Ladders

import sys
from collections import deque, defaultdict, Counter
from heapq import heappush, heappop, heapify
from bisect import bisect_left, bisect_right
from itertools import permutations, combinations, product, accumulate, groupby
from functools import lru_cache, cmp_to_key, reduce
from math import gcd, isqrt, comb, inf, pi, sqrt, atan2, hypot


def main():
    data = sys.stdin.buffer.read().split(); idx = 0
    n = int(data[idx]); idx += 1
    # n, m = map(int, data[idx:idx + 2]); idx += 2
    a = list(map(int, data[idx:idx + n])); idx += n
    # s = data[idx].decode(); idx += 1                  # strings

    # for _ in range(m):
    #     a, b = map(int, data[idx:idx + 2]); idx += 2

    # g = [data[idx + i].decode() for i in range(n)]; idx += n  # grid of n rows, no spaces, strings

    # input = sys.stdin.readline
    # n, m = map(int, input().split())
    # s = input().strip()  # strip removes the trailing newline
    # for line in sys.stdin:  # read until EOF

    out = []
    idx_of_the_num = [0]*(n+1)
    for i in range(n):
        idx_of_the_num[a[i]] = i



    time_to_get = [i for i in range(n)]

    for i in range(n-1):
        t = time_to_get[i]
        val = a[i]

        time_to_get[i+1] = min(time_to_get[i+1], t+1)

        jump = val + val
        while jump < n:
            time_to_get[jump] = min(time_to_get[jump], t+1)
            jump += val



    print(time_to_get[-1])
    # sys.stdout.write("\n".join(map(str, out)) + "\n")  # one value per line
    # print(*out)                                      # space separated on one line
    # print(f"{ans:.6f}")                              # float with 6 decimals
    # print("\n".join("".join(row) for row in g))      # grid of chars


main()

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

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Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: ACCEPTED

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Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

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Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

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Test 19

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Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: WRONG ANSWER

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

Test 47

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Test 66

Verdict: ACCEPTED

Test 67

Verdict: WRONG ANSWER

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Verdict: WRONG ANSWER

Test 71

Verdict: WRONG ANSWER