Submission #7797

#	Time	Username	Problem	Language	Result	Execution time	Memory
7797		jackae98	다각형 (GA5_polygon)	C++98	60 / 100	0 ms	1088 KiB

polygon

#include <stdio.h>
int a,b;
long long int f(int a){
	return (a*(a+1)/2);
}
int main(){
	scanf("%d %d",&a,&b);
	long long int ans = (f(b/2)-f((a-1)/2))*2;
	if(a<=2 && b>=2) ans-=2;
	printf("%lld",ans);
}

• Subtask 1: 60 / 60
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30