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18 lines
291 B

package correct
// Returns the element of the slice that doesn't have a correspondant pair
func Unmatch(arr []int) int {
var quant int
for _, el := range arr {
quant = 0
for _, v := range arr {
if v == el {
quant++
}
}
if quant%2 != 0 {
return el
}
}
return -1
}