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- #include <iostream>
- using namespace std;
- int v1,v2,n,y=0;
- int sr[n];
- int main()
- {
- cin >> n;
- for (int i=0;i<n;i++)
- {
- cin >> v1>>v2;
- sr[y]=(2*v1*v2)/(v1+v2);
- y++;
- }
- y=0;
- for(int i=0;i<n;i++)
- {
- cout<<sr[y]<<endl;
- y++;
- }
- return 0;
- }
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