Last list item
Last list item is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
- Task
List = [6, 81, 243, 14, 25, 49, 123, 69, 11]
Find two smallest items, summarize them, add to the end of list and delete them.
Repeat it until list contains one element.
Show the steps and last item on this page.
C
<lang c>#include <stdio.h>
- include <stdlib.h>
int compare(const void *a, const void *b) {
int aa = *(const int *)a; int bb = *(const int *)b; if (aa < bb) return -1; if (aa > bb) return 1; return 0;
}
int main() {
int a[] = {6, 81, 243, 14, 25, 49, 123, 69, 11}; int isize = sizeof(int); int asize = sizeof(a) / isize; int i, sum; while (asize > 1) { qsort(a, asize, isize, compare); sum = a[0] + a[1]; for (i = 2; i < asize; ++i) a[i-2] = a[i]; a[asize - 2] = sum; asize--; } printf("Last item is %d.\n", a[0]); return 0;
}</lang>
- Output:
Last item is 621.
Go
<lang go>package main
import (
"fmt" "sort"
)
func main() {
a := []int{6, 81, 243, 14, 25, 49, 123, 69, 11} for len(a) > 1 { sort.Ints(a) fmt.Println("Sorted list:", a) sum := a[0] + a[1] fmt.Printf("Two smallest: %d + %d = %d\n", a[0], a[1], sum) a = append(a, a[0]+a[1]) a = a[2:] } fmt.Println("Last item is", a[0], "\b.")
}</lang>
- Output:
Sorted list: [6 11 14 25 49 69 81 123 243] Two smallest: 6 + 11 = 17 Sorted list: [14 17 25 49 69 81 123 243] Two smallest: 14 + 17 = 31 Sorted list: [25 31 49 69 81 123 243] Two smallest: 25 + 31 = 56 Sorted list: [49 56 69 81 123 243] Two smallest: 49 + 56 = 105 Sorted list: [69 81 105 123 243] Two smallest: 69 + 81 = 150 Sorted list: [105 123 150 243] Two smallest: 105 + 123 = 228 Sorted list: [150 228 243] Two smallest: 150 + 228 = 378 Sorted list: [243 378] Two smallest: 243 + 378 = 621 Last item is 621.
Ring
<lang ring> see "working..." + nl
List = [6,81,243,14,25,49,123,69,11] Temp = []
while true
Temp = sort(List) first = Temp[1] second = Temp[2] ind1 = find(List,first) ind2 = find(List,second) if ind1 < ind2 del(List,ind2) del(List,ind1) else del(List,ind1) del(List,ind2) ok sum = first + second add(List,sum) if len(List) = 1 exit ok showList(first,second,List)
end
see "Last item is: " +List[1] + nl see "done..." + nl
func showList(first,second,List)
see "two smallest number is = " + first + " " + second + nl see "List = " showArray(List)
func showArray(array)
txt = "" see "[" for n = 1 to len(array) txt = txt + array[n] + "," next txt = left(txt,len(txt)-1) txt = txt + "]" see txt + nl
</lang>
- Output:
working... two smallest number is = 6 11 List = [81,243,14,25,49,123,69,17] two smallest number is = 14 17 List = [81,243,25,49,123,69,31] two smallest number is = 25 31 List = [81,243,49,123,69,56] two smallest number is = 49 56 List = [81,243,123,69,105] two smallest number is = 69 81 List = [243,123,105,150] two smallest number is = 105 123 List = [243,150,228] two smallest number is = 150 228 List = [243,378] Last item is: 621 done...
Wren
<lang ecmascript>var a = [6, 81, 243, 14, 25, 49, 123, 69, 11]
while (a.count > 1) {
a.sort() System.print("Sorted list: %(a)") var sum = a[0] + a[1] System.print("Two smallest: %(a[0]) + %(a[1]) = %(sum)") a.add(sum) a = a[2..-1]
}
System.print("Last item is %(a[0]).")</lang>
- Output:
Sorted list: [6, 11, 14, 25, 49, 69, 81, 123, 243] Two smallest: 6 + 11 = 17 Sorted list: [14, 17, 25, 49, 69, 81, 123, 243] Two smallest: 14 + 17 = 31 Sorted list: [25, 31, 49, 69, 81, 123, 243] Two smallest: 25 + 31 = 56 Sorted list: [49, 56, 69, 81, 123, 243] Two smallest: 49 + 56 = 105 Sorted list: [69, 81, 105, 123, 243] Two smallest: 69 + 81 = 150 Sorted list: [105, 123, 150, 243] Two smallest: 105 + 123 = 228 Sorted list: [150, 228, 243] Two smallest: 150 + 228 = 378 Sorted list: [243, 378] Two smallest: 243 + 378 = 621 Last item is 621.