Submission #1267201

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267201		gvancak	Fire (BOI24_fire)	C++20	0 / 100	2049 ms	328 KiB

Main

#include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
//#define mp make_pair
#define ll long long
using namespace std;
ll mod=1e9+7;
const ll N=2*1e5;
ll a[N+5],l,r,x,y,z,ans,t,n,q,mn,k,m,b[N+5];
map <ll,ll> mx,mp,fix;
map <ll, pair<ll,ll> > c;
bool ok,okk;
set <ll> s;
pair <ll,ll> p[N+5];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0),cout.tie(0);
    
    cin>>n>>m;
    for (int i=1; i<=n; i++){
    	cin>>p[i].f>>p[i].s;
	}
	sort(p+1,p+n+1);

	for (int i=1; i<=n; i++){
		if (p[i].f>p[i].s) b[0]=max(b[0],p[i].s),p[i].s+=m;
		
	}
	for (int i=1; i<=n; i++){
		b[i]=max(b[i-1],p[i].s);
	}
	
	for (int i=1; i<=n; i++) a[i]=p[i].f;
	for (int i=1; i<=n; i++){
		x=p[i].s;
		if (x>a[n]) y=n;
		else y=upper_bound(a+1,a+n+1,x)-a-1;
		mx[p[i].s]=b[y];
	}
	for (int i=0; i<=n; i++) b[i]=0;
	

	
	
	ans=-1;
	for (int i=1; i<=n; i++) c[p[i].s].f=-1;
	for (int i=1; i<=n; i++){
	
		//pirvelia i
		z=1;
		x=p[i].s; ok=0; b[1]=x; 
		while (x<p[i].f+m){
			if (c[x].f==-1){
			y=mx[x];
			if (y<=x){
				ok=1; break;
			}
			x=y;
			z++;
		
		
		}
		else{
			z+=c[x].s;
			y=c[x].f;
			x=y;	
		}
		
		b[z]=x;
		
		}
		if (ok) continue;
		if (ans==-1) ans=z;
		ans=min(ans,z);
		for (int i=1; i<=z; i++){
			if (b[i]==0) continue;
			y=b[i];
			if (c[p[y].s].f<x) {
				c[p[y].s].f=x; c[p[y].s].s=z-i+1;
			}
			else
			if (c[p[y].s].f==x){
				c[p[y].s].s=min(c[p[y].s].s,z-i+1);
			}
			b[i]=0;
		}
		
	
		
	
	}
	
	cout<<ans<<endl;
	

}

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