Submission #7817

#	Time	Username	Problem	Language	Result	Execution time	Memory
7817		IohcEjnim	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#include <stdio.h>

long long f(long long x)
{
  if (x < 2) return 0;
  return x*(x+1)-2;
}

int main()
{
  long long a, b;
  scanf("%lld %lld", &a, &b);
  printf("%lld", f(b/2)-f((a-1)/2));
  return 0;
}

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