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April 23, 2024 11:58
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令和6年度春期応用技術者試験_午後_問3
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import heapq | |
def distance(): | |
N = 5 # ノードの個数 | |
INF = float("inf") # 十分大きい定数 | |
# edge[m, n]には、ノードmからノードnへの距離を格納 | |
# 二つのノードが隣接していない場合には INF を格納 | |
edge = [ | |
[INF, 10, 16, INF, INF], | |
[10, INF, 4, 3, INF], | |
[16, 4, INF, 2, 3], | |
[INF, 3, 2, INF, 6], | |
[INF, INF, 3, 6, INF], | |
] | |
GOAL = N - 1 # 終点のノード番号 | |
dist = [INF] * N # 始点ノード距離。初期値はINF。 | |
viaNode = [-1] * N # 最短経路のノード番号を格納する | |
dist[0] = 0 | |
que = [] | |
heapq.heappush(que, (dist[0], 0)) | |
while que: | |
curNode = heapq.heappop(que)[1] | |
if curNode == GOAL: | |
j = GOAL # 終点のノード番号 | |
print(GOAL) # 終点のノード番号の出力 | |
while j > 0: # 最短経路の出力 | |
print(viaNode[j]) | |
j = viaNode[j] | |
return dist[curNode] | |
for k in range(N): | |
if dist[curNode] + edge[curNode][k] < dist[k]: | |
dist[k] = dist[curNode] + edge[curNode][k] | |
heapq.heappush(que, (dist[k], k)) | |
viaNode[k] = curNode | |
print(distance()) |
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