Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
from itertools import permutations


def warshall_floyd(n, d):
    for i in np.arange(n):
        for j in np.arange(n):
            for k in np.arange(n):
                t = d[j, i] + d[i, k]
                if t < d[j, k]:
                    d[j, k] = t


N, M, R = np.fromstring(input(), dtype = np.int64, sep = ' ')
r = np.fromstring(input(), dtype = np.int64, sep = ' ')

d = np.full((N + 1, N + 1), 1000000000, dtype=np.int64)
for _ in np.arange(M):
    A, B, C = np.fromstring(input(), dtype = np.int64, sep = ' ')
    d[A, B] = C
    d[B, A] = C
warshall_floyd(N + 1, d)

result = np.int64(1000000000)
for p in permutations(r):
    t = np.int64(0)
    for i in range(R - 1):
        t += d[p[i], p[i + 1]]
    if t < result:
        result = t
print(result)


Fixed submission:
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j][k] = min(d[j][k], d[j][i] + d[i][k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
from itertools import permutations


def warshall_floyd(n, d):
    for i in np.arange(n):
        for j in np.arange(n):
            for k in np.arange(n):
                t = d[j, i] + d[i, k]
                if t < d[j, k]:
                    d[j, k] = t


N, M, R = np.fromstring(input(), dtype = np.int64, sep = ' ')
r = np.fromstring(input(), dtype = np.int64, sep = ' ')

d = np.full((N + 1, N + 1), 1000000000, dtype=np.int64)
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A, B] = C
    d[B, A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i], p[i + 1]]
    result = min(result, t)
print(result)


Fixed submission:
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j][k] = min(d[j][k], d[j][i] + d[i][k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j, k] = min(d[j, k], d[j, i] + d[i, k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = np.full((N + 1, N + 1), 1000000000, dtype=np.int64)
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A, B] = C
    d[B, A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i], p[i + 1]]
    result = min(result, t)
print(result)


Fixed submission:
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j][k] = min(d[j][k], d[j][i] + d[i][k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)

Buggy python submission (verdict: Runtime Error):
package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

//
var (
	N int
	M int
	R int
	r []int
	d [][]int
)

func min(x, y int) int {
	if x < y {
		return x
	}
	return y
}

func fillInts(a []int, x int) {
	for i := 0; i < len(a); i++ {
		a[i] = x
	}
}

func warshallFloyd(n int, d [][]int) {
	for k := 0; k < n; k++ {
		for i := 0; i < n; i++ {
			for j := 0; j < n; j++ {
				d[i][j] = min(d[i][j], d[i][k]+d[k][j])
			}
		}
	}
}

func swap(a []int, i int, j int) {
	x, y := a[i], a[j]
	a[i], a[j] = y, x
}

func permtationsImpl(a []int, i int, f func(a []int)) {
	if i == len(a)-1 {
		f(a)
		return
	}
	permtationsImpl(a, i+1, f)
	for j := i + 1; j < len(a); j++ {
		swap(a, i, j)
		permtationsImpl(a, i+1, f)
		swap(a, i, j)
	}
}

func permtations(a []int, f func(a []int)) {
	permtationsImpl(a, 0, f)
}

func main() {
	defer flush()

	N = readInt()
	M = readInt()
	R = readInt()
	r = make([]int, R)
	for i := 0; i < R; i++ {
		r[i] = readInt()
	}

	d = make([][]int, N+1)
	for i := 0; i < N+1; i++ {
		d[i] = make([]int, N+1)
		fillInts(d[i], math.MaxInt32)
		d[i][i] = 0
	}

	for i := 0; i < M; i++ {
		A := readInt()
		B := readInt()
		C := readInt()
		d[A][B] = C
		d[B][A] = C
	}
	warshallFloyd(N+1, d)

	result := math.MaxInt64
	permtations(r, func(a []int) {
		t := 0
		for i := 0; i < R-1; i++ {
			t += d[a[i]][a[i+1]]
		}
		result = min(result, t)
	})
	println(result)
}

const (
	ioBufferSize = 1 * 1024 * 1024 // 1 MB
)

var stdinScanner = func() *bufio.Scanner {
	result := bufio.NewScanner(os.Stdin)
	result.Buffer(make([]byte, ioBufferSize), ioBufferSize)
	result.Split(bufio.ScanWords)
	return result
}()

func readString() string {
	stdinScanner.Scan()
	return stdinScanner.Text()
}

func readInt() int {
	result, err := strconv.Atoi(readString())
	if err != nil {
		panic(err)
	}
	return result
}

var stdoutWriter = bufio.NewWriter(os.Stdout)

func flush() {
	stdoutWriter.Flush()
}

func printf(f string, args ...interface{}) (int, error) {
	return fmt.Fprintf(stdoutWriter, f, args...)
}

func println(args ...interface{}) (int, error) {
	return fmt.Fprintln(stdoutWriter, args...)
}


Fixed submission:
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j][k] = min(d[j][k], d[j][i] + d[i][k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)

Buggy python submission (verdict: Time Limit Exceeded):
from itertools import permutations


def warshall_floyd(n, d):
    from builtins import min
    for i in range(n):
        di = d[i]
        for j in range(n):
            dj = d[j]
            for k in range(n):
                dj[k] = min(dj[k], dj[i] + di[k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)


Fixed submission:
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j][k] = min(d[j][k], d[j][i] + d[i][k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)

Buggy python submission (verdict: Time Limit Exceeded):
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j][k] = min(d[j][k], d[j][i] + d[i][k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)


Fixed submission:
from itertools import permutations


def warshall_floyd(n, d):
    for i in range(n):
        for j in range(n):
            for k in range(n):
                d[j][k] = min(d[j][k], d[j][i] + d[i][k])


N, M, R = map(int, input().split())
r = list(map(int, input().split()))

d = [[1000000000] * (N + 1) for _ in range(N + 1)]
for _ in range(M):
    A, B, C = map(int, input().split())
    d[A][B] = C
    d[B][A] = C
warshall_floyd(N + 1, d)

result = 1000000000
for p in permutations(r):
    t = 0
    for i in range(R - 1):
        t += d[p[i]][p[i + 1]]
    result = min(result, t)
print(result)