摘要：
已经知道三角形三点A(X1,Y1) B(X2,Y2) C(X3,Y3) $$ \vec{AB} = (X2 X1,Y2 Y1) $$ $$ \vec{AC} = (X3 X1,Y3 Y1) $$ $$ ||n|| = \vec{AB} \times \vec{AC} = |\vec{AB}|\cdo 阅读全文
摘要：
Language:DefaultSequence Time Limit: 5000MSMemory Limit: 65536KTotal Submissions: 9000Accepted: 2036Case Time Limit: 2000MSDescriptionGiven a sequence 阅读全文