Submission #978815

#	Time	Username	Problem	Language	Result	Execution time	Memory
978815		MilosMilutinovic	Growing Vegetables is Fun 5 (JOI24_vegetables5)	C++14	4 / 100	5007 ms	204188 KiB

Main

#include<bits/stdc++.h>
 
#define pb push_back
#define fi first
#define se second
#define mp make_pair
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef long double ld;
 
template <typename T> bool chkmin(T &x,T y){return x>y?x=y,1:0;}
template <typename T> bool chkmax(T &x,T y){return x<y?x=y,1:0;}
 
ll readint(){
	ll x=0,f=1; char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
	return x*f;
}

int n,tot;
int a[600005],b[600005],c[600005],s[2200005][2],t[2200005][2],d[2200005][4],xs[2200005],id[600005];
int sum[24000000][4],tag[24000000][2],val[24000000][2];

void pushdown(int id){
	for(int x=0;x<2;x++){
		if(tag[id][x]==0) continue;
		sum[id<<1][x*2]+=tag[id][x];
		sum[id<<1][x*2+1]+=tag[id][x];
		sum[id<<1|1][x*2]+=tag[id][x];
		sum[id<<1|1][x*2+1]+=tag[id][x];
		tag[id<<1][x]+=tag[id][x];
		tag[id<<1|1][x]+=tag[id][x];
		tag[id][x]=0;
	}
}

void build(int id,int l,int r){
	tag[id][0]=0;
	tag[id][1]=0;
	if(l==r){
		val[id][0]=val[id][1]=0;
		sum[id][0]=s[l][0];
		sum[id][1]=t[l][0];
		sum[id][2]=s[l][1];
		sum[id][3]=t[l][1];
		return;
	}
	int mid=(l+r)/2;
	build(id<<1,l,mid);
	build(id<<1|1,mid+1,r);
	for(int x=0;x<2;x++){
		sum[id][x*2]=max(sum[id<<1][x*2],sum[id<<1|1][x*2]);
		sum[id][x*2+1]=min(sum[id<<1][x*2+1],sum[id<<1|1][x*2+1]);
		val[id][x]=max({val[id<<1][x],val[id<<1|1][x],sum[id<<1|1][x*2]-sum[id<<1][x*2+1]});
	}
}

void change(int id,int l,int r,int ql,int qr,int v){
	if(ql<=l&&r<=qr){
		sum[id][0]+=v;
		sum[id][1]+=v;
		sum[id][2]-=v;
		sum[id][3]-=v;
		tag[id][0]+=v;
		tag[id][1]-=v;
		if(l!=r) pushdown(id);
		return;
	}
	pushdown(id);
	int mid=(l+r)/2;
	if(qr<=mid) change(id<<1,l,mid,ql,qr,v);
	else if(ql>mid) change(id<<1|1,mid+1,r,ql,qr,v);
	else change(id<<1,l,mid,ql,qr,v),change(id<<1|1,mid+1,r,ql,qr,v);
	for(int t=0;t<2;t++){
		sum[id][t*2]=max(sum[id<<1][t*2],sum[id<<1|1][t*2]);
		sum[id][t*2+1]=min(sum[id<<1][t*2+1],sum[id<<1|1][t*2+1]);
		val[id][t]=max({val[id<<1][t],val[id<<1|1][t],sum[id<<1|1][t*2]-sum[id<<1][t*2+1]});
	}
}

int lwb(int x){
	int l=0,r=tot-1,p=tot;
	while(l<=r){
		int mid=(l+r)/2;
		if(xs[mid]>=x) p=mid,r=mid-1;
		else l=mid+1;
	}
	return p;
}

bool check(int x){
	{
		int ptr=0;
		for(int i=1;i<=n;i++){
			while(ptr+1<tot&&xs[ptr+1]<b[i]-x) ptr++;
			int idx=(xs[ptr]>=b[i]-x?ptr:ptr+1);
			if(idx<tot) d[idx][0]-=1;
		}
	}
	{
		int ptr=0;
		for(int i=1;i<=n;i++){
			while(ptr+1<tot&&xs[ptr+1]<b[i]+x) ptr++;
			int idx=(xs[ptr]>=b[i]+x?ptr:ptr+1);
			if(idx<tot) d[idx][1]-=1;
		}
	}
	{
		int ptr=0;
		for(int i=1;i<=n;i++){
			while(ptr+1<tot&&xs[ptr+1]<c[i]-x) ptr++;
			int idx=(xs[ptr]>=c[i]-x?ptr:ptr+1);
			if(idx<tot) d[idx][2]-=1;
		}
	}
	{
		int ptr=0;
		for(int i=1;i<=n;i++){
			while(ptr+1<tot&&xs[ptr+1]<c[i]+x) ptr++;
			int idx=(xs[ptr]>=c[i]+x?ptr:ptr+1);
			if(idx<tot) d[idx][3]-=1;
		}
	}
	for(int i=1;i<=n;i++){
		d[id[i]][0]+=1;
		d[id[i]][1]+=1;
		d[id[i+n]][2]+=1;
		d[id[i+n]][3]+=1;
	}
	for(int i=1;i<tot;i++){
		s[i][0]=s[i-1][0]+d[i][0];
		s[i][1]=s[i-1][1]+d[i][2];
		t[i][0]=t[i-1][0]+d[i][1];
		t[i][1]=t[i-1][1]+d[i][3];
		d[i][0]=d[i][1]=d[i][2]=d[i][3]=0;
	}
	build(1,0,tot-1);
	if(val[1][0]<=0&&val[1][1]<=0) return true;
	int fx=val[1][0],fy=val[1][1];
	for(int i=1;i<=n;i++){
		int p=id[i],q=id[i+n],sgn=-1;
		if(p>q) swap(p,q),sgn=1;
		if(p<q) change(1,0,tot-1,p,q-1,sgn);
		if(val[1][0]<=0&&val[1][1]<=0) return true;
		if(val[1][0]>n-i||val[1][1]>n-i) return false;
		//if(val[1][0]>fx||val[1][1]>fy) return false;
		if(val[1][0]==fx&&val[1][1]==fy) return false;
		fx=val[1][0]; fy=val[1][1];
	}
	return false;
}

int solve(int f){
	int l=0,r=f,res=1e9;
	while(l<=r){
		int mid=(l+r)/2;
		if(check(mid)) res=mid,r=mid-1; 
		else l=mid+1;
	}
	return res;
}

int main(){
	n=readint();
	for(int i=1;i<=2*n;i++) a[i]=readint();
	for(int i=1;i<=n;i++) b[i]=readint();
	for(int i=1;i<=n;i++) c[i]=readint();
	tot=0;
	xs[tot++]=-1e9-5;
	for(int i=1;i<=2*n;i++){
		xs[tot++]=a[i];
		xs[tot++]=a[i]-1;
	}
	sort(xs,xs+tot);
	tot=unique(xs,xs+tot)-xs;
	for(int i=1;i<=2*n;i++) id[i]=lwb(a[i]);
	sort(b+1,b+n+1);
	sort(c+1,c+n+1);
	int ans=solve((int)1e9);
	for(int i=1;i<=n;i++) swap(b[i],c[i]);
	ans=min(ans,solve(ans));
	printf("%d\n",ans);
	return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 37
• Subtask 5: 0 / 33