Leetcode Problem 1326. Minimum Number of Taps to Open to Water a Garden

Algorithm

1. Initialize an array max_reach of size n + 1 to store the maximum reach for each position.
2. Iterate over each tap to update max_reach with the rightmost position each tap can reach.
3. Initialize taps to 0, curr_end to 0, and next_end to 0.
4. Iterate through the garden using a variable i.
   • If i is greater than next_end, return -1 (the garden cannot be watered).
   • If i is greater than curr_end, increment taps and update curr_end to next_end.
   • Update next_end with the maximum of its current value and max_reach[i].
5. Return taps as the minimum number of taps needed.