samples = [([1,2,3,4,5,6,7,8,9], [4,5,6,7]),
           ([1,-2,-3,-4,-5,-6,10], [-4,-5,-6,10])]

def solve(task, k):
    i = 0
    j = 0
    s = 0
    predicateI = lambda s, k: s < k
    predicateJ = lambda s, k: s > k
    if k < 0:
        predicateI, predicateJ = predicateJ, predicateI
    while i < len(task) and j < len(task):
        if predicateI(s, k):
            s += task[i]
            i += 1
        if predicateJ(s, k):
            s -= task[j]
            j += 1
        if s == k:
            return (i,j)
    return (-1,-1)


for task, solution in samples:
    k = sum(solution)
    i, j = solve(task, k)
    solved = sum(task[j:i])
    if solved != k:
        print("mistake! for {0}, {4} one of the right solutions is {1}, but was {2}, {3}".format(task, solution, (j,i), task[j:i], k))

print("all problems solved successfuly (or not)")