chunk.test.go

package main

import (
	"fmt"
)

func one(n int64) {
	ids := []int64{}
	for i := int64(1); i <= n; i++ {
		ids = append(ids, i)
	}

	chunkSize := len(ids)
	if chunkSize > 100 {
		chunkSize = len(ids) / 10
	}
	var lastEnd int64
	seen := map[int64]bool{}
	for startIndex := 0; startIndex < len(ids); startIndex += chunkSize {
		endIndex := startIndex + chunkSize - 1
		if endIndex >= len(ids) {
			endIndex = len(ids) - 1
		}

		start, end := ids[startIndex], ids[endIndex]
		fmt.Println(start, end)

		if lastEnd != 0 && start != lastEnd+1 {
			panic("missing")
		}
		for i := start; i <= end; i++ {
			seen[i] = true
		}

		lastEnd = end
	}
	if len(ids) != len(seen) {
		panic("missing 2")
	}
}

func main() {
	for i := int64(1); i <= 10000; i++ {
		one(i)
	}
}