Submission #4128

#	Time	Username	Problem	Language	Result	Execution time	Memory
4128		pichulia	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#include<stdio.h>
long long int a,b,c,d;
long long int f(long long int x)
{
	x/=2;
	x=x*(x+1);
	return x>0?x-2:0;
}
int main()
{
	scanf("%lld %lld",&a,&b);
	printf("%lld\n",f(b)-f(a-1));
}

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