Submission #2864

#	Time	Username	Problem	Language	Result	Execution time	Memory
2864		ladown21	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#include <stdio.h>

int main()
{
	long long a, b;
	scanf("%lld%lld",&a,&b);
	a--;
	if (a<3) a=3;
	if (b<a) b=a;
	if (a&1) a--;
	if (b&1) b--;

	a/=2, b/=2;
	printf("%lld\n",((b*(b+1)/2)-(a*(a+1)/2))*2);
}

• Subtask 1: 60 / 60
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30