Submission #7422

#	Time	Username	Problem	Language	Result	Execution time	Memory
7422		gs13068	전봇대 (KOI13_pole)	C++98	100 / 100	32 ms	1476 KiB

pole

#include<cstdio>
#include<algorithm>

int a[100000],n;

long long calc(int x)
{
  int i;
  long long r=0;
  for(i=0;i<n;i++)r+=std::abs(a[i]-a[0]-1LL*i*x);
  return r;
}

int main()
{
  int l,r,mid;
  int i;
  scanf("%d",&n);
  for(i=0;i<n;i++)scanf("%d",&a[i]);
  l=1;r=1000000000;
  while(l<r)
  {
    mid=(l+r)/2;
    if(calc(mid)<calc(mid+1))r=mid;
    else l=mid+1;
  }
  printf("%lld",calc(l));
}

• Subtask 1: 11 / 11
• Subtask 2: 21 / 21
• Subtask 3: 31 / 31
• Subtask 4: 37 / 37