Getting a SIGSEGV error on codechef for this code - c

Question

Im trying to submit a solution for the problem FCTRL2(https://www.codechef.com/problems/FCTRL2) on codechef. On executing the code it sometimes gets executed successfully while sometimes it gives a SIGSEGV error. But when I submit it, it always shows wrong answer. Though the code gives correct answer when i run it on any other IDE.
#include <iostream>
#include <stdio.h>
using namespace std;
int main(void)
{
int testCases, i, j, k, n, num, digits, carry = 0, temp;
scanf("%d", &testCases);
int testArr[160];
for (i = 0; i < testCases; i++)
{
scanf("%d", &n);
num = n;
if (n == 0 || n == 1)
{
testArr[0] = 1;
digits = 1;
}
else
{
k = 0;
for (j = 10; n != 0; j = j * 10)
{
testArr[k] = n % j;
n = n / j;
k++;
}
digits = k;
for (j = 1; j < num; j++)
{
for (k = 0; k < digits; k++)
{
temp = testArr[k] * j + carry;
if (temp > 10)
{
testArr[k] = temp % 10;
carry = temp / 10;
}
else
{
testArr[k] = temp;
carry = 0;
}
}
if (carry > 10)
{
testArr[k] = carry % 10;
k++;
testArr[k] = carry / 10;
digits = k + 1;
carry = 0;
}
else if (carry > 0)
{
testArr[k] = carry;
digits = k + 1;
carry = 0;
}
}
}
for (k = (digits - 1); k >= 0; k--)
{
printf("%d", testArr[k]);
}
printf("\n");
}
return 0;
}