結果

問題 No.453 製薬会社
ユーザー neterukunneterukun
提出日時 2022-01-05 15:23:05
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 45 ms / 2,000 ms
コード長 1,494 bytes
コンパイル時間 158 ms
コンパイル使用メモリ 82,176 KB
実行使用メモリ 52,608 KB
最終ジャッジ日時 2024-10-15 20:10:31
合計ジャッジ時間 1,505 ms
ジャッジサーバーID
(参考情報)
judge5 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 4
other AC * 9
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

def make_tableau(A, b, c):
m = len(A)
n = len(A[0])
tableau = []
for i in range(m):
row = A[i] + [int(j == i) for j in range(m)] + [b[i]]
tableau.append(row)
row = c + [0] * (m + 1)
tableau.append(row)
return tableau
def pivot_index(tableau):
cN = tableau[-1][:-1]
piv_col = -1
for col, x in enumerate(cN):
if x > 0:
piv_col = col
break
if piv_col == -1:
return False, -1, -1
a = [tableau[i][piv_col] for i in range(len(tableau) - 1)]
b = [tableau[i][-1] for i in range(len(tableau) - 1)]
thetas = [bi / ai if ai > 0 else float('inf') for ai, bi in zip(a, b)]
piv_row = thetas.index(min(thetas))
return True, piv_row, piv_col
def step(tableau, piv_row, piv_col):
h = len(tableau)
w = len(tableau[0])
piv = tableau[piv_row][piv_col]
for j in range(w):
tableau[piv_row][j] /= piv
for i in range(h):
if i == piv_row:
continue
d = tableau[i][piv_col]
for j in range(w):
tableau[i][j] -= d * tableau[piv_row][j]
def simplex(A, b, c):
tableau = make_tableau(A, b, c)
while True:
improved, piv_row, piv_col = pivot_index(tableau)
if not improved:
break
step(tableau, piv_row, piv_col)
return -tableau[-1][-1]
C, D = map(int, input().split())
A = [
[3 / 4, 2 / 7],
[1 / 4, 5 / 7]
]
b = [C, D]
c = [1000, 2000]
print(simplex(A, b, c))
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