102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
package main
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import (
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"fmt"
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"strings"
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)
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// ---------------------------------------------------------
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// EXERCISE: Print daily requests
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//
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// You've got request logs of a web server. The log data
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// contains 8-hourly totals per each day. Find and print
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// the total requests per day, as well as the grand total.
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//
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// See the `reqs` slice and the steps in the code below.
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//
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//
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// EXPECTED OUTPUT
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//
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// Please run `solution/main.go` to see the expected
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// output.
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//
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// go run solution/main.go
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//
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// ---------------------------------------------------------
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func main() {
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// ================================================
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// Don't touch this code.
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// There are 3 request totals per day (8-hourly)
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const N = 3
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// DAILY REQUESTS DATA (8-HOURLY TOTALS PER DAY)
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reqs := []int{
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500, 600, 250, // 1st day: 1350 requests
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200, 400, 50, // 2nd day: 650 requests
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900, 800, 600, // 3rd day: 2300 requests
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750, 250, 100, // 4th day: 1100 requests
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// grand total: 5400 requests
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}
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// ================================================
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_ = reqs // remove this when you start
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// ================================================
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// Allocate a slice efficiently with the exact size needed.
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//
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// Find the `size` automatically using the `reqs` slice.
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// Do not type it manually.
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//
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// Change this code:
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size := 0 // you need to find the size.
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daily := make([][]int, 0, size)
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//
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// ================================================
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// ================================================
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// Group the `reqs` per day into the slice: `daily`.
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//
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// So the daily will be:
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// [
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// [500, 600, 250]
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// [200, 400, 50]
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// [900, 800, 600]
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// [750, 250, 100]
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// ]
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//
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// Change this code:
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//
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// for N < len(reqs) {
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// append the daily requests to `daily` per 8-hour groups
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// }
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// ================================================
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// ================================================
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// Don't touch the following code:
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// Print the header
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fmt.Printf("%-10s%-10s\n", "Day", "Requests")
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fmt.Println(strings.Repeat("=", 20))
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// Print the data per day along with the totals
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var grand int
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for i, day := range daily {
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var sum int
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for _, req := range day {
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sum += req
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fmt.Printf("%-10d%-10d\n", i+1, req)
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}
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fmt.Printf("%9s %-10d\n\n", "TOTAL:", sum)
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grand += sum
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}
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fmt.Printf("%9s %-10d\n", "GRAND:", grand)
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// ================================================
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}
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