Buggy python submission (verdict: Time Limit Exceeded):
# coding: utf-8

from itertools import permutations
import sys

N, M, R = map(int, sys.stdin.readline().split())
r = [i - 1 for i in map(int, sys.stdin.readline().split())]

G = [[float('inf')] * N for _ in xrange(N)]

for i in xrange(N):
    G[i][i] = 0

for i in range(M):
    A, B, C = map(int, sys.stdin.readline().split())
    G[A-1][B-1] =  G[B-1][A-1] = C

# Warshall–Floyd Algorithm
for k in xrange(N):
    for i in xrange(N):
        for j in xrange(N):
            G[i][j] = min(G[i][j], G[i][k] + G[k][j]); 

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([G[i[j]][i[j+1]] for j in xrange(R-1)]))

print ans


Fixed submission:
# coding: utf-8

from itertools import permutations
import Queue

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[] for _ in xrange(N)]

for i in range(M):
    A, B, C = map(int, raw_input().split())
    A -= 1; B -= 1;
    G[A].append((B, C))
    G[B].append((A, C))

# dijkstra Algorithm
def dijkstra(s):
    d = [float("inf") for _ in xrange(N)]
    que = Queue.PriorityQueue()
    d[s] = 0
    que.put([0, s])

    while not que.empty():
        p = que.get()
        v = p[1]
        if d[v] < p[0]:
            continue
        for i, j in G[v]:
            if d[i] > d[v] + j:
                d[i] = d[v] + j
                que.put([d[i], i])
    return d

table = {}

for i in r:
    table[i] = dijkstra(i)

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([table[i[j]][i[j+1]] for j in xrange(R-1)]))

print ans

Buggy python submission (verdict: Time Limit Exceeded):
# coding: utf-8

from itertools import permutations
import sys

N, M, R = map(int, sys.stdin.readline().split())
r = [i - 1 for i in map(int, sys.stdin.readline().split())]

G = [[float('inf')] * N for _ in range(N)]

for i in range(N):
    G[i][i] = 0

for i in range(M):
    A, B, C = map(int, sys.stdin.readline().split())
    G[A-1][B-1] =  G[B-1][A-1] = C

# Warshall–Floyd Algorithm
for k in range(N):
    for i in range(N):
        for j in range(N):
            G[i][j] = min(G[i][j], G[i][k] + G[k][j]); 

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([G[i[j]][i[j+1]] for j in range(R-1)]))

print ans


Fixed submission:
# coding: utf-8

from itertools import permutations
import Queue

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[] for _ in xrange(N)]

for i in range(M):
    A, B, C = map(int, raw_input().split())
    A -= 1; B -= 1;
    G[A].append((B, C))
    G[B].append((A, C))

# dijkstra Algorithm
def dijkstra(s):
    d = [float("inf") for _ in xrange(N)]
    que = Queue.PriorityQueue()
    d[s] = 0
    que.put([0, s])

    while not que.empty():
        p = que.get()
        v = p[1]
        if d[v] < p[0]:
            continue
        for i, j in G[v]:
            if d[i] > d[v] + j:
                d[i] = d[v] + j
                que.put([d[i], i])
    return d

table = {}

for i in r:
    table[i] = dijkstra(i)

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([table[i[j]][i[j+1]] for j in xrange(R-1)]))

print ans

Buggy python submission (verdict: Time Limit Exceeded):
# coding: utf-8

from itertools import permutations

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[float('inf')] * N for _ in range(N)]

for i in range(N):
    G[i][i] = 0

for i in range(M):
    A, B, C = map(int, raw_input().split())
    G[A-1][B-1] =  G[B-1][A-1] = C

# Warshall–Floyd Algorithm
for k in range(N):
    for i in range(N):
        for j in range(N):
            G[i][j] = min(G[i][j], G[i][k] + G[k][j]); 

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([G[i[j]][i[j+1]] for j in range(R-1)]))

print ans


Fixed submission:
# coding: utf-8

from itertools import permutations
import Queue

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[] for _ in xrange(N)]

for i in range(M):
    A, B, C = map(int, raw_input().split())
    A -= 1; B -= 1;
    G[A].append((B, C))
    G[B].append((A, C))

