import sys
readline = sys.stdin.readline

def calc(h, G):
    inf = 10 ** 18
    dp0 = [-inf] * N
    dp1 = [-inf] * N
    dp0[0] = 0
    for i in range(N):
        for u in G[i]:
            if h[u] > h[i]:
                dp1[u] = max(dp1[u], dp0[i] + h[u] - h[i])
            else:
                dp0[u] = max(dp0[u], dp0[i], dp1[i])
    v = max(dp0[-1], dp1[-1])
    if v < 0:
        return -1
    else:
        return v           
    

N, M = map(int, input().split())
H = list(map(int, input().split()))
G1 = [[] for i in range(N)]
G2 = [[] for i in range(N)]
for i in range(M):
    X, Y = map(int, input().split())
    G1[X - 1].append(Y - 1)
    G2[N - Y].append(N - X)
    
ans1= calc(H, G1)
H.reverse()
ans2 = calc(H, G2)
print(ans1)
print(ans2)