我这个为啥不行呢，哪里错了

#include<iostream>

#include<string>

#include<cstring>

using namespace std;

int main() {

int ci[21] = { 1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,1048576 };

int n;

cin >> n;

for (int i = 0;i < n;i++)

{

int num;

cin >> num;

if (num > 1048576)

{

printf("-1");

continue;

}

int jie=0;

int cishu;

for (int j = 0;j <= 20;j++)

{

if (num > ci[j] && num <= ci[j + 1])

jie = j;

}

cishu = (ci[jie+1] - num) + 20 - jie-1;

printf("%d\n", cishu);

}

return 0;

}

二的次幂是能倍数上去的，所以我先加到2的次幂再乘