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- #include <iostream>
- #include <vector>
- using namespace std;
- int main() {
- int n;
- cin >> n;
- int prethoden_element = -1;
- int prv = 0;
- long long sum = 0;
- for(int i = 0; i < n; i++) {
- int x;
- cin >> x;
- if(prethoden_element == -1) {
- prethoden_element = x;
- prv = x;
- }
- else {
- if(prethoden_element + 1 != x) {
- sum += prv;
- prv = x;
- }
- }
- prethoden_element = x;
- }
- cout << sum + prv << endl;
- return 0;
- }
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