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#include <iostream> using namespace std; // calc(): returns sum(a[0], a[2], a[4], ...) - sum(a[1], a[3], a[5], ...) int calc(int *a, int size) { int sum_even_pos = 0; int sum_odd_pos = 0; for (int i = 0; i < size; i++) { sum_even_pos += a[i]; if (++i < size) sum_odd_pos += a[i]; } return sum_even_pos - sum_odd_pos; } int main( ) { int a[6]={1,2,3,5,6,2}; int size = 6; cout<< calc(a, size)<<endl; return 0; }
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