AtCoder Regular Contest 037

AtCoder

3/19/15

http://www.slideshare.net/chokudai/abc004

3/19/15

AtCoder Inc. All rights reserved.

A

1.2.

3/19/15

A

N i mi

11 1

80

() 25, 1 mi 1003/19/15

A

mi 80 80 - mi mi 80 0

max(0, 80 mi)

3/19/15

AtCoder Inc. All rights reserved.

B

1.2.

3/19/15

B

NM

N 100, M N(N-1)/2

3/19/15

B

DFS

3/19/15

B

DFS

DFS 3/19/15

AtCoder Inc. All rights reserved.

C

1.2.

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C

N^2

N^2 K

N 30000 () 10^9

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C ()

5: N 10

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C ()

100: N 30000

9

K

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C ()

KX

X-1K XK

1,1,2,2,2,2,2,4,4 72 1 < 7 2 73/19/15

C ()

X-1K XK

XKX K

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C ()

XX K

K

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C ()

a_i * b_j K b_j K / a_i ()

iK b_1, b_2, , b_N K / a_i

b O(log(N)) 3/19/15

C ()

O(log(MAX_A * MAX_B) * N * log(N))

log(10^18) * 3 * log(3) = 2700

C++

3/19/15

AtCoder Inc. All rights reserved.

1.2.

3/19/15

DChaotic Polygons

D

mod 107

L 10^5 ( 3^L )

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D

L f(L)

3 * f(L-1)

AB g(L-1) g(L-1)^3

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A B

D

g(L) (AB L+1)

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A B

D

ACDB

CD g(L-1) AC DB g(L-1) E

L+2AEC h(L)E

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A B

C D

E

D

L+2AEC h(L)

FGHE

AFEGC H

h(L) g(L-1), h(L-1)

f(L),g(L),h(L) f(L-1), g(L-1), h(L-1) O(L) f(L) 3/19/15

A

C

E

H

F

G

D

3/19/15

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