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47 lines
900 B
Go
47 lines
900 B
Go
package main
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import (
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"crypto/md5"
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"fmt"
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"io"
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)
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func getCounts(userIDs []string) map[string]int {
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m := map[string]int{}
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for _, id := range userIDs {
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if _, ok := m[id]; !ok {
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m[id] = 0
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}
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m[id]++
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}
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return m
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}
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// don't edit below this line
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func test(userIDs []string, ids []string) {
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fmt.Printf("Generating counts for %v user IDs...\n", len(userIDs))
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counts := getCounts(userIDs)
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fmt.Println("Counts from select IDs:")
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for _, k := range ids {
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v := counts[k]
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fmt.Printf(" - %s: %d\n", k, v)
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}
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fmt.Println("=====================================")
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}
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func main() {
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userIDs := []string{}
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for i := 0; i < 10000; i++ {
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h := md5.New()
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io.WriteString(h, fmt.Sprint(i))
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key := fmt.Sprintf("%x", h.Sum(nil))
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userIDs = append(userIDs, key[:2])
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}
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test(userIDs, []string{"00", "ff", "dd"})
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test(userIDs, []string{"aa", "12", "32"})
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test(userIDs, []string{"bb", "33"})
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}
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