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Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round)
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combine-tags-by-or
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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
2020D
Connect the Dots
brute force
,
dp
,
dsu
,
graphs
,
math
,
trees
1800
x4274
2020C
Bitwise Balancing
bitmasks
,
implementation
,
math
1400
x9612
2018C
Tree Pruning
brute force
,
dfs and similar
,
greedy
,
sortings
,
trees
1700
x4884
2018B
Speedbreaker
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1900
x3030
2018A
Cards Partition
2-sat
,
brute force
,
greedy
,
implementation
,
math
1600
x8430
2014H
Robin Hood Archery
data structures
,
divide and conquer
,
greedy
,
hashing
1900
x2904
2014E
Rendez-vous de Marian et Robin
dfs and similar
,
graphs
,
shortest paths
1800
x4673
2014D
Robert Hood and Mrs Hood
brute force
,
data structures
,
greedy
,
sortings
1400
x10273
2013D
Minimize the Difference
binary search
,
greedy
1900
x5194
2013C
Password Cracking
constructive algorithms
,
interactive
,
strings
1400
x10428
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x2699
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x6238
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3448
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x5913
2009E
Klee's SUPER DUPER LARGE Array!!!
binary search
,
math
,
ternary search
1400
x11982
2009D
Satyam and Counting
geometry
,
math
1400
x13043
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x4675
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x11651
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x9041
2007C
Dora and C++
math
,
number theory
1500
x11287
2006B
Iris and the Tree
brute force
,
data structures
,
dfs and similar
,
dsu
,
math
,
trees
1800
x3001
2006A
Iris and Game on the Tree
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
1700
x6222
2005C
Lazy Narek
dp
,
implementation
,
strings
1800
x6452
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x10136
2003D1
Turtle and a MEX Problem (Easy Version)
greedy
,
math
1500
x10564
2002D1
DFS Checker (Easy Version)
brute force
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
trees
1900
x4174
2001D
Longest Max Min Subsequence
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
1900
x4779
2001C
Guess The Tree
binary search
,
brute force
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
interactive
,
trees
1500
x10260
2000F
Color Rows and Columns
dp
,
greedy
,
implementation
,
math
1900
x5102
2000E
Photoshoot for Gorillas
combinatorics
,
data structures
,
greedy
,
math
1400
x12642
1999G2
Ruler (hard version)
binary search
,
interactive
,
ternary search
1700
x7493
1999G1
Ruler (easy version)
binary search
,
interactive
1500
x9661
1999F
Expected Median
combinatorics
,
math
1500
x9801
1999E
Triple Operations
dp
,
implementation
,
math
1300
x17703
1998C
Perform Operations to Maximize Score
binary search
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x5875
1997D
Maximize the Root
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1500
x11972
1996F
Bomb
binary search
,
greedy
,
math
1900
x4495
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x9157
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x15289
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x8272
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8453
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5543
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x10310
1993C
Light Switches
implementation
,
math
1400
x13131
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5567
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x8858
1991E
Coloring Game
constructive algorithms
,
dfs and similar
,
games
,
graphs
,
greedy
,
interactive
1900
x4036
1991D
Prime XOR Coloring
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
1900
x6389
1991C
Absolute Zero
constructive algorithms
,
greedy
,
math
1300
x13923
1990D
Grid Puzzle
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
1800
x6063
1990C
Mad MAD Sum
brute force
,
greedy
,
math
1500
x11141
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5778
1989C
Two Movies
greedy
,
math
1400
x17947
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x16037
1987D
World is Mine
dp
,
games
1800
x6939
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x4423
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x8485
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x14857
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
1700
x5429
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x9046
1985F
Final Boss
binary search
,
data structures
1500
x14831
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x7186
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x16164
1983D
Swap Dilemma
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
math
,
sortings
1700
x7966
1983C
Have Your Cake and Eat It Too
binary search
,
brute force
,
greedy
,
implementation
1400
x12198
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6943
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x5178
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x13420
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x3644
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10189
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x13957
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x18196
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6448
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x10935
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x14594
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6597
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x10127
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x5845
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3499
1974E
Money Buys Happiness
dp
1800
x7774
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x14499
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x15461
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8175
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13734
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x8985
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9717
1971E
Find the Car
binary search
,
math
,
sortings
1500
x13905
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1293
1970E1
Trails (Easy)
dp
1800
x2060
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1475
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x2569
1970C1
Game on Tree (Easy)
games
1400
x3288
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x1087
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4452
1969C
Minimizing the Sum
dp
,
implementation
1700
x8512
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4166
1968F
Equal XOR Segments
binary search
,
data structures
1800
x5363
1968E
Cells Arrangement
constructive algorithms
1600
x10200
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14654
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x13046
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