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Problems
#
Name
1663E
Are You Safe?
*special problem
,
implementation
x544
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1392
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5628
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3365
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10421
1662O
Circular Maze
brute force
,
dfs and similar
,
graphs
,
implementation
x1279
1662N
Drone Photo
combinatorics
,
math
,
sortings
x697
1662M
Bottle Arrangements
constructive algorithms
x3318
1662L
Il Derby della Madonnina
data structures
,
dp
,
math
x999
1662K
Pandemic Restrictions
geometry
,
ternary search
x308
1662J
Training Camp
flows
,
graphs
x219
1662I
Ice Cream Shop
brute force
,
implementation
,
sortings
x1986
1662H
Boundary
brute force
,
math
x2816
1662G
Gastronomic Event
dp
,
greedy
,
trees
x449
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x974
1662E
Round Table
math
x128
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x1700
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x291
1662B
Toys
greedy
,
strings
x132
1662A
Organizing SWERC
brute force
,
implementation
x4196
1661F
Teleporters
binary search
,
greedy
2600
x561
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x918
1661D
Progressions Covering
data structures
,
greedy
1900
x4555
1661C
Water the Trees
binary search
,
greedy
,
math
1700
x9051
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17151
1661A
Array Balancing
greedy
,
math
800
x18229
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2622
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x7071
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x7041
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8275
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x18953
1660B
Vlad and Candies
math
800
x27664
1660A
Vasya and Coins
greedy
,
math
800
x35271
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x184
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1478
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3905
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9870
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10691
1659A
Red Versus Blue
constructive algorithms
,
greedy
,
implementation
,
math
1000
x17291
1658F
Juju and Binary String
brute force
,
constructive algorithms
,
greedy
,
math
2700
x732
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1027
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2453
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x8838
1658C
Shinju and the Lost Permutation
constructive algorithms
,
math
1700
x9145
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18424
1658A
Marin and Photoshoot
constructive algorithms
,
implementation
,
math
800
x20179
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x559
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x2000
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4738
1657C
Bracket Sequence Deletion
greedy
,
implementation
1200
x16586
1657B
XY Sequence
greedy
800
x22643
1657A
Integer Moves
brute force
,
math
800
x23755
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x98
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x420
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x274
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x1002
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3329
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6679
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18670
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17896
1656A
Good Pairs
math
,
sortings
800
x19436
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x71
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x358
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1064
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x2003
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2796
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13236
1654B
Prefix Removals
strings
800
x15521
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18465
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x364
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x502
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4882
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10530
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x19386
1651A
Playoff
implementation
800
x25429
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2352
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1393
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4039
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x12769
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16488
1650B
DIV + MOD
math
900
x27000
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x34063
1649B
Game of Ball Passing
greedy
,
implementation
1300
x12819
1649A
Game
implementation
800
x15421
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x105
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x387
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x812
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2883
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6244
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11974
1647F
Madoka and Laziness
dp
,
greedy
3100
x379
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x958
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5158
1647C
Madoka and Childish Pranks
constructive algorithms
,
greedy
1300
x12431
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15140
1647A
Madoka and Math Dad
implementation
,
math
800
x22549
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x407
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2315
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3579
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13414
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