Skip to content

Instantly share code, notes, and snippets.

@junichiro
Created February 19, 2018 08:43
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save junichiro/f2fe9c1f80f118e8762dbf2daa276ce9 to your computer and use it in GitHub Desktop.
Save junichiro/f2fe9c1f80f118e8762dbf2daa276ce9 to your computer and use it in GitHub Desktop.
会社で少し盛り上がった Project Euler をやってみる 018 ref: https://qiita.com/junichiro/items/176ccccf09d66c59ba17
以下の三角形の頂点から下まで移動するとき, その数値の和の最大値は23になる.
3
7 4
2 4 6
8 5 9 3
この例では 3 + 7 + 4 + 9 = 23.
以下の三角形を頂点から下まで移動するとき, その最大の和を求めよ.
75
95 64
17 47 82
18 35 87 10
20 04 82 47 65
19 01 23 75 03 34
88 02 77 73 07 63 67
99 65 04 28 06 16 70 92
41 41 26 56 83 40 80 70 33
41 48 72 33 47 32 37 16 94 29
53 71 44 65 25 43 91 52 97 51 14
70 11 33 28 77 73 17 78 39 68 17 57
91 71 52 38 17 14 91 43 58 50 27 29 48
63 66 04 68 89 53 67 30 73 16 69 87 40 31
04 62 98 27 23 09 70 98 73 93 38 53 60 04 23
class Problem18:
DATA = [
[75],
[95,64],
[17,47,82],
[18,35,87,10],
[20 ,4,82,47,65],
[19 ,1,23,75 ,3,34],
[88 ,2,77,73 ,7,63,67],
[99,65 ,4,28 ,6,16,70,92],
[41,41,26,56,83,40,80,70,33],
[41,48,72,33,47,32,37,16,94,29],
[53,71,44,65,25,43,91,52,97,51,14],
[70,11,33,28,77,73,17,78,39,68,17,57],
[91,71,52,38,17,14,91,43,58,50,27,29,48],
[63,66 ,4,68,89,53,67,30,73,16,69,87,40,31],
[ 4,62,98,27,23 ,9,70,98,73,93,38,53,60 ,4,23],
]
def main(self):
while(len(self.DATA) > 1):
self.reduceOne()
return self.DATA
def reduceOne(self):
lastLine = self.triangleMaxSumList(self.DATA.pop(), self.DATA.pop())
self.DATA.append(lastLine)
def triangleMaxSumList(self, l1, l2):
return [max(l2[i] + l1[i], l2[i] + l1[i+1]) for i in range(len(l2))]
if __name__ == '__main__':
p = Problem18()
print(p.main()[0][0])
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment