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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
trees
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
1989B
Substring and Subsequence
brute force
,
dp
,
graphs
,
greedy
,
hashing
,
strings
,
trees
1200
x13249
1987G1
Spinning Round (Easy Version)
dp
,
trees
x59
1987E
Wonderful Tree!
brute force
,
dfs and similar
,
dp
,
flows
,
greedy
,
trees
x1370
1986F
Non-academic Problem
dfs and similar
,
graphs
,
trees
1900
x2857
1984E
Shuffle
dp
,
greedy
,
trees
2400
x1096
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x188
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x922
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x412
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x792
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1885
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4961
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x253
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x446
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x1030
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1092
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1879
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x379
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x378
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1465
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x337
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x396
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x229
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8264
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x346
1949F
Dating
greedy
,
sortings
,
trees
2200
x831
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1408
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x655
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9734
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1905
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x73
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x33
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x214
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x412
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x143
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x316
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1682
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1564
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4343
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4002
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3217
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3383
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x426
1919H
Tree Diameter
interactive
,
trees
2000
x135
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x173
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3673
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x809
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x919
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x140
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2133
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1729
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3805
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2827
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x167
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x885
1905B
Begginer's Zelda
greedy
,
trees
1100
x15658
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x319
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x861
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x578
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x929
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x4007
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1421
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x10811
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2992
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6981
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5720
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3479
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x70
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x103
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x540
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x838
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5130
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6290
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1207
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1127
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x119
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x260
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6854
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x80
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x257
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1106
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x416
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2502
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x72
1863H
Goldberg Machine 3
dp
,
trees
3500
x73
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9696
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x381
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1021
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1267
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4202
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x18311
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1335
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x5029
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x530
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3067
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5504
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x678
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x673
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1511
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x5088
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17368
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