func distinct(list vector.StringVector) [][2]string {
if len(list) == 0 {
return nil
}
var keys vector.StringVector
var vals vector.IntVector
for _, l := range list {
index := search(keys, l)
if index == -1 {
keys.Push(l)
vals.Push(1)
} else {
vals.Set(index, vals.At(index)+1)
}
}
m := make([][2]string, len(keys))
for i, k := range keys {
m[i][0] = k
m[i][1] = fmt.Sprint(vals.At(i))
}
return m
}