gaspersic/learngo
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

refactor: slices 26th exercise

Browse Source
This commit is contained in:
Inanc Gumus
2019-08-18 14:43:37 +03:00
parent 552a6a6cf7
commit 55419e59b7
2 changed files with 115 additions and 120 deletions
Download Patch File Download Diff File Expand all files Collapse all files

75
16-slices/exercises/26-print-daily-requests/solution/main.go
View File

@ -13,24 +13,22 @@ import (
)
func main() {
//
// DAILY REQUESTS DATA
//
reqs := []int{
500, 600, 250,
200, 400, 50,
900, 800, 600,
750, 250, 100,
100, 150,
}
//
// There are 3 requests per day
//
// There are 3 request totals per day
const N = 3
// DAILY REQUESTS DATA (PER 8-HOUR)
reqs := []int{
500, 600, 250, // 1st day
200, 400, 50, // 2nd day
900, 800, 600, // 3rd day
750, 250, 100, // 4th day
}
// ================================================
// Allocate a slice efficiently with the exact size needed.
//
// Allocate the slice efficiently with the exact size needed
// Find the `size` automatically using the `reqs` slice.
// Do not type it manually.
//
l := len(reqs)
size := l / N
@ -38,44 +36,49 @@ func main() {
size++
}
daily := make([][]int, 0, size)
//
// ================================================
// ================================================
// Group the `reqs` per day into the slice: `daily`.
//
// Group the `reqs` per day into a slice named: `daily`
// So the daily will be:
// [
// [500, 600, 250]
// [200, 400, 50]
// [900, 800, 600]
// [750, 250, 100]
// ]
//
for N < len(reqs) {
daily = append(daily, reqs[:N]) // add the current batch of nums to the `groups`
reqs = reqs[N:] // move the slice pointer for the next batch
for N <= len(reqs) {
daily = append(daily, reqs[:N]) // append the daily requests
reqs = reqs[N:] // move the slice pointer for the next day
}
// ================================================
//
// Add the residual elements to the group (len(reqs) % N)
//
daily = append(daily, reqs)
// ================================================
// Don't touch the following code:
//
// Print the header:
//
// Print the header
fmt.Printf("%-10s%-10s\n", "Day", "Requests")
fmt.Println(strings.Repeat("=", 20))
//
// Print the data per day along with the totals:
//
// Print the data per day along with the totals
var grand int
for i, d := range daily {
for i, day := range daily {
var sum int
for _, q := range d {
sum += q
fmt.Printf("%-10d%-10d\n", i+1, q)
for _, req := range day {
sum += req
fmt.Printf("%-10d%-10d\n", i+1, req)
}
fmt.Println(strings.Repeat("-", 20))
fmt.Printf("%10s%-10d\n\n", "", sum)
fmt.Printf("%9s %-10d\n\n", "TOTAL:", sum)
grand += sum
}
fmt.Printf("%10s%-10d\n", "", grand)
fmt.Printf("%9s %-10d\n", "GRAND:", grand)
// ================================================
}