Submission #919775

#	Time	Username	Problem	Language	Result	Execution time	Memory
919775		penguin133	Sails (IOI07_sails)	C++17	100 / 100	214 ms	17232 KiB

sails

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int n;
pi H[100005];
priority_queue <int, vector <int>, greater <int> > pq;

struct node{
	int s, e, m, val, lz;
	node *l, *r;
	node(int _s, int _e){
		s = _s, e=  _e, m = (s + e) >> 1;
		if(s != e)l = new node(s, m), r = new node(m+1, e);
		val = lz = 0;
	}
	
	void prop(){
		if(lz){
			val += lz * (e - s + 1);
			if(s != e)l->lz += lz, r->lz += lz;
			lz = 0;
		}
	}
	
	void upd(int a, int b, int c){
		if(a == s && b == e)lz += c;
		else{
			if(b <= m)l->upd(a, b, c);
			else if(a > m)r->upd(a, b, c);
			else l->upd(a, m, c), r->upd(m+1, b, c);
			l->prop(), r->prop();
			val = l->val + r->val;
		}
	}
	
	int qry(int a, int b){
		prop();
		if(a == s && b == e)return val;
		if(b <= m)return l->qry(a, b);
		if(a > m)return r->qry(a, b);
		return l->qry(a, m) + r->qry(m+1, b);
	}
}*root;
void solve(){
	cin >> n;
	int ans = 0;
	for(int i = 1; i <= n; i++)cin >> H[i].fi >> H[i].se;
	sort(H + 1, H + n + 1);
	set <int> changing;
	root = new node(0, 100005);
	root->upd(0, 0, 1);
	for(int i = 1; i <= n; i++){
		if(H[i].fi > H[i - 1].fi && root->qry(H[i - 1].fi, H[i - 1].fi))changing.insert(H[i - 1].fi + 1);
		auto it = changing.lower_bound(H[i].fi - H[i].se + 1);
		int tmp = H[i].fi + 1;
		if(it != changing.end()){
			tmp = *it;
			//cerr << tmp << ' ';
			ans += root->qry(tmp, H[i].fi);
			root->upd(tmp, H[i].fi, 1);
		}
		if(it != changing.begin()){
			it--;
			int tmp2 = *it;
			int leftover = H[i].se - (H[i].fi - tmp + 1);
			if(leftover){
				//cerr << tmp2 << ' ' << leftover;
				ans += root->qry(tmp2, tmp2 + leftover - 1);
				root->upd(tmp2, tmp2 + leftover - 1, 1);
				//update the changing points
				if(tmp2 != 1 && root->qry(tmp2, tmp2) == root->qry(tmp2 - 1, tmp2 - 1))changing.erase(tmp2);
				if(tmp2 + leftover != 1 && root->qry(tmp2 + leftover, tmp2 + leftover) < root->qry(tmp2 + leftover - 1, tmp2 + leftover - 1))changing.insert(tmp2 + leftover);
			}
		}
		//cout << '\n';
		if(tmp > 1 && tmp != H[i].fi + 1 && root->qry(tmp, tmp) == root->qry(tmp - 1, tmp - 1))changing.erase(tmp);
	}
	cout << ans;
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

sails.cpp:91:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   91 | main(){
      | ^~~~

• 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