Submission #1267207

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267207		gvancak	Fire (BOI24_fire)	C++20	35 / 100	336 ms	47404 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],anss;
map <ll,ll> mx,mp,fix,c;
bool ok,okk;
set <ll> s;
pair <ll,ll> p[N+5],d[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]=-1;
	for (int i=1; i<=n; i++){
		if (c[p[i].s]==-1) c[p[i].s]=p[i].f;
		c[p[i].s]=min(c[p[i].s],p[i].f);
	}
	for (int i=1; i<=n; i++){
		if (fix[p[i].s]==1) continue;
		//pirvelia i
		z=1;
		x=p[i].s; ok=0; b[1]=x; 
		k=1;
		d[k].f=p[i].f; d[k].s=1; ll cr=1;
		okk=0;
		anss=n+1;
		while (fix[x]==0){
			fix[x]=1;
			
			y=mx[x];
			if (y<=x){
				ok=1; break;
			}
			x=y; z++;
			y=c[x];
			k++; d[k].f=y; d[k].s=z;
			
			while (cr<=k && d[cr].f+m<=x+okk*m){
				anss=min(anss,z-d[cr].s+1);
				cr++;
			}
			if (x>m) okk=1,x-=m;
		}
		z=anss;
		if (z>n) continue;
		if (ans==-1) ans=z;
		ans=min(ans,z);
		
		
		}
		
	
		
	
	
	
	cout<<ans<<endl;
	

}

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