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When submitting a solution in C++, please select either C++14 (GCC 6-32) or C++17 (GCC 7-32) as your compiler.
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Codeforces Round 936 (Div. 2)
2 days
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Difficulty:
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interactive
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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Custom test
Problems
#
Name
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x11
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x5862
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1021
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5452
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x89
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x114
1919H
Tree Diameter
interactive
,
trees
2000
x117
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1398
1906C
Cursed Game
interactive
3000
x121
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1684
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x214
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x320
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1160
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x2898
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3415
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10318
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x982
1856D
More Wrong
divide and conquer
,
interactive
2100
x3012
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x496
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x309
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2766
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x872
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2169
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1063
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x285
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x332
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x233
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2789
1812H
Expected Twist
*special problem
,
interactive
x118
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11490
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7087
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4558
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1676
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x631
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x744
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x442
1773H
Hot and Cold
binary search
,
interactive
2600
x323
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x355
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x370
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x429
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x479
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3221
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x95
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x356
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1326
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1133
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6620
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x351
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x493
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5379
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x561
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8453
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4214
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3436
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x752
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2051
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1355
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3629
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
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4186
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x297
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3050
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3134
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6668
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1682
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4478
1599H
Hidden Fortress
interactive
,
math
2100
x996
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2124
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3487
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5185
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x429
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x101
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x371
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x682
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6366
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x308
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x12771
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x453
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1926
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7393
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2610
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x141
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1823
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5691
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x246
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4246
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2858
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x10687
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x557
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