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Problems
#
Name
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4918
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10563
1651B
Prove Him Wrong
constructive algorithms
,
greedy
800
x19424
1651A
Playoff
implementation
800
x25467
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2360
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1399
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4054
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x12810
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16532
1650B
DIV + MOD
math
900
x27171
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x34152
1649B
Game of Ball Passing
greedy
,
implementation
1300
x12841
1649A
Game
implementation
800
x15433
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x107
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x387
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x814
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2891
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6269
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x12090
1647F
Madoka and Laziness
dp
,
greedy
3100
x379
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x963
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5176
1647C
Madoka and Childish Pranks
constructive algorithms
,
greedy
1300
x12451
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15171
1647A
Madoka and Math Dad
implementation
,
math
800
x22572
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x407
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2324
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3606
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13529
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20964
1646A
Square Counting
math
800
x24079
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x316
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3027
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x7046
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x13498
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20545
1644A
Doors and Keys
implementation
800
x27060
1642B
Power Walking
greedy
900
x16708
1642A
Hard Way
geometry
800
x16051
1641F
Covering Circle
geometry
3500
x96
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x205
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1067
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2351
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3752
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x17656
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
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x212
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1812
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4087
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14454
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20529
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x21270
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x304
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x496
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1719
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3216
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7462
1637C
Andrew and Stones
greedy
,
implementation
1200
x17471
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x14693
1637A
Sorting Parts
brute force
,
sortings
800
x22154
1635F
Closest Pair
data structures
,
greedy
2800
x990
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2184
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6087
1635C
Differential Sorting
constructive algorithms
,
greedy
1200
x16762
1635B
Avoid Local Maximums
greedy
800
x17852
1635A
Min Or Sum
bitmasks
,
greedy
800
x22451
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1538
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1612
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4258
1634C
OKEA
constructive algorithms
1000
x18013
1634B
Fortune Telling
bitmasks
,
math
1400
x15978
1634A
Reverse and Concatenate
greedy
,
strings
800
x23726
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x312
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1470
1633D
Make Them Equal
dp
,
greedy
1600
x13355
1633C
Kill the Monster
brute force
,
math
1100
x19758
1633B
Minority
greedy
800
x27449
1633A
Div. 7
brute force
800
x32183
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x937
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1120
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4516
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12404
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x21373
1632A
ABC
implementation
800
x29072
1631B
Fun with Even Subarrays
dp
,
greedy
1100
x19634
1631A
Min Max Swap
greedy
800
x28777
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x532
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x431
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1534
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2875
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Educational Codeforces Round 167 (Rated for Div. 2)
29:58:29
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2-sat
binary search
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dfs and similar
divide and conquer
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fft
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games
geometry
graph matchings
graphs
greedy
hashing
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number theory
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