Codeforces div3 Middle of the Contest (模擬)

Polycarp is going to participate in the contest. It starts at h 1 : m 1 h1:m1 and ends at h 2 : m 2 h2:m2 . It is guaranteed that the contest lasts an even number of minutes (i.e. m 1 %2= m 2 %2 m1%2=
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