Submission #318558

#	Time	Username	Problem	Language	Result	Execution time	Memory
318558		mohamedsobhi777	City (JOI17_city)	C++14	100 / 100	537 ms	46220 KiB

Encoder

#include <bits/stdc++.h>
#include "Encoder.h"

const int MAX = 5e5;
using namespace std;

vector<int> adj[MAX], seq;
long long st[MAX], en[MAX], T;
const int L = 250000 + 1;
const double app = 1.0556451;

void build()
{
        seq.push_back(0);
        for (int i = 0; i < 256; ++i)
        {
                int x = seq.back();
                x = x * app;
                if (x == seq.back())
                        ++x;
                seq.push_back(x);
        }
}

void dfs(int x, int p)
{
        st[x] = ++T;
        for (auto u : adj[x])
        {
                if (u == p)
                        continue;
                dfs(u, x);
        }

        int lo = 0, hi = (int)seq.size(), ans = 0;
        while (lo <= hi)
        {
                int mid = (lo + hi) >> 1;
                if (st[x] + seq[mid] >= T)
                        ans = mid, hi = mid - 1;
                else
                        lo = mid + 1;
        }
        T = st[x] + seq[ans];
        long long a = st[x] - 1, b = ans;
        Code(x, a + (1ll << 20) * b);
}

void Encode(int N, int A[], int B[])
{
        build();
        for (int i = 0; i < N - 1; ++i)
        {
                adj[A[i]].push_back(B[i]);
                adj[B[i]].push_back(A[i]);
        }
        dfs(0, 0);
}

Device

#include <bits/stdc++.h>
#include "Device.h"

using namespace std ; 
vector<int> seq;
const int L = 250000 + 1;
const double app = 1.0556451;

void build()
{
        seq.push_back(0);
        for (int i = 0; i < 256; ++i)
        {
                int x = seq.back();
                x = x * app;
                if (x == seq.back())
                        ++x;
                seq.push_back(x);
        }
}

void InitDevice()
{
        build();
}

void adjust(long long x, long long &a, long long &b)
{
        a = x & ((1 << 20) - 1);
        x /= (1 << 20);
        b = a + seq[x];
}

int Answer(long long S, long long T)
{
        long long s1, t1;
        long long s2, t2;
        adjust(S, s1, t1);
        adjust(T, s2, t2);
        if (s2 >= s1 && t2 <= t1)
                return 1;
        if (s1 >= s2 && t1 <= t2)
                return 0;
        return 2;
}

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