Code jam Affrical qualification round

store_credits.py

def process(credits, nitem, items, case):
    for i in range(nitem-1):
        for j in range(i+1,nitem):
            if int(items [i]) + int(items [j]) == credits:
                return "Case #{}: {} {}".format(case, i+1, j+1)

def credit_difference(credits, items):
    for item in items:
        yield int(item), credits - int(item)

def main():
    with open("A-large-practice.in") as fd:
        content = fd.read()
        lines = content.split('\n')
        n = int(lines[0])
        lines = lines[1:]
        i = 0
        for c in range(0,n):
            credits = int(lines[i])
            nitems = int(lines[i+1])
            items = list(map(int, lines [i+2].split (' ')))
            print(process(credits, nitems, items, c+1))

            # credit_gen = credit_difference(credits, items)
            # for item, diff in credit_gen:
            #     if diff in items:
            #         print("Case #{}: {} {}".format(c+1, items.index(item)+1,
            #                                        items.index(diff)+1))
            #         break
            i += 3

if __name__ == "__main__":
    main()