Leetcode Problem 2031. Count Subarrays With More Ones Than Zeros

2031. Count Subarrays With More Ones Than Zeros

Leetcode Solutions

Prefix Sum with Counting

  1. Initialize a counter to keep track of the occurrences of each prefix sum.
  2. Initialize a variable to keep track of the current prefix sum and set it to 0.
  3. Initialize a variable to keep track of the total count of subarrays with more 1s than 0s.
  4. Iterate through the input array, updating the prefix sum by adding 1 for each 1 encountered and subtracting 1 for each 0 (treated as -1).
  5. For each prefix sum encountered, add the count of all prefix sums less than the current prefix sum to the total count.
  6. Update the counter for the current prefix sum.
  7. Return the total count modulo 10^9 + 7.
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Cumulative Count with HashMap

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