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Before contest
Codeforces Round 942 (Div. 1)
03:44:07
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Before contest
Codeforces Round 942 (Div. 2)
03:44:07
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constructive algorithms
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
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
#
Name
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1260
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1270
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1279
1474E
What Is It?
constructive algorithms
,
greedy
2500
x1291
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1291
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1304
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1344
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1355
1528D
It's a bird! No, it's a plane! No, it's AaParsa!
constructive algorithms
,
graphs
,
shortest paths
2500
x1381
1361C
Johnny and Megan's Necklace
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1382
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1389
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1600
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1690
1325F
Ehab's Last Theorem
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2500
x1697
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1738
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1803
1368E
Ski Accidents
constructive algorithms
,
graphs
,
greedy
2500
x1936
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2163
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2194
468C
Hack it!
binary search
,
constructive algorithms
,
math
2500
x2237
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2523
1375E
Inversion SwapSort
constructive algorithms
,
greedy
,
sortings
2500
x2764
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x314
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x341
26E
Multithreading
constructive algorithms
2400
x362
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x458
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x475
1090C
New Year Presents
constructive algorithms
,
data structures
2400
x478
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x495
883J
Renovation
constructive algorithms
,
greedy
,
sortings
2400
x556
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x567
1089M
Minegraphed
constructive algorithms
,
graphs
2400
x585
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x616
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x623
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x644
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x690
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x731
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x767
417E
Square Table
constructive algorithms
,
math
,
probabilities
2400
x767
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x802
755E
PolandBall and White-Red graph
constructive algorithms
,
graphs
,
shortest paths
2400
x809
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x861
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x865
329C
Graph Reconstruction
constructive algorithms
2400
x877
297C
Splitting the Uniqueness
constructive algorithms
2400
x927
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x934
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x951
621D
Rat Kwesh and Cheese
brute force
,
constructive algorithms
,
math
2400
x961
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x987
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x992
1526E
Oolimry and Suffix Array
combinatorics
,
constructive algorithms
,
math
2400
x1016
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1021
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1045
1028E
Restore Array
constructive algorithms
2400
x1121
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1123
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1135
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1147
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1150
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1179
1343F
Restore the Permutation by Sorted Segments
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1230
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1240
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1254
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1256
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1259
1244G
Running in Pairs
constructive algorithms
,
greedy
,
math
2400
x1262
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1268
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1321
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1389
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1399
1333E
Road to 1600
brute force
,
constructive algorithms
2400
x1409
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1426
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1435
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1442
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1461
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1502
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1507
1667C
Half Queen Cover
constructive algorithms
,
math
2400
x1513
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1558
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1564
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1597
1749E
Cactus Wall
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1598
1373F
Network Coverage
binary search
,
constructive algorithms
,
data structures
,
greedy
2400
x1618
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1634
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1650
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1652
1753D
The Beach
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2400
x1660
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1682
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1684
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1704
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1785
798D
Mike and distribution
constructive algorithms
,
sortings
2400
x1836
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1940
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2077
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x4725
306D
Polygon
constructive algorithms
,
geometry
2300
x260
213D
Stars
constructive algorithms
,
geometry
2300
x333
42D
Strange town
constructive algorithms
,
math
2300
x385
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x540
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x557
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