Submission #2857

#	Time	Username	Problem	Language	Result	Execution time	Memory
2857		naver1	다각형 (GA5_polygon)	C++98	60 / 100	0 ms	1088 KiB

polygon

#include <stdio.h>

using namespace std;

int main()
{
    int i,j;
    int a,b;
    long long ans=0;
    scanf("%d%d",&a,&b);
    int k;
    int s,l;
    if((b-a+1)%2==0) {
        k=(b-a+1)/2;
        if(a%2==0) {
            s=a;
            l=b-1;
        } else {
            s=a+1;
            l=b;
        }
    } else {
        if(a%2==0) {
            k=(b-a+1)/2+1;
            s=a;
            l=b;
        } else {
            k=(b-a+1)/2;
            s=a+1;
            l=b-1;
        }
    }
    ans=(s+l)*k/2;
    if(a<3 && b>1) ans-=2;
    printf("%lld",ans);
    return 0;
}

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