Submission #139534

#	Time	Username	Problem	Language	Result	Execution time	Memory
139534		Boxworld	Sails (IOI07_sails)	C++14	0 / 100	2 ms	380 KiB

sails

#include <bits/stdc++.h>
using namespace std;
const int N=100010;
pair<int,int> a[N];
int s[N],L[N];
int main(){
	int n,tmp=0,MX=0;
	freopen("sails.in.5a","r",stdin);
	scanf("%d",&n);
	for (int i=0;i<n;i++)scanf("%d%d",&a[i].first,&a[i].second);
	sort(a,a+n); 
	for (int i=0;i<n;i++){
		s[0]+=a[i].first-tmp;
		int cnt=a[i].second;
		for (int j=0;j<=MX;j++)
		if (cnt>s[j]){
			L[j+1]=s[j];
			cnt-=s[j];
			s[j]=0;
		}else{
			L[j+1]=cnt;
			s[j]-=cnt;
			cnt=0;
			break;
		}
		if (L[MX+1]>0)MX++;
		for (int j=0;j<=MX;j++)s[j]+=L[j],L[j]=0;
		tmp=a[i].first;
	}
	long long ans=0;
	for (int i=0;i<=n;i++)ans+=(long long)s[i]*i*(i-1)/2;
	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:8:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("sails.in.5a","r",stdin);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sails.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
sails.cpp:10:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i=0;i<n;i++)scanf("%d%d",&a[i].first,&a[i].second);
                       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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