#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> ladder;
int size, sum = 0;
cin >> size;
ladder.resize(size);
for (int i = 0; i < size; ++i) {
cin >> ladder[i];
}
for (int i = 0; i < size; ++i) {
if (i + 1 < size && ladder[i] < 0) { // ladder[i] + ladder[i+1] < ladder[i + 1]
sum += ladder[i + 1];
++i;
}
else {
sum += ladder[i];
}
}
cout << sum;
}
#include<cstdlib>
#include<ctime>
#define abs(x) ((x)<0 ? -(x) : (x))
using namespace std;
int main()
{
srand(time(0));
int n, k, m = 0;
cout << "n = ", cin >> n;
int A[n], B[n];
cout <<"A("<<n<<"):";
for(int i = 0; i < n; i++)
cout <<" "<< (A[i] = rand() % (n*2+1) -n);
cout << "\nk = ", cin >> k;
for(int i = 0; i < n; i++)
if (abs(A[i]) % 10 == k) B[m++] = A[i];
cout <<"B("<<m<<"):";
for(int i = 0; i < m; i++)
cout <<" "<< B[i];
return 0;
}