โœ๏ธ ์ฝ”ํ…Œ ์ค€๋น„/Dynamic Programming

[๋™์  ๊ณ„ํš๋ฒ• 1] [Python] 1003๋ฒˆ. ํ”ผ๋ณด๋‚˜์น˜ ํ•จ์ˆ˜

2021. 1. 12. 11:00
๋ชฉ์ฐจ
  1. ์ž…๋ ฅ
  2. ์ถœ๋ ฅ
  3. ํ•ด๊ฒฐ ๋ฐฉ๋ฒ•
  4. ํ•ด๊ฒฐ ๊ณผ์ •

www.acmicpc.net/problem/1003

 

1003๋ฒˆ: ํ”ผ๋ณด๋‚˜์น˜ ํ•จ์ˆ˜

๊ฐ ํ…Œ์ŠคํŠธ ์ผ€์ด์Šค๋งˆ๋‹ค 0์ด ์ถœ๋ ฅ๋˜๋Š” ํšŸ์ˆ˜์™€ 1์ด ์ถœ๋ ฅ๋˜๋Š” ํšŸ์ˆ˜๋ฅผ ๊ณต๋ฐฑ์œผ๋กœ ๊ตฌ๋ถ„ํ•ด์„œ ์ถœ๋ ฅํ•œ๋‹ค.

www.acmicpc.net

 

 

์ž…๋ ฅ

์ฒซ์งธ ์ค„์— ํ…Œ์ŠคํŠธ ์ผ€์ด์Šค์˜ ๊ฐœ์ˆ˜ T๊ฐ€ ์ฃผ์–ด์ง„๋‹ค.

๊ฐ ํ…Œ์ŠคํŠธ ์ผ€์ด์Šค๋Š” ํ•œ ์ค„๋กœ ์ด๋ฃจ์–ด์ ธ ์žˆ๊ณ , N์ด ์ฃผ์–ด์ง„๋‹ค. N์€ 40๋ณด๋‹ค ์ž‘๊ฑฐ๋‚˜ ๊ฐ™์€ ์ž์—ฐ์ˆ˜ ๋˜๋Š” 0์ด๋‹ค.

์ถœ๋ ฅ

๊ฐ ํ…Œ์ŠคํŠธ ์ผ€์ด์Šค๋งˆ๋‹ค 0์ด ์ถœ๋ ฅ๋˜๋Š” ํšŸ์ˆ˜์™€ 1์ด ์ถœ๋ ฅ๋˜๋Š” ํšŸ์ˆ˜๋ฅผ ๊ณต๋ฐฑ์œผ๋กœ ๊ตฌ๋ถ„ํ•ด์„œ ์ถœ๋ ฅํ•œ๋‹ค.


ํ•ด๊ฒฐ ๋ฐฉ๋ฒ•

ํ”ผ๋ณด๋‚˜์น˜ ์žฌ๊ท€ ํ•จ์ˆ˜์— ๊ด€ํ•œ ๋ฌธ์ œ๋‹ค.

0๊ณผ 1์ด ํ˜ธ์ถœ๋˜๋Š” ํšŸ์ˆ˜ ์ž์ฒด๋„ ๊ทœ์น™์ด ์žˆ์Œ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค.

  0 1 2 3 4 5 6 7
0 1 0 1 1 2 3 5 8
1 0 1 1 2 3 5 8 13

์œ„์™€ ๊ฐ™์ด ํ˜ธ์ถœ๋˜๋Š” ํšŸ์ˆ˜๋„ (n-2) + (n-1) (nโ‰ฅ2์ผ ๋•Œ) ๊ทœ์น™์ด ์žˆ์Œ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค.

 

์žฌ๊ท€๋ฅผ ์ด์šฉํ•˜์ง€ ์•Š๊ณ  dp๋ฅผ ํ†ตํ•ด ์ ‘๊ทผํ–ˆ๋‹ค.

 

 

ํ•ด๊ฒฐ ๊ณผ์ •

n = 0, 1์— ๋Œ€ํ•œ 0๊ณผ 1์˜ ํ˜ธ์ถœ ํšŸ์ˆ˜๋Š” ๋ฏธ๋ฆฌ ์„ ์–ธํ•ด๋‘๊ณ  nโ‰ฅ2์— ๋Œ€ํ•ด์„œ๋Š” dp๋ฅผ ํ†ตํ•ด ํ•ด๊ฒฐํ–ˆ๋‹ค.

 

์ตœ์ข… ์ฝ”๋“œ๋Š” 

 

def fibonacci(n):
    countZero = [1, 0]
    countOne = [0, 1]
    
    if n == 0:
        print(countZero[0], countOne[0])
    elif n == 1:
        print(countZero[1], countOne[1])
    else:
        for i in range(2, n+1):
            countZero.append(countZero[i-1] + countZero[i-2])
            countOne.append(countOne[i-1] + countOne[i-2])
        print(countZero[n], countOne[n])
    
def main():
    n = int(input())
    
    for _ in range(n):
        m = int(input())
        fibonacci(m)
    
if __name__ == "__main__":
    main()

 

 

์ €์ž‘์žํ‘œ์‹œ (์ƒˆ์ฐฝ์—ด๋ฆผ)

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