Problem:
Score : 800 points

Problem Statement

Let’s take a prime P = 200\,003.
You are given N integers A_1, A_2, \ldots, A_N.
Find the sum of ((A_i \cdot A_j) \bmod P) over all N \cdot (N-1) / 2 unordered pairs of elements (i < j).

Please note that the sum isn't computed modulo P.

Constraints

2 \leq N \leq 200\,000

0 \leq A_i < P = 200\,003

All values in input are integers.

Input

Input is given from Standard Input in the following format.

N
A_1 A_2 \cdots A_N

Output

Print one integer — the sum over ((A_i \cdot A_j) \bmod P).

Sample Input 1

4
2019 0 2020 200002

Sample Output 1

474287

The non-zero products are:

2019 \cdot 2020 \bmod P = 78320

2019 \cdot 200002 \bmod P = 197984

2020 \cdot 200002 \bmod P = 197983

So the answer is 0 + 78320 + 197984 + 0 + 0 + 197983 = 474287.

Sample Input 2

5
1 1 2 2 100000

Sample Output 2

600013

Solution in C (GCC 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>


int main() {
	int n ;
	scanf("%d", &n);


	int a[n];
	for (int i = 0 ; i < n ; i++) {
		scanf("%d", &a[i]);
	}

	long long  sum = 0 ;
	long long val;

	int p = 200003;
	for (long long i = 0 ; i < n ; i++) {
		for (long long j = i + 1 ; j < n ; j++) {
			val = (a[i] * a[j]) % p;
			sum += val;
		}
	}

	printf("%lld", sum);


}