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![Range Sum Query - Mutable [LC 307]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2F5T6lx4x_um8%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLBKJu8EyZYEMW89y2UJe5IeJaQj6A&w=256&q=75)