Submission #121871

#	Time	Username	Problem	Language	Result	Execution time	Memory
121871		turbat	Sails (IOI07_sails)	C++14	100 / 100	325 ms	3200 KiB

sails

#include <bits/stdc++.h>
using namespace std;
#define N 100005
 
int n, mh;
long long  sum, cnt[N], s[N], ans, p, uld, avr;
pair <int, int> mast[N];
 
inline void solve (int l){
	if (l > mh) return;
	p = l;
	long long th = mh;
	while (!cnt[p]) p++;
	for (int i = p + 1;i <= th;i++){
		if((s[i] - s[l - 1]) * (p - l + 1) >= (s[p] - s[l - 1]) * (i - l + 1)){
			p = i;
		}
		long long nw = l - 1 + ((s[th] - s[l - 1]) * (i - l + 1)) / (s[i] - s[l - 1]);		
		th = min(th, nw);
		if ((s[th] - s[l - 1]) * (p - l + 1) <= (s[p] - s[l - 1]) * (i - l + 2))
			break;
	}	
	sum = s[p] - s[l - 1];
	avr = sum / (p - l + 1);
	uld = sum % (p - l + 1);
	ans += uld * avr;
	ans += (p - l + 1) * avr * (avr - 1) / 2;
	solve (p + 1);
}
 
int main (){
	ios_base::sync_with_stdio(NULL);
	cin.tie(NULL);
	cin >> n;
	for (int i = 0;i < n;i++){
		cin >> mast[i].first>> mast[i].second;
		mh = max(mh, mast[i].first);
		cnt[mast[i].first + 1]--;
		cnt[mast[i].first - mast[i].second + 1]++;
	}
	for (int i = 1;i <= mh;i++) { 
		cnt[i] += cnt[i - 1];
		s[i] = s[i - 1] + cnt[i];
	}
	solve (1);
	cout << ans;
}

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