Buggy python submission (verdict: Time Limit Exceeded):
from collections import defaultdict, Counter
from itertools import product, groupby, count, permutations, combinations
from math import pi, sqrt, factorial
from collections import deque
from bisect import bisect, bisect_left, bisect_right
from string import ascii_lowercase
from functools import lru_cache
import sys
sys.setrecursionlimit(10000)
INF = float("inf")
YES, Yes, yes, NO, No, no = "YES", "Yes", "yes", "NO", "No", "no"
dy4, dx4 = [0, 1, 0, -1], [1, 0, -1, 0]
dy8, dx8 = [0, -1, 0, 1, 1, -1, -1, 1], [1, 0, -1, 0, 1, 1, -1, -1]

def inside(y, x, H, W):
    return 0 <= y < H and 0 <= x < W


def ceil(a, b):
    return (a + b - 1) // b


def main():
    N, M, R = map(int, input().split())
    R = list(map(lambda x: int(x) - 1, input().split()))

    matrix = [[INF] * N for _ in range(N)]
    for _ in range(M):
        a, b, c = map(int, input().split())
        matrix[a - 1][b - 1] = c
        matrix[b - 1][a - 1] = c

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

    for m in range(N):
        for s in range(N):
            for e in range(N):
                if matrix[s][m] != INF and matrix[m][e] != INF:
                    matrix[s][e] = min(matrix[s][e], matrix[s][m] + matrix[m][e])

    ans = INF
    for r in permutations(R):
        tmp = 0
        for i in range(len(r) - 1):
            tmp += matrix[r[i]][r[i + 1]]
        ans = min(ans, tmp)

    print(ans)


if __name__ == '__main__':
    main()


Fixed submission:
from collections import defaultdict
from itertools import product, groupby, permutations
from math import pi
from collections import deque
from bisect import bisect, bisect_left, bisect_right
INF = 10 ** 10


def main():
    N, M, R = map(int, input().split())
    r_list = list(map(int, input().split()))
    dp = [[float("inf")] * (N + 1) for _ in range(N + 1)]
    for _ in range(M):
        A, B, C = map(int, input().split())
        dp[A][B] = dp[B][A] = C

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

    for m in range(N + 1):
        for s in range(N + 1):
            for e in range(N + 1):
                dist = dp[s][m] + dp[m][e]
                if dist < dp[s][e]:
                    dp[s][e] = dist

    ans = float("inf")
    for p in permutations(r_list, len(r_list)):
        total = 0
        for i in range(len(p) - 1):
            total += dp[p[i]][p[i + 1]]
            if total >= ans:
                break
        else:
            if total < ans:
                ans = total
    print(ans)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
from collections import defaultdict
from itertools import product, groupby, permutations
from math import pi
from collections import deque
from bisect import bisect, bisect_left, bisect_right
INF = 10 ** 10


def main():
    N, M, R = map(int, input().split())
    r_list = list(map(int, input().split()))
    dp = [[INF] * (N + 1) for _ in range(N + 1)]
    for _ in range(M):
        A, B, C = map(int, input().split())
        dp[A][B] = C
        dp[B][A] = C

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

    for m in range(N + 1):
        for s in range(N + 1):
            for e in range(N + 1):
                if dp[s][m] != INF and dp[m][e] != INF:
                    dist = dp[s][m] + dp[m][e]
                    if dist < dp[s][e]:
                        dp[s][e] = dist

    ans = INF
    for p in permutations(r_list, len(r_list)):
        total = 0
        for i in range(len(p) - 1):
            total += dp[p[i]][p[i + 1]]
            if total >= ans:
                break
        else:
            if total < ans:
                ans = total
    print(ans)

if __name__ == '__main__':
    main()


Fixed submission:
from collections import defaultdict
from itertools import product, groupby, permutations
from math import pi
from collections import deque
from bisect import bisect, bisect_left, bisect_right
INF = 10 ** 10


def main():
    N, M, R = map(int, input().split())
    r_list = list(map(int, input().split()))
    dp = [[float("inf")] * (N + 1) for _ in range(N + 1)]
    for _ in range(M):
        A, B, C = map(int, input().split())
        dp[A][B] = dp[B][A] = C

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

    for m in range(N + 1):
        for s in range(N + 1):
            for e in range(N + 1):
                dist = dp[s][m] + dp[m][e]
                if dist < dp[s][e]:
                    dp[s][e] = dist

    ans = float("inf")
    for p in permutations(r_list, len(r_list)):
        total = 0
        for i in range(len(p) - 1):
            total += dp[p[i]][p[i + 1]]
            if total >= ans:
                break
        else:
            if total < ans:
                ans = total
    print(ans)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
from collections import defaultdict
from itertools import product, groupby, permutations
from math import pi
from collections import deque
from bisect import bisect, bisect_left, bisect_right
INF = 10 ** 10


def main():
    N, M, R = map(int, input().split())
    r_list = list(map(int, input().split()))
    dp = [[INF] * (N + 1) for _ in range(N + 1)]
    for _ in range(M):
        A, B, C = map(int, input().split())
        dp[A][B] = C
        dp[B][A] = C

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

    for m in range(N + 1):
        for s in range(N + 1):
            for e in range(N + 1):
                if dp[s][m] != INF and dp[m][e] != INF:
                    dp[s][e] = min(dp[s][e], dp[s][m] + dp[m][e])

    ans = INF
    for p in permutations(r_list, len(r_list)):
        total = 0
        for i in range(len(p) - 1):
            total += dp[p[i]][p[i + 1]]
        ans = min(ans, total)
    print(ans)

if __name__ == '__main__':
    main()


Fixed submission:
from collections import defaultdict
from itertools import product, groupby, permutations
from math import pi
from collections import deque
from bisect import bisect, bisect_left, bisect_right
INF = 10 ** 10


def main():
    N, M, R = map(int, input().split())
    r_list = list(map(int, input().split()))
    dp = [[float("inf")] * (N + 1) for _ in range(N + 1)]
    for _ in range(M):
        A, B, C = map(int, input().split())
        dp[A][B] = dp[B][A] = C

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

    for m in range(N + 1):
        for s in range(N + 1):
            for e in range(N + 1):
                dist = dp[s][m] + dp[m][e]
                if dist < dp[s][e]:
                    dp[s][e] = dist

    ans = float("inf")
    for p in permutations(r_list, len(r_list)):
        total = 0
        for i in range(len(p) - 1):
            total += dp[p[i]][p[i + 1]]
            if total >= ans:
                break
        else:
            if total < ans:
                ans = total
    print(ans)

if __name__ == '__main__':
    main()