Call to Code 2014 Round1 Solutions

7/26/2019 Call to Code 2014 Round1 Solutions

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X X


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N N


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N

483

10 = 48.3


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N

N


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N

N N

N

S

S N N

S N N


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N

N 1 N 1000


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X (X 1) (X+ 1) X+ (X1) + (X+ 1) = 3 X N 3 X=N

N

N X N/3

N

N N

N X N

X (X+ 1) X (X 1)


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T T+ D T+ 2 D

M


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T , D , M (1 T , D 100, 1 M 1000)

D M


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A1, A2, . . . AN N A1 AN

Ri i

Ri=

3 A1, i

3 A2+ 2 A1, i

3 Ai+ 2 Ai1+ Ai2, i > 2

N

N 1 N 100 N A1, A2, . . . AN 1 Ai 100


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N R1, R2, . . . RN N


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n n 1 n i (2 i 1) 1


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1 1 n(n >1)

n 1 n n n

n(1 n 100)

n


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n k n k

k k i 2i 1

i (n i)


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105


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