为什么最后一个测试点tle了？？？？？

#include <bits/stdc++.h>
  
using namespace std;

long d[11]={},n,k=0,a=1;

int main()
{	
memset (d,0,sizeof(n));	
cin >> n;    
for (int i = 1;i <= 10;i++) d [i] = n / a % 10,a *= 10;    
a = 1000000000;    
for (int i = 1;i <= 10;i++) k += d [i] * a,a /= 10;    
while (k%10 == 0) k /= 10;    
cout << k;        
return 0;
}