1513 Number of Substrings With Only 1s

1513 Number of Substrings With Only 1s

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My other Leetcode solving videos (easy)

https://www.youtube.com/playlist?list=PLg9w7tItBlZt4oUpNyWU_0rOItlScu1_d

Leetcode solving videos (Medium):

https://www.youtube.com/playlist?list=PLg9w7tItBlZvMGxy-y1eXURPD6Ao6kkzA

Leetcode solving videos (Hard):

https://www.youtube.com/playlist?list=PLg9w7tItBlZt4JQmlkGD3M5idZn14NyL6

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