Submission #2915

#	Time	Username	Problem	Language	Result	Execution time	Memory
2915		alephnull	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1096 KiB

polygon

#include <cstdio>
#include <algorithm>
using namespace std;
int p[2000];
typedef long long ll;
ll s(ll n){
	if(n&1)return s(n-1);
	return (n/2)*(n/2+1);
}
int main() {
	ll a,b;scanf("%lld %lld",&a,&b);
	printf("%lld",a<=2&&2<=b?s(b)-s(a-1)-2:s(b)-s(a-1));
}

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