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@@ -0,0 +1,41 @@
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "os"
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+ "strconv"
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+ "strings"
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+)
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+
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+func main() {
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+ input := bufio.NewScanner(os.Stdin)
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+ var output int
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+ var digits []int
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+ for input.Scan() {
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+ line := input.Text()
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+
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+ digits = []int{}
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+ values := strings.Split(line, " ")
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+ for _, v := range values {
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+ d, _ := strconv.Atoi(v)
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+ digits = append(digits, d)
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+ }
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+
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+ output = findRepeatNumber(digits)
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+ fmt.Println(output)
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+ }
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+}
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+
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+func findRepeatNumber(nums []int) int {
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+ var record = map[int]bool{}
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+ for _, v := range nums {
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+ if _, ok := record[v]; !ok {
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+ record[v] = true
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+ continue
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+ }
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+ return v
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+ }
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+
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+ return 0
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+}
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