Description 求一个给定的圆(x^2+y^2=r^2),在圆周上有多少个点的坐标是整数.Input rOutput 整点个数Sample Input4Sample Output4HINT n<=2000 000 000 不会做,膜拜神犇的题解 var r:int64; ans,d:longint; function gcd(a,b:int64):int64; var t:int64; begin do begin t:=a mod b; a:=b; b:=t; end; exit(a)…