Buggy python submission (verdict: Time Limit Exceeded):
from itertools import permutations
def warshall_floyd(n,e):
  INF=float("inf")
  g=[[INF]*n for _ in range(n)]
  for i in range(n):g[i][i]=0
  for a,b,c in e:g[a][b],g[b][a]=c,c
  for k in range(n):
    for i in range(n):
      for j in range(n):g[i][j]=min(g[i][k]+g[k][j],g[i][j])
  return g
n,m,rl=map(int,input().split());r,e=list(map(lambda x:int(x)-1,input().split())),[]
for i in range(m):x,y,z=map(int,input().split());e.append([x-1,y-1,z])
d=warshall_floyd(n,e)
a=float("inf")
for i in permutations(range(rl)):
  aa=0
  for x,y in zip(i,i[1:]):aa+=d[r[x]][r[y]]
  a=min(a,aa)
print(a)

Fixed submission:
from itertools import permutations
n,m,rl=map(int,input().split());r=list(map(int,input().split()))
d=[[float("inf")for _ in range(n)]for _ in range(n)]
for i in range(m):
  x,y,z=map(int,input().split())
  d[x-1][y-1],d[y-1][x-1]=z,z
for i in range(n):d[i][i]=0
for k in range(n):
  for i in range(n):
    for j in range(n):d[i][j]=min(d[i][j],d[i][k]+d[k][j])
a=float("inf")
for i in permutations(r,rl):
  aa=0
  for j in range(rl-1):aa+=d[i[j]-1][i[j+1]-1]
  a=min(a,aa)
print(a)

Buggy python submission (verdict: Time Limit Exceeded):
def warshall_floyd(n,e):
  INF=float("inf")
  g=[[INF]*n for _ in range(n)]
  for i in range(n):g[i][i]=0
  for a,b,c in e:g[a][b],g[b][a]=c,c
  for k in range(n):
    for i in range(n):
      for j in range(n):g[i][j]=min(g[i][k]+g[k][j],g[i][j])
  return g
n,m,rl=map(int,input().split());r,e=list(map(int,input().split())),[]
for i in range(m):x,y,z=map(int,input().split());e.append([x-1,y-1,z])
d=warshall_floyd(n,e)
a=float("inf")
from itertools import permutations
for i in permutations(range(rl)):
  aa=0
  for x,y in zip(i,i[1:]):aa+=d[r[x]-1][r[y]-1]
  a=min(a,aa)
print(a)

Fixed submission:
from itertools import permutations
n,m,rl=map(int,input().split());r=list(map(int,input().split()))
d=[[float("inf")for _ in range(n)]for _ in range(n)]
for i in range(m):
  x,y,z=map(int,input().split())
  d[x-1][y-1],d[y-1][x-1]=z,z
for i in range(n):d[i][i]=0
for k in range(n):
  for i in range(n):
    for j in range(n):d[i][j]=min(d[i][j],d[i][k]+d[k][j])
a=float("inf")
for i in permutations(r,rl):
  aa=0
  for j in range(rl-1):aa+=d[i[j]-1][i[j+1]-1]
  a=min(a,aa)
print(a)

Buggy python submission (verdict: Time Limit Exceeded):
from itertools import permutations
def warshall_floyd(n,e):
  INF=float("inf")
  g=[[INF]*n for _ in range(n)]
  for i in range(n):g[i][i]=0
  for a,b,c in e:g[a][b],g[b][a]=c,c
  for k in range(n):
    for i in range(n):
      for j in range(n):g[i][j]=min(g[i][k]+g[k][j],g[i][j])
  return g
n,m,rl=map(int,input().split());r,e=list(map(int,input().split())),[]
for i in range(m):x,y,z=map(int,input().split());e.append([x-1,y-1,z])
d=warshall_floyd(n,e)
a=float("inf")
for i in permutations(range(rl)):
  aa=0
  for x,y in zip(i,i[1:]):aa+=d[r[x]-1][r[y]-1]
  a=min(a,aa)
print(a)

Fixed submission:
from itertools import permutations
n,m,rl=map(int,input().split());r=list(map(int,input().split()))
d=[[float("inf")for _ in range(n)]for _ in range(n)]
for i in range(m):
  x,y,z=map(int,input().split())
  d[x-1][y-1],d[y-1][x-1]=z,z
for i in range(n):d[i][i]=0
for k in range(n):
  for i in range(n):
    for j in range(n):d[i][j]=min(d[i][j],d[i][k]+d[k][j])
a=float("inf")
for i in permutations(r,rl):
  aa=0
  for j in range(rl-1):aa+=d[i[j]-1][i[j+1]-1]
  a=min(a,aa)
print(a)

Buggy python submission (verdict: Time Limit Exceeded):
from itertools import permutations
n,m,rl=map(int,input().split());r=list(map(int,input().split()))
d=[[float("inf")for _ in range(n)]for _ in range(n)]
for i in range(m):
  x,y,z=map(int,input().split())
  d[x-1][y-1],d[y-1][x-1]=z,z
for i in range(n):d[i][i]=0
for k in range(n):
  for i in range(n):
    for j in range(n):d[i][j]=min(d[i][j],d[i][k]+d[k][j])
a=float("inf")
for i in permutations(r,rl):
  aa=0
  for j in range(rl-1):aa+=d[i[j]-1][i[j+1]-1]
  a=min(a,aa)
print(a)

Fixed submission:
from itertools import permutations
n,m,rl=map(int,input().split());r=list(map(int,input().split()))
d=[[float("inf")for _ in range(n)]for _ in range(n)]
for i in range(m):
  x,y,z=map(int,input().split())
  d[x-1][y-1],d[y-1][x-1]=z,z
for i in range(n):d[i][i]=0
for k in range(n):
  for i in range(n):
    for j in range(n):d[i][j]=min(d[i][j],d[i][k]+d[k][j])
a=float("inf")
for i in permutations(r,rl):
  aa=0
  for j in range(rl-1):aa+=d[i[j]-1][i[j+1]-1]
  a=min(a,aa)
print(a)