Sum of Subarray Minimums Leetcode

I have coded my solution and it is submitted successfully but the speed is very slow faster than 5% only.
Can u help me to Optimize it where I can optimize it .
Problem>>> https://leetcode.com/problems/sum-of-subarray-minimums/
My code>>>
https://ide.codingblocks.com/s/478121

hello @joshisanjay8467

yours solution is also O(N). and logic is also same as others are doing.

becuase of implementation it might be slow.

trying doing it in single pass (similar to histogram problem)