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![[LeetCode] 5461. Number of Substrings With Only 1s](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FawG26UQHc0w%2Fhqdefault.jpg%3Fsqp%3D-oaymwEjCOADEI4CSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE%3D%26rs%3DAOn4CLC2hjdtjLcBa-NYW7qmi5pD0gCdnQ&w=256&q=75)
