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Before contest
Codeforces Round 973 (Div. 2)
29:38:55
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Difficulty:
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math
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
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x368
1418A
Buying Torches
math
1000
x22917
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14454
1417A
Copy-paste
greedy
,
math
800
x18224
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4397
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x6108
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2707
1415A
Prison Break
brute force
,
math
800
x15149
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x2009
1413A
Finding Sasuke
constructive algorithms
,
math
800
x14750
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x660
1411F
The Thorny Path
greedy
,
math
3000
x371
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1631
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19337
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x23258
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x28913
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x65932
1408I
Bitwise Magic
dp
,
math
3200
x174
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8832
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9935
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11963
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16986
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20410
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1612
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3486
1406A
Subset Mex
greedy
,
implementation
,
math
900
x21406
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x1072
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x51
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1185
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9287
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x24203
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x21068
1401A
Distance and Axis
constructive algorithms
,
math
900
x27410
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x955
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x10229
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11169
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x1082
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2416
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x26184
1398A
Bad Triangle
geometry
,
math
800
x27491
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14679
1395A
Boboniu Likes to Color Balls
brute force
,
math
1000
x24069
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10603
1393A
Rainbow Dash, Fluttershy and Chess Coloring
greedy
,
math
800
x20498
1392I
Kevin and Grid
fft
,
graphs
,
math
3300
x204
1392H
ZS Shuffles Cards
combinatorics
,
dp
,
math
,
probabilities
3000
x704
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x486
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x2141
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3522
1392B
Omkar and Infinity Clock
implementation
,
math
800
x18468
1392A
Omkar and Password
greedy
,
math
800
x20574
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14987
1391A
Suborrays
constructive algorithms
,
math
800
x24350
1389E
Calendar Ambiguity
math
,
number theory
2200
x3436
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4304
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x40993
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9701
1388B
Captain Flint and a Long Voyage
greedy
,
math
1000
x22263
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24897
1387A
Graph
*special problem
,
binary search
,
dfs and similar
,
dp
,
math
,
ternary search
2100
x711
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x121
1385A
Three Pairwise Maximums
math
800
x39006
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x5041
1381E
Origami
geometry
,
math
,
sortings
3300
x267
1380G
Circular Dungeon
greedy
,
math
,
probabilities
2600
x790
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4688
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x426
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12637
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x265
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x2228
1375A
Sign Flipping
constructive algorithms
,
math
1100
x18337
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x23646
1374B
Multiply by 2, divide by 6
math
900
x49854
1374A
Required Remainder
math
800
x53487
1373C
Pluses and Minuses
math
1300
x18336
1373A
Donut Shops
greedy
,
implementation
,
math
1000
x26911
1372C
Omkar and Baseball
constructive algorithms
,
math
1500
x17791
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x27847
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2338
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x5222
1371C
A Cookie for You
greedy
,
implementation
,
math
1300
x20504
1371B
Magical Calendar
math
1200
x19138
1371A
Magical Sticks
math
800
x45875
1370C
Number Game
games
,
math
,
number theory
1400
x24491
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x23648
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x51721
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8597
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19550
1369A
FashionabLee
geometry
,
math
800
x36448
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x1038
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11764
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19669
1368A
C+=
brute force
,
greedy
,
implementation
,
math
800
x39045
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x23438
1367B
Even Array
greedy
,
math
800
x53265
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x10458
1366C
Palindromic Paths
greedy
,
math
1500
x13556
1366B
Shuffle
math
,
two pointers
1300
x20916
1366A
Shovels and Swords
binary search
,
greedy
,
math
1100
x29990
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x1159
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