結果
| 問題 |
No.2026 Yet Another Knapsack Problem
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-16 15:54:01 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 1,846 bytes |
| コンパイル時間 | 221 ms |
| コンパイル使用メモリ | 81,452 KB |
| 実行使用メモリ | 84,108 KB |
| 最終ジャッジ日時 | 2025-04-16 15:55:32 |
| 合計ジャッジ時間 | 33,348 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 WA * 1 |
| other | AC * 4 WA * 31 TLE * 1 -- * 6 |
ソースコード
import sys
import math
def main():
input = sys.stdin.read().split()
idx = 0
N = int(input[idx])
idx += 1
items = []
for i in range(1, N+1):
c_i = int(input[idx])
v_i = int(input[idx+1])
idx +=2
items.append( (i, c_i, v_i) )
# Separate item 1
item1 = items[0]
items = items[1:]
# Initialize DP
INF = -math.inf
dp = [ [INF]*(N+1) for _ in range(N+1) ]
dp[0][0] = 0
# Process items 2 to N
for (i, c_i, v_i) in items:
max_t = min(c_i, N // i)
if max_t ==0:
continue
for t in range(1, max_t+1):
for k in range(N, t-1, -1):
for w in range(N, t*i -1, -1):
if dp[k - t][w - t*i] != INF:
new_val = dp[k - t][w - t*i] + t * v_i
if new_val > dp[k][w]:
dp[k][w] = new_val
# Process item 1
i1, c1, v1 = item1
assert i1 == 1
# We need to make a copy of the current dp to avoid overwriting during iteration
# But in Python, nested list slicing is needed to avoid reference issues
new_dp = [row[:] for row in dp]
for k in range(N+1):
for w in range(N+1):
if dp[k][w] == INF:
continue
t_max = min(c1, N - k, N - w)
if t_max ==0:
continue
if v1 >=0:
new_k = k + t_max
new_w = w + t_max
new_val = dp[k][w] + t_max * v1
if new_k <= N and new_w <= N and new_val > new_dp[new_k][new_w]:
new_dp[new_k][new_w] = new_val
dp = new_dp
# Compute answers
for k in range(1, N+1):
max_val = max(dp[k][k:N+1])
print(max_val)
if __name__ == '__main__':
main()
lam6er