PAST4D

from Fourth Algorithm Practical Skills Test PAST4D D - alter ego

• Thoughts.
  • Fill in the blanks from the end
  • If there’s an empty space that’s in contact with the edge, that length is the minimum required.
  • Count the number of blanks
  • Tip: If the longest blank is less than or equal to the sum of the blanks at both ends, then moving to fill in the blanks at both ends is sufficient.
• supplement - The order of operation is irrelevant.
• Official Explanation
  • 50 x 50 so you can explore the whole area. python

def solve(N, S):
    spaces = []
    if S[0] == ord("#"):
        spaces.append(0)
        state = "BLOCK"
    else:
        state = "SPACE"
    c = 0

    for i in range(N):
        if state == "SPACE":
            if S[i] == ord("."):
                c += 1
            else:
                spaces.append(c)
                state = "BLOCK"
        else:
            if S[i] == ord("."):
                state = "SPACE"
                c = 1
            else:
                pass
    if state == "BLOCK":
        spaces.append(0)
    else:
        spaces.append(c)

    m = max(spaces)
    if m > spaces[0] + spaces[-1]:
        print(spaces[0], m - spaces[0])
    else:
        print(spaces[0], spaces[-1])

---

This page is auto-translated from /nishio/PAST4D using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.