The perimeter is the distance around the outside of a 2D shape. The distance can be measured in units like millimetres, centimetres, metres and kilometres. To work out the perimeter, add up the ...

State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Mechanical Engineering, Guangxi University, Nanning 530004, China Institute of Laser ...

#define fast_io ios_base::sync_with_stdio(false);cin.tie(NULL) ...