結果
| 問題 |
No.1393 Median of Walk
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-11-12 01:34:26 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
RE
(最新)
AC
(最初)
|
| 実行時間 | - |
| コード長 | 1,656 bytes |
| コンパイル時間 | 196 ms |
| コンパイル使用メモリ | 82,232 KB |
| 実行使用メモリ | 78,116 KB |
| 最終ジャッジ日時 | 2024-07-19 22:46:48 |
| 合計ジャッジ時間 | 4,723 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | RE * 3 |
| other | RE * 39 |
ソースコード
import sys
input = sys.stdin.readline
N,M = map(int,input().split())
edge = [tuple(map(int,input().split())) for i in range(M)]
assert 2<=N<=100
assert 1<=M<=N*(N-1)//2
assert len(edge)==M
check = set([])
for u,v,c in edge:
assert 1<=u<=N and 1<=v<=N
assert u!=v
assert 1<=c<=10**9
assert (u,v) not in check
check.add((u,v))
cost = [[10**18 for j in range(N)] for i in range(N)]
for i in range(N):
cost[i][i] = 0
for u,v,c in edge:
cost[u-1][v-1] = 1
for k in range(N):
for i in range(N):
for j in range(N):
if cost[i][j] > cost[i][k] + cost[k][j]:
cost[i][j] = cost[i][k] + cost[k][j]
edge.sort(key=lambda x:x[2])
ans = [[-1 for j in range(N)] for i in range(N)]
S = set([])
for u,v,c in edge:
for i in range(N):
for j in range(N):
if abs(cost[i][u-1])!=10**18 and abs(cost[v-1][j])!=10**18 and cost[i][j] > cost[i][u-1] + cost[v-1][j] - 1:
cost[i][j] = cost[i][u-1] + cost[v-1][j] - 1
if cost[i][j] <=0 and ans[i][j]==-1:
ans[i][j] = c
for k in range(N):
if cost[k][k] < 0 and k not in S:
S.add(k)
for i in range(N):
for j in range(N):
if cost[i][k]!=10**18 and cost[k][j]!=10**18:
cost[i][j] = -10**18
if ans[i][j]==-1:
ans[i][j] = c
Q = int(input())
assert 1<=Q<=N*(N-1)
res = [-1 for i in range(Q)]
for i in range(Q):
s,t = map(int,input().split())
assert 1<=s<=N and 1<=t<=N
assert s!=t
res[i] = ans[s-1][t-1]
print(*res,sep="\n")