Submission #113406

#	Time	Username	Problem	Language	Result	Execution time	Memory
113406		TadijaSebez	Sails (IOI07_sails)	C++11	40 / 100	1085 ms	1024 KiB

sails

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N=100050;
int sum[N],cnt[N];
ll suf[N];
int main()
{
	int n,h,k,mxh=0;
	scanf("%i",&n);
	for(int i=1;i<=n;i++)
	{
		scanf("%i %i",&h,&k);
		cnt[h]++;
		sum[h-k+1]++;
		sum[h+1]--;
		mxh=max(mxh,h);
	}
	for(int i=1;i<=mxh;i++) sum[i]+=sum[i-1];
	while(1)
	{
		bool ok=0;
		for(int i=mxh-1;i>=1;i--) if(sum[i]<sum[i+1])
		{
			int z=sum[i]+sum[i+1];
			sum[i]=(z+1)/2;
			sum[i+1]=z/2;
			ok=1;
		}
		if(!ok) break;
	}
	ll ans=0;
	for(int i=1;i<=mxh;i++) ans+=(ll)sum[i]*(sum[i]-1)/2;
	/*for(int i=mxh;i>=1;i--) suf[i]=suf[i+1]+(ll)sum[i]*(sum[i]-1)/2;
	ll tmp=0,ans=suf[1];
	for(int i=1;i<=mxh;i++)
	{
		tmp+=sum[i];
		ll all=tmp/i,ost=tmp%i;
		ll now=suf[i+1]+(i-ost)*all*(all-1)/2+ost*all*(all+1)/2;
		ans=min(ans,now);
	}*/

	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&n);
  ~~~~~^~~~~~~~~
sails.cpp:13:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i %i",&h,&k);
   ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10