You could reduce the array and check if the previous value is equal to the actual value. function sumSame(arrayA, arrayB) { var i, l = arrayA.length, resultA = [], resultB = []; for (i = 0; i < l; i++) { if (arrayA[i] === arrayA[i – 1]) { resultB[resultB.length – 1] += arrayB[i]; } else … Read more
Time for a crash course on arrays in C. First of all, let’s fix the initializer for the array: int a[3][4] = { { 1, 2, 3, 4}, { 5, 6, 7, 8}, { 9, 10, 11, 12} }; This defines a 3-element array of 4-element arrays of int. The type of the expression a … Read more
You have to: read first line split it to get dimensions read next lines (regards dimensions) read special char (@) repeat Reading first array you have there: static void readFile() throws IOException { BufferedReader reader; reader = new BufferedReader(new FileReader(“file.txt”)); String firstDimension = reader.readLine(); String[] split = firstDimension.split(” “); int firstX = Integer.parseInt(split[0]); int firstY … Read more
An approach should consider breaking the OP’s entire task into two separate ones. Within an intermediate step one firstly does reduce the list of material items into a map of (grouped) material items. The final step does a map–reduce on the values of the intermediate result, where the reduce task is responsible for summing up … Read more
You are looking for array_intersect() $array1 = [‘apple’];; $array2 = [‘apple’, ‘orange’]; $result = array_intersect($array1, $array2); print_r($result); 1 solved Return only value that exists in array php
According to the C++ Standard (4.2 Array-to-pointer conversion) 1 An lvalue or rvalue of type “array of N T” or “array of unknown bound of T” can be converted to a prvalue of type “pointer to T”. The result is a pointer to the first element of the array. So for example if you have … Read more
You can use something like this: a.flat_map{|x| x.in_groups_of(a.max_by(&:size).size, 0)}.transpose.map(&:sum) Or this: a.max_by(&:size).map.with_index{|_, i| a.sum{|x| x[i]||0}} 4 solved Sum of arrays of different size [closed]
You can do it like this to iterate the whole array column-wise: // Get the maximum number of columns among all rows. int maximumColumns = 0; for (double[] row : multi) { if (row.length > maximumColumns) { maximumColumns = row.length; } } for (int column = 0; column < maximumColumns ; column++) { for (int … Read more
There is no instance or extension method in .NET for a sequence of strings that will join them together as String.Join does. If you want such an extension method you’ll have to write it yourself (which should be trivially easy, given that internally all it needs to do is call string.Join). Enumerable.Join, which is the … Read more
I don’t know where you got data from, but you need to change it to array<int, 3> or make compareByValue a template: bool compareByValue(const array<int, 3> &a, const array<int, 3>&b) { return a[0] < b[0]; } 2 solved Sorting vector of arrays by array’s element
If your array-of-arrays only has one level, then you can just map it like this: var filtered = array.map(subarray => subarray.filter(el => el != null)); console.log(filtered); 1 solved How to remove null values from nested arrays
If you want the first element of an array, you should use reset. This function sets the pointer to the first element and returns it. $firstValue = reset($value[‘record’][‘records’]); Edit.. after reading your question again, it seems, you dont want the first element. You rather want this if (isset($value[‘record’][‘records’][0]) && is_array($value[‘record’][‘records’][0])) { // multiple return values … Read more
I probably interpret your question wrong, as this seems too easy: Determine into how many arrays the source array will be divided. (totalCount / elementsPerArray) For each array: Determine how many elements to put in it. (elementsRemaining / arraysRemaining) Copy those elements to a new array. In code: private static List<string[]> DivideStrings(int expectedStringsPerArray, string[] allStrings) … Read more
Why 5 is missing ? console.log(5 === “5”) indexOf(5) isn’t -1 because 5 and “5” are two different value ( indexOf uses strict equality ) MDN indexOf console.log([5].indexOf(5)) console.log([“5”].indexOf(5)) How can i match both 5 or “5” ? Check for both numeric and string value. var myArray = [“2”, “3”, 5] var found = []; … Read more
Use Array.reduce to calculate the sum const sum = array.reduce((acc, o) => acc + parseInt(o.value), 0) 2 solved sum all values of an object in an array of objects javascript