Solution 2 for Scaler Topics Fortnightly Contest - 12

This article is part of the Scaler Topics Fortnightly Contest - 12

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Solution Approach

• The subarrays which have no zero elements in it will have zero mex.
• So, we can find the number of subarray with no zeros in it and subtract it from the total number of subarrays.
• To find the above we can observe that between two consecutive zeros, all the subarrays will have no zeros in it.

Time Complexity:- $O(N)$

Space Complexity:- $O(1)$

C++ Implementation

Java Implementation

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Python Implementation