text: looping similar to matrix chain multiplication and updating both 2D arrays
code: for ( let L = 2 ; L <= len ; L ++ ) { for ( let i = 0 ; i < len - L + 1 ; i ++ ) { let j = i + L - 1 ; for ( let k = i ; k < j ; k ++ ) { let minTmp = 0 , maxTmp = 0 ;