55 lines
929 B
Go
55 lines
929 B
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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)
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func partOneCalculateSumCalibrationValues(document []string) int {
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sum := 0
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for _, line := range document {
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sum = sum + calibrationValue(line)
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}
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return sum
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}
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func calibrationValue(line string) int {
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var digits []int
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for _, r := range []rune(line) {
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if (r >= '0') && (r <= '9') {
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digits = append(digits, int(r-'0'))
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}
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}
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if len(digits) == 0 {
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return 0
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}
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return (10 * digits[0]) + digits[len(digits)-1]
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}
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func calibrationDocument(filename string) ([]string, error){
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file, err := os.Open(filename)
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if err != nil {
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return nil, fmt.Errorf("unable to open %q; %w", filename, err)
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}
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defer file.Close()
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var lines []string
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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lines = append(lines, scanner.Text())
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}
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if err := scanner.Err(); err != nil {
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return nil, fmt.Errorf("error scanning %q; %w", filename, err)
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}
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return lines, nil
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}
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