# dijkstra Algorithm
def dijkstra(s):
    d = [float("inf") for _ in xrange(N)]
    que = Queue.PriorityQueue()
    d[s] = 0
    que.put([0, s])

    while not que.empty():
        p = que.get()
        v = p[1]
        if d[v] < p[0]:
            continue
        for i, j in G[v]:
            if d[i] > d[v] + j:
                d[i] = d[v] + j
                que.put([d[i], i])
    return d

table = {}

for i in r:
    table[i] = dijkstra(i)

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([table[i[j]][i[j+1]] for j in xrange(R-1)]))

print ans

Buggy python submission (verdict: Time Limit Exceeded):
# coding: utf-8

from itertools import permutations

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[float('inf')] * N for _ in range(N)]

for i in range(N):
    G[i][i] = 0

for i in range(M):
    A, B, C = map(int, raw_input().split())
    G[A-1][B-1] =  G[B-1][A-1] = C

# Warshall–Floyd Algorithm
for k in range(N):
    for i in range(N):
        for j in range(N):
            G[i][j] = min(G[i][j], G[i][k] + G[k][j]); 

ans = float('inf')

for i in permutations(r):
    t = 0
    for j in range(R-1):
        t += G[i[j]][i[j+1]]

    ans = min(ans, t)

print ans


Fixed submission:
# coding: utf-8

from itertools import permutations
import Queue

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[] for _ in xrange(N)]

for i in range(M):
    A, B, C = map(int, raw_input().split())
    A -= 1; B -= 1;
    G[A].append((B, C))
    G[B].append((A, C))

# dijkstra Algorithm
def dijkstra(s):
    d = [float("inf") for _ in xrange(N)]
    que = Queue.PriorityQueue()
    d[s] = 0
    que.put([0, s])

    while not que.empty():
        p = que.get()
        v = p[1]
        if d[v] < p[0]:
            continue
        for i, j in G[v]:
            if d[i] > d[v] + j:
                d[i] = d[v] + j
                que.put([d[i], i])
    return d

table = {}

for i in r:
    table[i] = dijkstra(i)

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([table[i[j]][i[j+1]] for j in xrange(R-1)]))

print ans

Buggy python submission (verdict: Runtime Error):
from itertools import permutations

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[float('inf')] * N for _ in range(N)]

for i in range(N):
    G[i][i] = 0

for i in range(M):
    A, B, C = map(int, raw_input().split())
    G[A-1][B-1] =  G[B-1][A-1] = C

# Warshall–Floyd Algorithm
for k in range(N):
    for i in range(N):
        for j in range(N):
            G[i][j] = min(G[i][j], G[i][k] + G[k][j]); 

ans = float('inf')

for i in permutations(r):
    t = 0
    for j in range(R-1):
        t += G[i[j]][i[j+1]]

    ans = min(ans, t)

print ans


Fixed submission:
# coding: utf-8

from itertools import permutations
import Queue

N, M, R = map(int, raw_input().split())
r = [i - 1 for i in map(int, raw_input().split())]

G = [[] for _ in xrange(N)]

for i in range(M):
    A, B, C = map(int, raw_input().split())
    A -= 1; B -= 1;
    G[A].append((B, C))
    G[B].append((A, C))

# dijkstra Algorithm
def dijkstra(s):
    d = [float("inf") for _ in xrange(N)]
    que = Queue.PriorityQueue()
    d[s] = 0
    que.put([0, s])

    while not que.empty():
        p = que.get()
        v = p[1]
        if d[v] < p[0]:
            continue
        for i, j in G[v]:
            if d[i] > d[v] + j:
                d[i] = d[v] + j
                que.put([d[i], i])
    return d

table = {}

for i in r:
    table[i] = dijkstra(i)

ans = float('inf')

for i in permutations(r):
    ans = min(ans, sum([table[i[j]][i[j+1]] for j in xrange(R-1)]))

print ans