why am i getting sigsegv error everytime?

my code for turbo sort is #include<iostream> using namespace std; int main() {

int a[100],i,t,j,c;
cin>>t;
for(i=0;i<t;i++)
{
cin>>a[i];
}
for(i=0;i<t;i++)
{
for(j=0;j<t;j++)
{
if(a[i]<a[j])
{
c=a[j];
a[j]=a[i];
a[i]=c;
}
}
}
for(i=0;i<t;i++)
{
cout<<a[i];
}
return 0;
} 
why is it showing runtime eroor??