CompetitiveProgramming/yukicoder/15.py at main · ryusuke920/CompetitiveProgramming · GitHub

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from itertools import product
from bisect import bisect_right

n, s = map(int, input().split())
p = [int(input()) for _ in range(n)]

cnt = min(20, n)
item1 = []
bisect_item1 = []
for i in product([0, 1], repeat=cnt):
    money, item = 0, []
    for j in range(cnt):
        if i[j] == 1:
            money += p[j]
            item.append(j + 1)
    item1.append([money, item])
    bisect_item1.append(money)

cnt = max(0, n - 20)
item2 = []
bisect_item2 = []
for i in product([0, 1], repeat=cnt):
    money, item = 0, []
    for j in range(cnt):
        if i[j] == 1:
            money += p[j + 20]
            item.append(j + 21)
    item2.append([money, item])
    bisect_item2.append(money)

item2.sort(key=lambda x: x[0])
bisect_item2.sort()

ans = []
for money, item in item1:
    if money > s: continue
    p = bisect_right(bisect_item2, s - money)
    if money + bisect_item2[p - 1] == s:
        a = item
        b = item2[p - 1][1]
        ans.append(sorted(a + b))

ans.sort()
for i in ans:
    print(*i)