Leetcode Problem 2281. Sum of Total Strength of Wizards

2281. Sum of Total Strength of Wizards

Leetcode Solutions

Key approach of the solution

  1. Initialize variables for the answer and the modulo value (10^9 + 7).
  2. Create prefix sum and prefix-of-prefix sum arrays for the input array.
  3. Use a monotonic stack to find the left and right bounds for each element, where it is the minimum.
  4. Iterate over each element and calculate its contribution to the total strength based on the left and right bounds and the prefix sums.
  5. Update the answer with each element's contribution, using modular arithmetic to handle large numbers.
  6. Return the final answer modulo 10^9 + 7.
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Alternative approach using brute force

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