Arrays-Max Value In Array

#1

why am i getting my test case # 4 wrong??

#include
using namespace std;
int main() {
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++)
{
cin>>a[i];
}
int big=0;
for(int i=0;i<n;i++)
{
if(a[i]>big)
big=a[i];
}
cout<<big;

return 0;

}

#2

@ashigupta.gupta570 hey ashi give big=a[0]

#3

why?
plz explain am not able to understand.