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Codeforces Round 968 (Div. 2)
37:51:51
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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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Problems
#
Name
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x900
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x590
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4843
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12161
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x863
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1440
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8320
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15712
1615A
Closing The Gap
greedy
,
math
800
x20687
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10156
1613D
MEX Sequences
dp
,
math
1900
x4551
1613A
Long Comparison
implementation
,
math
900
x24335
1612D
X-Magic Pair
math
,
number theory
1600
x9061
1612C
Chat Ban
binary search
,
math
1300
x16895
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x29274
1611A
Make Even
constructive algorithms
,
math
800
x31245
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1659
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2678
1610A
Anti Light's Cell Guessing
math
900
x16028
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x390
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x16989
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1378
1608A
Find Array
constructive algorithms
,
math
800
x18988
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16738
1607B
Odd Grasshopper
math
900
x25843
1606E
Arena
combinatorics
,
dp
,
math
2100
x3471
1606B
Update Files
greedy
,
implementation
,
math
1100
x18589
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1019
1605A
A.M. Deviation
math
,
number theory
800
x20544
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x273
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x415
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x2018
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13414
1603A
Di-visible Confusion
constructive algorithms
,
math
,
number theory
1300
x16511
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x175
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x14259
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x476
1599H
Hidden Fortress
interactive
,
math
2100
x1040
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x368
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1637
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x330
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2280
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8571
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20587
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1329
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1470
1594E1
Rubik's Cube Coloring (easy version)
combinatorics
,
math
1300
x11029
1594C
Make Them Equal
brute force
,
greedy
,
math
,
strings
1200
x19006
1594B
Special Numbers
bitmasks
,
math
1100
x19726
1594A
Consecutive Sum Riddle
math
800
x24287
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2415
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4939
1593D1
All are Same
math
,
number theory
1100
x19976
1593B
Make it Divisible by 25
dfs and similar
,
dp
,
greedy
,
math
,
math
900
x26596
1593A
Elections
math
800
x36397
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1599
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2199
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15829
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x21987
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x191
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1198
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3813
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3635
1584C
Two Arrays
greedy
,
math
,
sortings
900
x16250
1584B
Coloring Rectangles
greedy
,
math
1000
x13276
1584A
Mathematical Addition
math
800
x14833
1583G
Omkar and Time Travel
data structures
,
math
3000
x447
1583A
Windblume Ode
math
,
number theory
800
x13694
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3689
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x10414
1582B
Luntik and Subsequences
combinatorics
,
math
900
x19988
1582A
Luntik and Concerts
math
800
x18449
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x11242
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13367
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x133
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4731
1579E1
Permutation Minimization by Deque
constructive algorithms
,
greedy
,
math
1000
x21414
1579A
Casimir's String Solitaire
math
,
strings
800
x38549
1578G
Game of Chance
math
,
probabilities
3500
x38
1578E
Easy Scheduling
implementation
,
math
1200
x3789
1575K
Knitting Batik
implementation
,
math
2200
x676
1575G
GCD Festival
math
,
number theory
2200
x668
1575F
Finding Expected Value
math
2900
x114
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x894
1574B
Combinatorics Homework
combinatorics
,
greedy
,
math
1100
x17230
1573B
Swaps
greedy
,
math
,
sortings
1400
x14435
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x328
1571B
Epic Novel
*special problem
,
math
1300
x705
1569C
Jury Meeting
combinatorics
,
math
1500
x11932
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3602
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4473
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x12082
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x129
1566A
Median Maximization
binary search
,
greedy
,
math
800
x23114
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x400
1562D2
Two Hundred Twenty One (hard version)
data structures
,
math
2200
x2104
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6282
1562C
Rings
constructive algorithms
,
math
1500
x13165
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19482
1562A
The Miracle and the Sleeper
greedy
,
math
800
x25417
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