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Before contest
Codeforces Round #717 (Div. 2)
18:27:54
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Difficulty:
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sortings
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
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
x144
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
probabilities
,
sortings
x1636
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x394
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x753
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x2293
1508E
Tree Calendar
brute force
,
constructive algorithms
,
dfs and similar
,
sortings
,
trees
x99
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
x135
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x1914
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x517
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x1868
1501B
Napoleon Cake
dp
,
implementation
,
sortings
900
x10242
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x163
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1251
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x16497
1495A
Diamond Miner
geometry
,
greedy
,
math
,
sortings
1200
x11312
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x1695
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x2891
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x8007
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x2953
1487A
Arena
implementation
,
sortings
800
x18729
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x10026
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1088
1480B
The Great Hero
greedy
,
implementation
,
sortings
900
x12415
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x6557
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x1574
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x178
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x1592
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x3639
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x7789
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x6039
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x7898
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x22530
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2109
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x5011
1472D
Even-Odd Game
dp
,
games
,
greedy
,
sortings
1200
x15107
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x13008
1468D
Firecrackers
binary search
,
sortings
1700
x2580
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2323
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x8190
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x958
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x5438
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x8051
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x5967
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x8041
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1113
1452B
Toy Blocks
binary search
,
greedy
,
math
,
sortings
1400
x9673
1450A
Avoid Trygub
constructive algorithms
,
sortings
800
x14354
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x9592
1445A
Array Rearrangment
greedy
,
sortings
800
x14967
1444B
Divide and Sum
combinatorics
,
math
,
sortings
1900
x4381
1443C
The Delivery Dilemma
binary search
,
greedy
,
sortings
1400
x9150
1443B
Saving the City
dp
,
greedy
,
math
,
sortings
1300
x10274
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x12581
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x6653
1430B
Barrels
greedy
,
implementation
,
sortings
800
x15132
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x2603
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x7763
1427A
Avoiding Zero
math
,
sortings
900
x12505
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x9430
1424M
Ancient Language
graphs
,
sortings
2200
x373
1424G
Years
data structures
,
sortings
1300
x2696
1422D
Returning Home
graphs
,
shortest paths
,
sortings
2300
x1918
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x5075
1420A
Cubes Sorting
math
,
sortings
900
x16854
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x9800
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x14838
1418B
Negative Prefixes
greedy
,
sortings
1300
x11980
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x10844
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x2521
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x4036
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x5420
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1405
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x3150
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x14522
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x207
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x70
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x738
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x1581
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x6311
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x15784
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1055
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x1647
1399A
Remove Smallest
greedy
,
sortings
800
x32914
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x1715
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x7906
1398B
Substring Removal Game
games
,
greedy
,
sortings
800
x19787
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x10736
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x164
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x352
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x4992
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x8033
1389F
Bicolored Segments
data structures
,
dp
,
graph matchings
,
sortings
2600
x627
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x286
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x76
1383D
Rearrange
brute force
,
constructive algorithms
,
graphs
,
greedy
,
sortings
2800
x386
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x7952
1381E
Origami
geometry
,
math
,
sortings
3300
x62
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1100
1380C
Create The Teams
brute force
,
dp
,
greedy
,
implementation
,
sortings
1400
x12267
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x798
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