four Stones
constructive algorithms
3500
x86
1276C
Beautiful Rectangle
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
greedy
,
math
2300
x1652
1272B
Snow Walking Robot
constructive algorithms
,
greedy
,
implementation
1200
x13851
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x236
1270G
Subset with Zero Sum
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x2208
1270E
Divide Points
constructive algorithms
,
geometry
,
math
2300
x2368
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4665
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x14007
1270B
Interesting Subarray
constructive algorithms
,
greedy
,
math
1200
x16304
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8534
1267L
Lexicography
constructive algorithms
,
strings
1800
x3018
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x875
1267H
Help BerLine
constructive algorithms
3200
x146
1267D
DevOps Best Practices
constructive algorithms
2800
x209
1267C
Cactus Revenge
constructive algorithms
3500
x380
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3608
1266C
Diverse Matrix
constructive algorithms
,
greedy
,
math
,
number theory
1400
x9669
1266B
Dice Tower
constructive algorithms
,
math
1000
x14896
1265A
Beautiful String
constructive algorithms
,
greedy
1000
x15044
1264F
Beautiful Fibonacci Problem
constructive algorithms
,
number theory
3500
x921
1264E
Beautiful League
constructive algorithms
,
flows
,
graph matchings
2700
x796
1264B
Beautiful Sequence
brute force
,
constructive algorithms
,
greedy
1900
x5780
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3283
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6688
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1412
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x3139
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4618
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x5166
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x9161
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x358
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2598
1245B
Restricted RPS
constructive algorithms
,
dp
,
greedy
1200
x13737
1244G
Running in Pairs
constructive algorithms
,
greedy
,
math
2400
x1340
1244F
Chips
constructive algorithms
,
implementation
2300
x1522
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5037
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7507
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x130
1242A
Tile Painting
constructive algorithms
,
math
,
number theory
1500
x12544
1237H
Balanced Reversals
constructive algorithms
3300
x370
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4296
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x6057
1236C
Labs
constructive algorithms
,
greedy
,
implementation
1300
x10097
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x831
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x435
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x5184
1227G
Not Same
constructive algorithms
2600
x1014
1227C
Messy
constructive algorithms
1700
x5506
1227B
Box
constructive algorithms
1200
x9593
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x537
1225F
Tree Factory
constructive algorithms
,
greedy
,
trees
2500
x881
1221B
Knights
constructive algorithms
,
greedy
1100
x11852
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x96
1217D
Coloring Edges
constructive algorithms
,
dfs and similar
,
graphs
2100
x5219
1215C
Swap Letters
constructive algorithms
,
greedy
1500
x11061
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x381
1214E
Petya and Construction Set
constructive algorithms
,
graphs
,
math
,
sortings
,
trees
2000
x2680
1213E
Two Small Strings
brute force
,
constructive algorithms
1900
x5135
1209C
Paint the Digits
constructive algorithms
,
greedy
,
implementation
1500
x7470
1208C
Magic Grid
constructive algorithms
1800
x5987
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x13213
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x122
1205D
Almost All
constructive algorithms
,
trees
2700
x639
1205A
Almost Equal
constructive algorithms
,
greedy
,
math
1200
x14070
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5073
1198C
Matching vs Independent Set
constructive algorithms
,
graphs
,
greedy
,
sortings
2000
x3528
1196F
K-th Path
brute force
,
constructive algorithms
,
shortest paths
,
sortings
2200
x2608
1196E
Connected Component on a Chessboard
constructive algorithms
,
implementation
1800
x3716
1196B
Odd Sum Segments
constructive algorithms
,
math
1200
x16501
1196A
Three Piles of Candies
brute force
,
constructive algorithms
,
math
800
x27575
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x38
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1224
1187C
Vasya And Array
constructive algorithms
,
greedy
,
implementation
1800
x6320
1186D
Vus the Cossack and Numbers
constructive algorithms
,
greedy
,
math
1500
x8908
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x822
1179B
Tolik and His Uncle
constructive algorithms
1800
x4345
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4295
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7364
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1694
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4672
1174C
Ehab and a Special Coloring Problem
constructive algorithms
,
number theory
1300
x11940
1174A
Ehab Fails to Be Thanos
constructive algorithms
,
greedy
,
sortings
1000
x17518
1173B
Nauuo and Chess
constructive algorithms
,
greedy
1100
x9052
1172D
Nauuo and Portals
constructive algorithms
2900
x492
1170H
Longest Saw
*special problem
,
constructive algorithms
x47
1168E
Xor Permutations
constructive algorithms
,
math
3100
x372
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