Submission #7807

#	Time	Username	Problem	Language	Result	Execution time	Memory
7807		jackae98	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

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

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