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How to decompose any permutation uniquely into k rotation products without common elements

I see the following theorem on page 3 of this book:

enter image description here

theorem 1.1

In addition to the identity permutation $left(begin{array}{l}
1,2, cdots, n \
1,2, cdots, n
end{array}right)$ (i.e. all elements are invariant), any permutation must be decomposed into the product of K rotations without common elements (i.e. the elements in any two rotations are different from each other, and the permutation is a rotation when k = 1), and the decomposition formula is unique (regardless of the order of the rotation factors).

The permutation $left(begin{array}{l}
1,2,3,4,5,6,7,8,9,10 \
3,5,4,1,2,6,8,10,7,9
end{array}right)$ in the book can be decomposed into the product of three rotations of $(1,3,4)(2,5)(7,8,10,9)$ without common elements.

wordpress.org – Woocommerce: how to make only certain products shippable?

I’m new to Woocommerce and am struggling to find a way to make only certain products shippable. I am creating an e-shop of physical products (food) and I want to configure that some of these products could be shipped and others could not (because some are too delicate). That is said, when the customer choose a non-shippable product he can pay it on the eshop and has to collect it in the store but can’t get it delivered.

Is there is way to specify a certain property when creating a new product. Or do I need to download a pluggin? Which one could make the trick?

Thank you

Iterative processing of Sentinel-2 for obtaining snow cover products in R

I´m working snow cover issues with Sentinel-2 images. I have managed to make a script on R to process the images 1 by 1 and get the snow cover product according the parameters given in Gascoin et al. 2019: NDSI > 0.4 and reflectance in red band >0.1.
I would like to be able to make this process with all the images in a directory automatically. Does anyone know how could i do it ???
My code is the following:

#Packages needed
library(RStoolbox)
library(raster)
library(ggplot2)
library(gridExtra)
library(rgdal)

setwd('/Desktop/images/s2') #Working directory

sentinel <-"20170225T105021_20170225T105020_T30TYN.tif" #image

swir <- raster(sentinel, band = 12) # Swir band
green <- raster(sentinel, band = 3) # green band
red <- raster(sentinel, band = 4) #red band

ndsi <- (green-swir)/(green+swir) # NDSI calculation 
ndsi(ndsi>1) <- 1; ndsi(ndsi< (-1)) <- -1 # rescale for avoiding outliers

r <- stack(ndsi, red) # layerstack with ndsi and red band

snow_reclass <- function(x1,x2) { #reclass function with snow cover paranmeters
  ifelse( x1 > 0.4 & x2 > 0.1, 1, 0)
}

snowcover <- overlay(r, fun=snow_reclass) #Apply the function to the layer stack (red and NDSI)

writeRaster(snowcover, "snowcover170225.tiff", #Export the result
            format="GTiff",
            overwrite=TRUE,
            NAflag=-9999)

Selling – Digital Products Web Store

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javascript – Largest Triple Products without using sort?

I implemented the Largest Triple Products algorithm, but I use sort which makes my time complexity O(nlogn). Is there a way to implement it without a temporary sorted array?

The problem:
You’re given a list of n integers arr(0..(n-1)). You must compute a list output(0..(n-1)) such that, for each index i (between 0 and n-1, inclusive), output(i) is equal to the product of the three largest elements out of arr(0..i) (or equal to -1 if i < 2, as arr(0..i) then includes fewer than three elements).
Note that the three largest elements used to form any product may have the same values as one another, but they must be at different indices in arr.

Example:

var arr_2 = (2, 4, 7, 1, 5, 3);
var expected_2 = (-1, -1, 56, 56, 140, 140);

My solution:

function findMaxProduct(arr) {
  // Write your code here
  if(!arr || arr.length === 0)  return ();
  
  let helper = arr.slice();
  helper.sort((a,b)=>a-b);   // THIS IS THE SORT
  
  let ans = ();
  let prod = 1;
  for(let i=0; i<arr.length; i++) {
    if(i < 2) {
      prod *= arr(i);
      ans.push(-1);
    }
    else {
      if(i === 3) {
        prod *= arr(i);
        ans.push(prod);
      } else if(arr(i) < helper(0)) {
        ans.push(prod);
      } else {
        const min = helper.shift();
        prod /= min;
        prod *= arr(i);
        ans.push(prod);
      }
    }
  }
  
  return ans;
}

magento2 – Magento 2 – Get custom attribute of child products of a configurable

I tried to get value of my custom attribute of child products in product details of a configurable but without success.

This is my code but not work:

$simple_collection = $_product->getTypeInstance()->getUsedProducts($_product);
foreach($simple_collection as $simple_product){
echo $simple_product->getResource()->getAttribute('my_custom_attribute')->getFrontend()->getValue($simple_product);
}

Thanks for any help

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