Lennot

global k
k = 999999999999

def f(n, v, p, r, t, e, s, x):
    global k
    if (v[e][s] == -1): return k
    if (k <= x + (t % 2)*v[e][s]): return k
    if (s == n):
        k = x + (t % 2)*v[e][s]
        return 0
    if (t % 2 == 0):
        if (p[s] >= 0 and p[s] <= x): return k
        p[s] = x
    else:
        x += v[e][s]
        if (r[s] >= 0 and r[s] <= x): return k
        r[s] = x
    y = x
    for i in range(1, n+1):
        y += f(n, v, p, r, (t+1)%2, s, i, x)
    return y

n, m = [int(x) for x in input().split(" ")]
v = [[-1 for j in range(n+1)] for i in range(n+1)]
p = [-1 for i in range(n+1)]
r = [-1 for i in range(n+1)]
for i in range(m):
    a, b, h = [int(x) for x in input().split(" ")]
    if (v[a][b] >= 0 and v[a][b] <= h): continue
    v[a][b] = h
v[0][1] = 0
f(n,v,p,r,0,0,1,0)
print(k)

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 3

Verdict: RUNTIME ERROR

Test 12

Group: 3

Verdict: RUNTIME ERROR

Test 13

Group: 3

Verdict: RUNTIME ERROR

Test 14

Group: 3

Verdict: RUNTIME ERROR

Test 15

Group: 3

Verdict: RUNTIME ERROR

Test 16

Group: 3

Verdict: RUNTIME ERROR

Test 17

Group: 3

Verdict: RUNTIME ERROR