Submission #879682

#	Time	Username	Problem	Language	Result	Execution time	Memory
879682		OAleksa	Sails (IOI07_sails)	C++14	0 / 100	1063 ms	37716 KiB

sails

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define f first
#define s second
const int maxn = 1e6 + 69;
int n, a[maxn], b[maxn];
pair<int, int> st[4 * maxn];
void combine(int v) {
	auto l1 = st[v * 2];
	auto r1 = st[v * 2 + 1];
	if (l1.f < r1.f)
		st[v] = st[v * 2];
	else
		st[v] = st[v * 2 + 1];
}
void build(int v, int l, int r) {
	if (l == r) {
		st[v] = {0, l};
	}
	else {
		int mid = (l + r) / 2;
		build(v * 2, l, mid);
		build(v * 2 + 1, mid + 1, r);
		combine(v);
	}
}
void upd(int v, int tl, int tr, int p) {
	if (tl == tr) {
		st[v].f++;
	}
	else {
		int mid = (tl + tr) / 2;
		if (p <= mid)
			upd(v * 2, tl, mid, p);
		else
			upd(v * 2 + 1, mid + 1, tr, p);
		combine(v);
	}
}
pair<int, int> qry(int v, int tl, int tr, int l, int r) {
	if (tl > r || tr < l)
		return {1e9, -1};
	else if (tl >= l && tr <= r)
		return st[v];
	else {
		int mid = (tl + tr) / 2;
		auto l1 = qry(v * 2, tl, mid, l, r);
		auto r1 = qry(v * 2 + 1, mid + 1, tr, l, r);
		if (l1.f < r1.f)
			return l1;
		else
			return r1;
	}
}
signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
   int tt = 1;
  	//cin >> tt;
   while (tt--) {
   	cin >> n;
   	for (int i = 1;i <= n;i++) 
   		cin >> a[i] >> b[i];
   	build(1, 1, 1e6);
   	int ans = 0;
   	for (int i = 1;i <= n;i++) {
   		while (b[i] > 0) {
   			auto r = qry(1, 1, 1e6, 1, a[i]);
   			ans += r.f;
   			upd(1, 1, 1e6, r.s);
   			b[i]--;
   		}
   	}
   	cout << ans;
	}
	return 0;
}

• 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
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10