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Custom test
Problems
#
Name
1972B
Coin Games
games
900
x14571
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x16293
1971H
±1
2-sat
,
dfs and similar
,
graphs
x747
1971G
XOUR
data structures
,
dsu
,
sortings
x4716
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
x5136
1971E
Find the Car
binary search
,
math
,
sortings
x7545
1971D
Binary Cut
greedy
,
implementation
,
sortings
,
strings
x16566
1971C
Clock and Strings
implementation
x21210
1971B
Different String
implementation
,
strings
x24520
1971A
My First Sorting Problem
implementation
,
sortings
x29687
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x158
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x292
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x598
1970F3
Playing Quidditch (Hard)
implementation
2300
x210
1970F2
Playing Quidditch (Medium)
implementation
2300
x218
1970F1
Playing Quidditch (Easy)
implementation
2300
x291
1970E3
Trails (Hard)
dp
,
matrices
2200
x342
1970E2
Trails (Medium)
dp
,
matrices
2000
x557
1970E1
Trails (Easy)
dp
1800
x784
1970D3
Arithmancy (Hard)
interactive
3100
x44
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x103
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x358
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x646
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x985
1970C1
Game on Tree (Easy)
games
1400
x1270
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x275
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x428
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x589
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x297
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x306
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x1819
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x103
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x892
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3171
1969C
Minimizing the Sum
dp
,
implementation
1700
x5834
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x13775
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x15385
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1303
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x2955
1968F
Equal XOR Segments
binary search
,
data structures
1800
x3645
1968E
Cells Arrangement
constructive algorithms
1600
x7333
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x10982
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x18414
1968B
Prefiquence
greedy
,
two pointers
800
x22141
1968A
Maximize?
brute force
,
math
,
number theory
800
x25938
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x27
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x51
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x116
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x408
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1218
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x2915
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x9394
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x8720
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11164
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x14147
1965F
Conference
data structures
,
flows
3300
x71
1965E
Connected Cubes
constructive algorithms
,
games
3100
x169
1965D
Missing Subarray Sum
constructive algorithms
2900
x255
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1386
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x4876
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x9886
1958J
Necromancer
*special problem
x4
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
x6
1958H
Composite Spells
*special problem
,
dp
x43
1958G
Observation Towers
*special problem
x74
1958F
Narrow Paths
*special problem
,
combinatorics
x125
1958E
Yet Another Permutation Constructive
*special problem
x171
1958D
Staircase
*special problem
x287
1958C
Firewood
*special problem
x391
1958B
Clock in the Pool
*special problem
,
math
x511
1958A
1-3-5
*special problem
x754
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x279
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x339
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x989
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3578
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7524
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14832
1957A
Stickogon
constructive algorithms
,
greedy
800
x19781
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x260
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x657
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1204
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3194
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10607
1956B
Nene and the Card Game
games
,
greedy
800
x18767
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x18903
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1012
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3445
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x5878
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7135
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x12797
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x17779
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x23769
1955A
Yogurt Sale
math
800
x36480
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x203
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1786
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4884
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x15685
1954B
Make It Ugly
implementation
,
math
1200
x15425
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x20398
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x692
←
1
2
3
...
95
96
→
→ Pay attention
Before contest
Codeforces Round 945 (Div. 2)
4 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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