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Before contest
Codeforces Round (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
1658A
Marin and Photoshoot
constructive algorithms
,
implementation
,
math
800
x20317
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x577
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x2093
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4861
1657C
Bracket Sequence Deletion
greedy
,
implementation
1200
x16816
1657B
XY Sequence
greedy
800
x22804
1657A
Integer Moves
brute force
,
math
800
x23970
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x104
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x575
1656G
Cycle Palindrome
constructive algorithms
,
graphs
,
math
3200
x385
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x1037
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3445
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6867
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x19163
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x18898
1656A
Good Pairs
math
,
sortings
800
x19585
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x76
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x394
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1199
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x2090
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2845
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13487
1654B
Prefix Removals
strings
800
x15623
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18654
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x380
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x519
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x5126
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10707
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x19571
1651A
Playoff
implementation
800
x25668
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2483
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1456
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4143
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x13029
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16740
1650B
DIV + MOD
math
900
x27660
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x34705
1649B
Game of Ball Passing
greedy
,
implementation
1300
x13030
1649A
Game
implementation
800
x15531
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x134
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x402
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x882
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2984
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6438
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x12840
1647F
Madoka and Laziness
dp
,
greedy
3100
x455
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x992
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5281
1647C
Madoka and Childish Pranks
constructive algorithms
,
greedy
1300
x12594
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15392
1647A
Madoka and Math Dad
implementation
,
math
800
x22760
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x525
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2436
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3744
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x14127
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x21154
1646A
Square Counting
math
800
x24284
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x326
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3099
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x7237
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x13772
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20673
1644A
Doors and Keys
implementation
800
x27345
1642B
Power Walking
greedy
900
x16933
1642A
Hard Way
geometry
800
x16202
1641F
Covering Circle
geometry
3500
x99
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x208
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1161
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2428
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3813
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x17900
1639K
Treasure Hunt
graphs
,
interactive
1639J
Treasure Hunt
graphs
,
interactive
1639I
Treasure Hunt
graphs
,
interactive
1639H
Treasure Hunt
graphs
,
interactive
1639G
Treasure Hunt
graphs
,
interactive
1639F
Treasure Hunt
graphs
,
interactive
1639E
Treasure Hunt
graphs
,
interactive
1639D
Treasure Hunt
graphs
,
interactive
1639C
Treasure Hunt
graphs
,
interactive
1639B
Treasure Hunt
graphs
,
interactive
1639A
Treasure Hunt
graphs
,
interactive
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x226
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1910
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4200
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14682
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20851
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x21459
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x315
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x503
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1774
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3343
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7719
1637C
Andrew and Stones
greedy
,
implementation
1200
x17736
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x14804
1637A
Sorting Parts
brute force
,
sortings
800
x22298
1635F
Closest Pair
data structures
,
greedy
2800
x1106
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2222
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6254
1635C
Differential Sorting
constructive algorithms
,
greedy
1200
x17573
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