結果
問題 |
No.2026 Yet Another Knapsack Problem
|
ユーザー |
![]() |
提出日時 | 2025-04-15 22:26:33 |
言語 | PyPy3 (7.3.15) |
結果 |
TLE
|
実行時間 | - |
コード長 | 2,378 bytes |
コンパイル時間 | 346 ms |
コンパイル使用メモリ | 82,132 KB |
実行使用メモリ | 89,728 KB |
最終ジャッジ日時 | 2025-04-15 22:29:13 |
合計ジャッジ時間 | 60,480 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 35 TLE * 1 -- * 6 |
ソースコード
import sys def main(): input = sys.stdin.read().split() ptr = 0 N = int(input[ptr]) ptr += 1 v1 = int(input[ptr + 1]) ptr += 2 # skip c1 which is N non_type1 = [] for i in range(2, N + 1): ci = int(input[ptr]) vi = int(input[ptr + 1]) ptr += 2 non_type1.append((ci, vi, i)) # Initialize value_non[m][w] value_non = [[-float('inf')] * (N + 1) for _ in range(N + 1)] value_non[0][0] = 0 for ci, vi, i in non_type1: # Binary decomposition of ci cnt = ci parts = [] current = 1 while cnt > 0: part = min(current, cnt) parts.append(part) cnt -= part current <<= 1 for part in parts: part_val = part * vi part_weight = part * i part_count = part # Update DP in reverse for m in range(N, part_count - 1, -1): for w in range(N, part_weight - 1, -1): if value_non[m - part_count][w - part_weight] != -float('inf'): if value_non[m - part_count][w - part_weight] + part_val > value_non[m][w]: value_non[m][w] = value_non[m - part_count][w - part_weight] + part_val # Post-process to invalidate w < 2m for m in range(N + 1): for w in range(N + 1): if w < 2 * m: value_non[m][w] = -float('inf') # Precompute prefix_max[m][w] prefix_max = [[-float('inf')] * (N + 1) for _ in range(N + 1)] for m in range(N + 1): current_max = -float('inf') for w in range(N + 1): current_max = max(current_max, value_non[m][w]) prefix_max[m][w] = current_max # Compute answers for each k_total for k_total in range(1, N + 1): m_max = min(k_total, N - k_total) max_val = -float('inf') for m in range(0, m_max + 1): W_max = N - k_total + m if W_max < 0: continue if W_max > N: W_max = N current_max = prefix_max[m][W_max] if current_max == -float('inf'): continue total = current_max + (k_total - m) * v1 if total > max_val: max_val = total print(max_val) if __name__ == '__main__': main()