Submission #1141641

#	Time	Username	Problem	Language	Result	Execution time	Memory
1141641		ghammazhassan	Fire (BOI24_fire)	C++20	40 / 100	618 ms	25272 KiB

Main

// #include <bits/stdc++.h>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <map>
#include <vector>
#include <iomanip>
#include <string>
#include <queue>
#include <set>
#include <deque>
using namespace std;
#define int long long
#define endl "\n";
const int N=2e5+5;
const int M=1e9+7;
void solve()
{
	int n,m;
	cin >> n >> m;
	vector<int>l,r;
	vector<pair<int,int>>a;
	int o1=0,o2=1e9;
	for (int i=0;i<n;i++){
		int x,y;
		cin >> x >> y;
		if (x>y){
			y+=m;
		}
		o1=max(o1,y-x);
		o2=min(o2,y-x);
		a.push_back({x,y});
	}
	sort(a.begin(),a.end());
	for (int i=0;i<n;i++){
		int x=a[i].first;
		int y=a[i].second;
		l.push_back(x);
		r.push_back(y);
	}
	for (int i=0;i<2*n;i++){
		l.push_back(l[i]+m);
		r.push_back(r[i]+m);
	}
	if (o1==o2){
		vector<int>ai;
		for (int i=0;i<3*n;i++){
			ai.push_back(l[i]);
		}
		int o=o1;
		int j=0;
		int mi=l[j];
		int mx=r[j];
		int c=1;
		int u1=-1;
		while (mx-mi<m){
			int u=0;
			int y=0;
			int f=0;
			int L=0,H=2*n-1,M=(L+H+1)/2;
			while (L<H){
				if (ai[M]>mx){
					H=M-1;
				}
				else{
					L=M;
				}
				M=(L+H+1)/2;
			}
			if (u1==-1){
				u1=0;
				mi=ai[M];
				mx=mi+o;
				continue;
			}
			if (mx>=ai[M]+o){
				break;
			}
			mx=ai[M]+o;
			c++;
		}
		if (mx-mi>=m){
			cout << c << endl;
		}
		else{
			cout << -1 << endl;
		}
		return;
	}
	int u=0;
	int j=0;
	for (int i=0;i<n;i++){
		if (r[i]-l[i]>u){
			j=i;
			u=r[i]-l[i];
		}
	}
	int mi=l[j];
	int mx=r[j];
	int c=1;
	int u1=-1;
	int u2=-1;
	while (mx-mi<m){
		int u=0;
		int y=0;
		int f=0;
		for (int i=0;i<2*n;i++){
			if (l[i]<=mx and r[i]-mx>u){
				f=i;
				u=r[i]-mx;
			}
			
		}
		if (u1==-1){
			u1=0;
			mi=l[f];
			mx=r[f];
			continue;
		}
		if (u==0){
			break;
		}
		mx+=u;
		c++;
	}
	if (mx-mi>=m){
		cout << c << endl;
	}
	else{
		cout << -1 << endl;
	}
}
signed main()
{

    ios::sync_with_stdio(0);//DO NOT USE IN INTERACTIVE
    cin.tie(0), cout.tie(0);//DO NOT USE IN INTERACTIVE
    cout << fixed<<setprecision(9);
    int t=1;
    // cin >> t;
    for (int _=1;_<=t;_++){
    	solve();
    }
}

• Subtask 1: 14 / 14
• Subtask 2: 17 / 17
• Subtask 3: 9 / 9
• Subtask 4: 0 / 13
• Subtask 5: 0 / 21
• Subtask 6: 0 / 26