Submission #347384

#	Time	Username	Problem	Language	Result	Execution time	Memory
347384		Keshi	Sails (IOI07_sails)	C++17	100 / 100	245 ms	32108 KiB

sails

//In the name of God
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

const ll maxn = 2e5 + 100;
const ll mod = 1e9 + 7;
const ll inf = 1e18;

#define fast_io ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io freopen("input.txt", "r+", stdin);freopen("output.txt", "w+", stdout);
#define pb push_back
#define Mp make_pair
#define F first
#define S second
#define Sz(x) ll((x).size())
#define all(x) (x).begin(), (x).end()
#define lc (id << 1)
#define rc (lc | 1)

struct node{
	ll al, ar, sl, sr;
	node(){
		al = ar = sl = sr = 0;
	}
};

ll n, lz[maxn << 2], b[maxn];
pll a[maxn];
node seg[maxn << 2];

void bld(ll id, ll s, ll e){
	seg[id].sl = e;
	seg[id].sr = s;
	if(e - s == 1) return;
	ll mid = (s + e) >> 1;
	bld(lc, s, mid);
	bld(rc, mid, e);
	return;
}

void Do(ll id, ll x){
	seg[id].al += x;
	seg[id].ar += x;
	lz[id] += x;
}

pll get(ll id, ll s, ll e, ll x){
	if(e - s == 1){ 
		return Mp(s, e);
	}
	ll mid = (s + e) >> 1;
	Do(lc, lz[id]);
	Do(rc, lz[id]);
	lz[id] = 0;
	if(x < mid){
		pll p = get(lc, s, mid, x);
		if(p.S == mid && seg[lc].ar == seg[rc].al){
			p.S = seg[rc].sl;
		}
		return p;
	}
	pll p = get(rc, mid, e, x);
	if(p.F == mid && seg[lc].ar == seg[rc].al){
		p.F = seg[lc].sr;
	}
	return p;
}

void upd(ll id, ll s, ll e, ll l, ll r, ll x){
	if(r <= s || e <= l) return;
	if(l <= s && e <= r){
		Do(id, x);
		return;
	}
	ll mid = (s + e) >> 1;
	Do(lc, lz[id]);
	Do(rc, lz[id]);
	lz[id] = 0;
	upd(lc, s, mid, l, r, x);
	upd(rc, mid, e, l, r, x);
	seg[id].al = seg[lc].al;
	seg[id].sl = seg[lc].sl;
	seg[id].ar = seg[rc].ar;
	seg[id].sr = seg[rc].sr;
	if(seg[lc].ar == seg[rc].al){
		if(seg[id].sl == mid) seg[id].sl = seg[rc].sl;
		if(seg[id].sr == mid) seg[id].sr = seg[lc].sr;
	}
	return;
}

ll cal(ll id, ll s, ll e){
	if(e - s == 1){
		return seg[id].al * (seg[id].al - 1) / 2;
	}
	ll mid = (s + e) >> 1;
	Do(lc, lz[id]);
	Do(rc, lz[id]);
	lz[id] = 0;
	return cal(lc, s, mid) + cal(rc, mid, e);
}

int main(){
    fast_io;

	bld(1, 0, maxn);

	cin >> n;
	for(ll i = 0; i < n; i++){
		cin >> a[i].F >> a[i].S;
	}
	sort(a, a + n);
	for(ll i = 0; i < n; i++){
		pll p = get(1, 0, maxn, a[i].F - a[i].S);
		p.S = min(p.S, a[i].F);
		upd(1, 0, maxn, p.S, a[i].F, 1);
		upd(1, 0, maxn, p.F, p.F + (a[i].S + p.S - a[i].F), 1);
	}
	cout << cal(1, 0, maxn);

    return 0;
}

• 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