poj 2181 Jumping Cows

#include <iostream>#include <cstdlib>#include <cstring>#include <cstdio>using namespace std;int n, even, odd;int main(){    scanf("%d", &n);    if (n == 1)    {        int a;        scanf("%d", &a);        printf("%dn", a);        return 0;    }    scanf("%d%d", &odd, &even);    int a, temp;    temp = even;    even = odd - even;    odd = max(temp, odd);    for (int i = 2; i < n; i++)    {        scanf("%d", &a);        temp = max(odd, even + a);        even = max(even, odd - a);        odd = temp;    }    printf("%dn", max(even, odd));    return 0;}