Submission #2879

#	Time	Username	Problem	Language	Result	Execution time	Memory
2879		cki86201	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#include<stdio.h>

long long int sum(int x)
{
	if(x<2)return 0;
	x/=2;
	long long int ret=x;
	return ret*(ret+1)-2;
}

int main()
{
	int a,b;scanf("%d%d",&a,&b);
	printf("%lld",sum(b)-sum(a-1));
	return 0;
}

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