3790-smallest-all-ones-multiple

DevGod

Elf Vtuber

Caution

DevGod needs to write an editorial for this problem!

js

/**
 * @param {number} k
 * @return {number}
 */
var minAllOneMultiple = function(k) {
    if(k%2==0 || k%5==0){return -1;}
    let n = 0;
    for(let I = 1; I<=k; I++){
        n = (n*10 + 1)%k;
        if(n == 0){return I;}
    }
    return -1;
};