37 lines
525 B
Go
37 lines
525 B
Go
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package main
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import (
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"bufio"
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"bytes"
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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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)
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func main() {
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nums := []int{}
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f, err := ioutil.ReadFile("input")
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if err != nil {
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panic(err)
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}
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reader := bufio.NewReader(bytes.NewReader(f))
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for {
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line, err := reader.ReadString('\n')
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if err != nil {
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break
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}
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i, err := strconv.Atoi(strings.TrimSpace(line))
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if err != nil {
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panic(err)
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}
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for _, num := range nums {
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if i+num == 2020 {
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fmt.Printf("%d", i*num)
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return
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}
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}
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nums = append(nums, i)
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}
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}
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