Submission #917428

#	Time	Username	Problem	Language	Result	Execution time	Memory
917428		PM1	MP3 Player (CEOI10_mp3player)	C++17	20 / 100	83 ms	12748 KiB

mp3player

#include <bits/stdc++.h>
using namespace std;
#define fr first
#define sc second
const int mxn=1e5+5,sz=(1<<20);
int n,vmx,v2,t[mxn],a[mxn];
vector<pair<int,int>>v;
struct segment{
	int mx[sz],mn[sz],lazy[sz];
	void shift(int id){
		for(int i=0;i<2;i++){
			mx[id*2+i]+=lazy[id];
			mn[id*2+i]+=lazy[id];
			lazy[id*2+i]+=lazy[id];
		}
		lazy[id]=0;
	}
	void add(int id,int L,int R,int l,int r,int x){
		if(L==l && R==r){
			lazy[id]+=x;
			mx[id]+=x;
			mn[id]+=x;
			return ;
		}
		if(lazy[id])
			shift(id);
		int mid=(L+R)/2;
		if(l<mid)
			add(id*2,L,mid,l,min(r,mid),x);
		if(r>mid)
			add(id*2+1,mid,R,max(l,mid),r,x);
		mx[id]=max(mx[id*2],mx[id*2+1]);
		mn[id]=min(mn[id*2],mn[id*2+1]);
	}
}seg;
int main(){
	cin>>n>>vmx>>v2;
	for(int i=1;i<=n;i++){
		char x;
		cin>>x>>t[i];
		if(x=='+')a[i]=1;
		else a[i]=-1;
		if(i!=1)seg.add(1,1,n+2,1,i+1,-a[i]);
	}
	seg.add(1,1,n+2,1,n+2,v2);
	for(int i=n;i>1;i--){
		t[i]-=t[i-1];
		v.push_back({t[i],i});
	}
	v.push_back({0,0});
	sort(v.begin(),v.end());
	int p=v.back().fr;
	while(v.size()){//cout<<seg.mx[1]<<" "<<seg.mn[1]<<endl;
		if(seg.mx[1]<=vmx && seg.mn[1]>=0)break;
		while(v.back().fr==p){
			seg.add(1,1,n+2,1,v.back().sc+1,a[v.back().sc]);
			v.pop_back();
		}
		p=v.back().fr;
	}
	cout<<v.back().fr<<" ";
	int l=0,r=vmx+1,y=v.back().fr;
	while(r-l>1){
		int mid=(l+r)/2,x=mid;
		for(int i=2;i<=n;i++){
			if(y>=t[i]){
				x+=a[i];
				x=max(0,x);
				x=min(x,vmx);
			}
		}
		if(x<=v2)l=mid;
		else r=mid;
	}
	cout<<l;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10