/**
 * It sets the p[i] equal to the sum of c[0] through c[i-1].
 *
 * @param {Array}   ptr             The Sparse Matrix ptr array
 * @param {Array}   c               The Sparse Matrix ptr array
 * @param {Number}  n               The number of columns
 */
export declare function csCumsum(ptr: number[], c: number[], n: number): number;
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