题解 | 小红的正整数构造

package main

import (
    "fmt"
)

func main() {
    var l, r, x int
    fmt.Scan(&l,&r,&x)
    v := -1
    if l%x == 0 {
        v = l
    } else {
        v = (l/x + 1) * x
        if v > r {
            v = -1
        }
    }
    fmt.Println(v)

}