CodeForces 797B Odd sum

#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <queue>
#include <stack>
#include <vector>
#include <algorithm>
using namespace std;

int n;
int a[100010];

int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
	
	sort(a+1,a+1+n);
	int sum=0;
	for(int i=1;i<=n;i++) 
	{
		if(a[i]%2==0&&a[i]>0) sum = sum+a[i];
	}

	int x=0;
	int y=-2000000000;
	for(int i=n;i>=1;i--)
	{
		if(a[i]%2==0) continue;
		x=x+a[i];
		if(x%2==0) continue;
		y = max(y,x);
	}

	printf("%d\n",sum+y);

	return 0;
}