This code has a little bug. This is the code fixed:

long arrayManipulation(int n, vector> queries) {
  vector<long> v(n, 0);
  for(vector<int> q: queries)
  {
    v[q[0]-1] += q[2];
    if (q[1] < v.size()) v[q[1]] -= q[2];
  }

  long max = 0;
  long sum = 0;

  for(long l: v)
  {
    sum += l;
    if(max < sum)
    {
        max = sum;
    }
  }

  return max;
}