package main

import (
    "strconv"
    "fmt"
    "gitee.com/johng/gf/g/encoding/ghash"
)

func main () {
    m := make(map[uint64]bool)
    for i := 0; i < 100000000; i++ {
        hash := ghash.BKDRHash64([]byte("key_" + strconv.Itoa(i)))
        if _, ok := m[hash]; ok {
            fmt.Printf("duplicated hash %d\n", hash)
        } else {
            m[hash] = true
        }
    }
}