Submission #7784

#	Time	Username	Problem	Language	Result	Execution time	Memory
7784		gs13023	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#include<cstdio>
long long f(int n)
{
  if(n<4)return 2;
  long long t=n/2;
  return t*(t+1);
}
int main()
{
  int a,b;
  scanf("%d%d",&a,&b);
  printf("%lld",f(b)-f(a-1));
}

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