Leetcode Problem 1997. First Day Where You Have Been in All the Rooms

1997. First Day Where You Have Been in All the Rooms

Leetcode Solutions

Dynamic Programming Approach

  1. Initialize a list dp of length n with all elements set to 0. dp[0] is set to 0 since we start in room 0 on day 0.
  2. Iterate over the rooms from 1 to n-1.
  3. For each room i, calculate dp[i] based on the following rule:
    • If nextVisit[i-1] is i-1, we need 2 more days to visit i from i-1.
    • Otherwise, calculate the days needed to go back to nextVisit[i-1] and then return to i-1 and finally to i.
  4. The result is dp[n-1] modulo 10^9 + 7.
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Simulation with Memoization

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