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Before contest
Codeforces Round 1101 (Div. 2)
01:48:46
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Difficulty:
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constructive algorithms
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
2162F
Beautiful Intervals
constructive algorithms
,
greedy
2100
x2948
2162E
Beautiful Palindromes
constructive algorithms
,
greedy
,
schedules
1600
x9473
2162C
Beautiful XOR
bitmasks
,
constructive algorithms
,
greedy
1100
x21574
2162B
Beautiful String
brute force
,
constructive algorithms
1000
x28170
2161C
Loyalty
constructive algorithms
,
greedy
,
sortings
,
two pointers
1200
x12785
2159A
MAD Interactive Problem
constructive algorithms
,
implementation
,
interactive
1700
x8378
2158F2
Distinct GCDs (Hard Version)
combinatorics
,
constructive algorithms
,
graphs
,
math
,
number theory
,
number theory
3000
x261
2158F1
Distinct GCDs (Easy Version)
constructive algorithms
,
graphs
,
math
,
number theory
2600
x418
2158D
Palindrome Flipping
brute force
,
constructive algorithms
,
graphs
,
implementation
,
shortest paths
,
strings
2000
x3339
2158B
Split
constructive algorithms
,
greedy
,
math
1200
x14198
2158A
Suspension
constructive algorithms
,
greedy
,
math
800
x23640
2157H
Keygen 3
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
3200
x133
2157G
Isaac's Queries
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
interactive
,
math
,
probabilities
2800
x460
2157F
Git Gud
brute force
,
constructive algorithms
,
divide and conquer
,
math
,
ternary search
2400
x1370
2157C
Meximum Array 2
constructive algorithms
,
greedy
,
implementation
,
math
1400
x9711
2156D
Find the Last Number
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1900
x5424
2156A
Pizza Time
brute force
,
constructive algorithms
,
greedy
800
x27067
2155D
Batteries
brute force
,
constructive algorithms
,
graph matchings
,
graphs
,
interactive
,
math
1800
x5959
2155B
Abraham's Great Escape
constructive algorithms
,
graphs
1100
x17215
2154F1
Bombing (Easy Version)
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
2700
x572
2154D
Catshock
constructive algorithms
,
dfs and similar
,
graphs
,
trees
,
two pointers
1900
x4828
2154B
Make it Zigzag
constructive algorithms
,
greedy
1000
x20044
2153C
Symmetrical Polygons
constructive algorithms
,
geometry
,
greedy
,
implementation
,
sortings
1500
x11924
2152E
Monotone Subsequence
constructive algorithms
,
graphs
,
greedy
,
interactive
,
math
2100
x3062
2150F
Cycle Closing
constructive algorithms
,
graphs
,
implementation
,
shortest paths
,
trees
3000
x205
2148D
Destruction of the Dandelion Fields
constructive algorithms
,
greedy
,
sortings
1000
x27039
2147I2
Longest Increasing Path (Hard Version)
constructive algorithms
,
math
3500
x108
2147I1
Longest Increasing Path (Easy Version)
constructive algorithms
,
math
3300
x136
2147H
Maxflow GCD Coloring
constructive algorithms
,
flows
,
graphs
3500
x235
2147C
Rabbits
constructive algorithms
,
dp
,
greedy
,
implementation
1500
x10122
2147B
Multiple Construction
constructive algorithms
1000
x17395
2147A
Shortest Increasing Path
constructive algorithms
,
greedy
800
x19007
2146E
Yet Another MEX Problem
brute force
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
hashing
2300
x2090
2146D2
Max Sum OR (Hard Version)
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
2000
x4110
2146D1
Max Sum OR (Easy Version)
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
trees
1500
x10672
2146C
Wrong Binary Search
binary search
,
constructive algorithms
1300
x13498
2145D
Inversion Value of a Permutation
constructive algorithms
,
dfs and similar
,
dp
1800
x6757
2144F
Bracket Groups
brute force
,
constructive algorithms
,
dp
,
string suffix structures
,
strings
2700
x966
2144B
Maximum Cost Permutation
constructive algorithms
,
greedy
1000
x18710
2144A
Cut the Array
brute force
,
constructive algorithms
,
math
,
number theory
800
x21858
2143E
Make Good
constructive algorithms
,
greedy
,
math
,
strings
2400
x1975
2143C
Max Tree
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1300
x14325
2140B
Another Divisibility Problem
constructive algorithms
,
math
,
number theory
900
x22462
2138F
Ode to the Bridge Builder
constructive algorithms
,
geometry
3500
x83
2138E2
Determinant Construction (Hard Version)
brute force
,
constructive algorithms
,
math
,
matrices
,
number theory
3100
x186
2138E1
Determinant Construction (Easy Version)
brute force
,
constructive algorithms
,
math
,
matrices
,
number theory
3100
x243
2138A
Cake Assignment
bitmasks
,
