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Problems
#
Name
1973F
Maximum GCD Sum Queries
brute force
,
dp
,
implementation
,
number theory
x57
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
x16600
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x19003
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x183
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x327
1970E3
Trails (Hard)
dp
,
matrices
2200
x380
1970E2
Trails (Medium)
dp
,
matrices
2000
x653
1970E1
Trails (Easy)
dp
1800
x954
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x760
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1209
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x113
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x943
1969C
Minimizing the Sum
dp
,
implementation
1700
x6170
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1379
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3140
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x55
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x120
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1285
1958H
Composite Spells
*special problem
,
dp
2600
x60
1958A
1-3-5
*special problem
,
dp
1100
x966
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1016
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3679
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7747
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3259
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1034
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3530
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5966
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x208
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4958
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x201
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3547
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x20531
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1249
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x84
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14576
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20595
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x785
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2122
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9223
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x18087
1945D
Seraphim the Owl
dp
,
greedy
1300
x12288
1943F
Minimum Hamming Distance
dp
3500
x79
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x600
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1261
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x62
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x373
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2447
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8241
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16710
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29885
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26596
1939D
Big Persimmon
*special problem
,
dp
,
games
x59
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x14
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13200
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7190
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16786
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2213
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3426
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x26912
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x253
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x992
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2378
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3708
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1518
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4197
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1559
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1500
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18429
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2980
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1505
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10155
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x23400
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3248
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x129
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x778
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12424
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3217
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16270
1922F
Replace on Segment
dp
,
graph matchings
2500
x1170
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1132
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3470
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2379
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x742
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x778
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16905
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4296
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x901
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1666
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19527
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x502
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x584
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1228
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1678
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3694
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x18342
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2728
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2061
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x42
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x175
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