my approach is also similar but i am getting segmentation fault in some test cases. please tell the problem.

long arrayManipulation(int n, vector> queries) {

  long a[n]={0};
for(int i=0;i<queries.size();i++)
{
    a[queries[i][0]-1]+=queries[i][2];
    if(queries[i][1]<n)
    a[queries[i][1]]-=queries[i][2];
}
long ans=a[0];
for(int i=1;i<n;i++)
{
    a[i]+=a[i-1];
    ans=max(ans,a[i]);
}
return ans;

}