1 : PREPROCESSING To store sums of all strips of size k x 1
let stripSum = new Array ( n ) ; for ( let i = 0 ; i < n ; i ++ ) { stripSum [ i ] = new Array ( n ) ; } for ( let i = 0 ; i < n ; i ++ ) { for ( let j = 0 ; j < n ; j ++ ) { stripSum [ i ] [ j ] = 0 ; } }