constructive algorithms
,
greedy
1100
x17189
2137D
Replace with Occurrences
constructive algorithms
1200
x19773
2137B
Fun Permutation
constructive algorithms
,
math
,
number theory
900
x26697
2137A
Collatz Conjecture
constructive algorithms
,
math
800
x35538
2136B
Like the Bitset
constructive algorithms
,
greedy
,
two pointers
900
x21159
2135D2
From the Unknown (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2500
x1008
2135D1
From the Unknown (Easy Version)
constructive algorithms
,
interactive
,
math
2100
x2632
2135B
For the Champion
constructive algorithms
,
interactive
,
math
1700
x7622
2134E
Power Boxes
constructive algorithms
,
dp
,
implementation
,
interactive
2300
x2429
2134D
Sliding Tree
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
,
trees
2300
x3683
2134B
Add 0 or K
constructive algorithms
,
math
,
number theory
1200
x21188
2134A
Painting With Two Colors
constructive algorithms
,
implementation
,
math
800
x26793
2133E
I Yearned For The Mines
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1719
2131H
Sea, You & copriMe
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
2600
x892
2131B
Alternating Series
constructive algorithms
,
greedy
,
math
800
x31136
2130B
Pathless
constructive algorithms
1100
x21642
2129C3
Interactive RBS (Hard Version)
binary search
,
bitmasks
,
constructive algorithms
,
dp
,
interactive
2300
x1707
2129C2
Interactive RBS (Medium Version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
2000
x2576
2129C1
Interactive RBS (Easy Version)
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1900
x3955
2129A
Double Perspective
constructive algorithms
,
dp
,
dsu
,
graphs
,
greedy
,
sortings
1300
x17089
2128E2
Submedians (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
math
,
two pointers
2600
x804
2128B
Deque Process
constructive algorithms
,
greedy
,
sortings
,
two pointers
1100
x21654
2127G2
Inter Active (Hard Version)
binary search
,
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
math
,
probabilities
3500
x113
2127G1
Inter Active (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
probabilities
3400
x106
2127E
Ancient Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2100
x3048
2127A
Mix Mex Max
constructive algorithms
,
greedy
,
math
800
x19998
2125A
Difficult Contest
constructive algorithms
,
implementation
,
sortings
,
strings
800
x28205
2124I
Lexicographic Partition
constructive algorithms
,
math
,
trees
3500
x220
2124E
Make it Zero
constructive algorithms
,
greedy
,
math
2100
x4025
2124C
Subset Multiplication
constructive algorithms
,
greedy
,
math
,
number theory
1300
x15003
2123F
Minimize Fixed Points
constructive algorithms
,
number theory
1700
x9853
2123D
Binary String Battle
constructive algorithms
,
games
,
greedy
1200
x22066
2122F
Colorful Polygon
constructive algorithms
,
divide and conquer
,
geometry
3400
x134
2122C
Manhattan Pairs
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
1700
x8685
2122A
Greedy Grid
constructive algorithms
,
greedy
800
x19551
2121B
Above the Clouds
constructive algorithms
,
greedy
,
strings
800
x32620
2120C
Divine Tree
constructive algorithms
,
greedy
,
math
,
sortings
,
trees
1400
x12719
2119C
A Good Problem
bitmasks
,
constructive algorithms
,
math
1300
x16438
2118E
Grid Coloring
constructive algorithms
,
geometry
,
greedy
,
math
2400
x1432
2118B
Make It Permutation
constructive algorithms
1200
x20154
2118A
Equal Subsequences
constructive algorithms
,
greedy
800
x29232
2117B
Shrink
constructive algorithms
800
x32322
2115B
Gellyfish and Camellia Japonica
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2100
x4171
2115A
Gellyfish and Flaming Peony
constructive algorithms
,
dp
,
math
,
number theory
1500
x15343
2114G
Build an Array
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
,
number theory
2200
x2048
2113F
Two Arrays
constructive algorithms
,
dfs and similar
,
graphs
,
math
2500
x959
2113D
Cheater
binary search
,
constructive algorithms
,
greedy
,
implementation
2200
x2909
2113C
Smilo and Minecraft
brute force
,
constructive algorithms
,
greedy
1700
x8060
2113B
Good Start
constructive algorithms
,
math
1200
x14753
2112D
Reachability and Tree
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9547
2111F
Puzzle
brute force
,
constructive algorithms
,
greedy
,
math
2400
x1433
2111D
Creating a Schedule
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1400
x12113
2110C
Racing
constructive algorithms
,
greedy
1400
x15956
2109C3
Hacking Numbers (Hard Version)
constructive algorithms
,
interactive
,
math
,
number theory
2600
x3240
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