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- #include <iostream>
- #include <vector>
- using namespace std;
- int main()
- {
- int n, x, sum1 = 0, sum2 = 0;
- cin >> n;
- vector<int> a(n);
- for (int i = 0; i < n; i++)
- {
- cin >> a[i];
- }
- for (int i = 0; i < n; i+=2)
- {
- sum1 += a[i];
- }
- for (int i = 1; i < n; i+=2)
- {
- sum2 += a[i];
- }
- cout << sum1 - sum2;
- //system("pause");
- return 0;
- }
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