結果
| 問題 |
No.703 ゴミ拾い Easy
|
| コンテスト | |
| ユーザー |
gew1fw
|
| 提出日時 | 2025-06-12 15:29:39 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 284 ms / 1,500 ms |
| コード長 | 1,789 bytes |
| コンパイル時間 | 167 ms |
| コンパイル使用メモリ | 82,316 KB |
| 実行使用メモリ | 164,812 KB |
| 最終ジャッジ日時 | 2025-06-12 15:29:52 |
| 合計ジャッジ時間 | 9,896 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 46 |
ソースコード
import sys
from collections import deque
def main():
n = int(sys.stdin.readline())
a = list(map(int, sys.stdin.readline().split()))
x = list(map(int, sys.stdin.readline().split()))
y = list(map(int, sys.stdin.readline().split()))
s = [x[i] ** 2 + y[i] ** 2 for i in range(n)]
dp = [0] * n
deq = deque()
for i in range(n):
# Calculate m_j for j = i
if i == 0:
m_j = s[i]
else:
m_j = dp[i-1] + s[i]
current_slope = -2 * x[i]
current_intercept = m_j
# Add the new line to the deque, maintaining convex hull
while len(deq) >= 2:
# Last two lines in deque
l1_slope, l1_intercept = deq[-1]
l2_slope, l2_intercept = deq[-2]
# Check if the last line can be removed
left = (current_intercept - l2_intercept) * (l2_slope - l1_slope)
right = (l1_intercept - l2_intercept) * (l2_slope - current_slope)
if left <= right:
deq.pop()
else:
break
deq.append((current_slope, current_intercept))
# Query the best line for current a[i]
while len(deq) >= 2:
# Compare first two lines
l0_slope, l0_intercept = deq[0]
l1_slope, l1_intercept = deq[1]
val0 = l0_slope * a[i] + l0_intercept
val1 = l1_slope * a[i] + l1_intercept
if val0 >= val1:
deq.popleft()
else:
break
best_slope, best_intercept = deq[0]
min_val = best_slope * a[i] + best_intercept
dp[i] = a[i] ** 2 + min_val
print(dp[-1])
if __name__ == "__main__":
main()
gew1fw