Submission #99344

#	Time	Username	Problem	Language	Result	Execution time	Memory
99344		TadijaSebez	City (JOI17_city)	C++11	100 / 100	399 ms	35336 KiB

Encoder

#include "Encoder.h"
#define ll long long
const int N=250050*2;
const int M=2*N;
int fir[N],go[M],tot,f[M];
void Add(int u, int v){ tot++;f[tot]=v;go[tot]=fir[u];fir[u]=tot;}
void AddEdge(int u, int v){ Add(u,v);Add(v,u);}
int lid[N],rid[N],tid;
void DFS(int u, int p)
{
	lid[u]=tid++;
	for(int i=fir[u];i;i=go[i]) if(f[i]!=p) DFS(f[i],u);
	double cur=1.0,w=1.05;
	int ans=0;
	while((int)cur<tid-lid[u]) cur*=w,ans++;
	tid=lid[u]+(int)cur;
	Code(u,(ll)ans*N+lid[u]);
}
void Encode(int n, int a[], int b[])
{
	for(int i=0;i<n-1;i++) AddEdge(a[i],b[i]);
	DFS(0,-1);
}

Device

#include "Device.h"
const int N=250050*2;
double ans[2050];
void InitDevice()
{
	ans[0]=1.0;
	for(int i=1;i<2050;i++) ans[i]=ans[i-1]*1.05;
}

int Answer(long long S, long long T)
{
	int x=S/N,l=S%N,r=l+(int)ans[x]-1;
	int y=T/N,L=T%N,R=L+(int)ans[y]-1;
	if(l<=L && R<=r) return 1;
	if(L<=l && r<=R) return 0;
	return 2;
}

• Subtask 1: 8 / 8
• Subtask 2: 92 / 92