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- #include <iostream>
- using namespace std;
- long A, B, sM1=0, sM2=0;
- int main()
- {
- cin >> A;
- cin >> B;
- for(int i = A; i <= B; i++)
- {
- if (i % 2 == 0)
- {
- sM1+=i;
- }
- if(i % 2 != 0)
- {
- sM1-=i;
- }
- }
- cout << sM1 - sM2;
- }
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