hdu 5066 Harry And Physical Teacher(物理题 弹性碰撞)
2015-03-17 23:54
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#include <algorithm> #include <cstring> #include <cstdio> #include <iostream> using namespace std; long long v1 , v2; int main ( ) { while ( ~scanf ( "%lld%lld" , &v1 , &v2 ) ) { printf ( "%lld\n" , 2*v1 - v2 ); } }
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