Submission #130650

#	Time	Username	Problem	Language	Result	Execution time	Memory
130650		RezwanArefin01	City (JOI17_city)	C++17	8 / 100	204 ms	19184 KiB

Encoder

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

using namespace std; 

const int N = 2e5 + 5;
vector<int> a, adj[N];
int in[N], idx; 

void build() {
    double r = pow(2.0, 20.0 / 256.0); 
    a.push_back(1);
    while(a.size() < 256) {
        int x = a.back() * r; 
        if(x == a.back()) ++x; 
        a.push_back(x); 
    } 
}

void dfs(int u, int p) {
    in[u] = idx++;
    for(int v : adj[u]) if(v - p) dfs(v, u); 
    int t = lower_bound(a.begin(), a.end(), idx - in[u]) - a.begin(); 
    idx = in[u] + a[t];; 
    Code(u, ((long long)in[u] << 8) | t);
}   

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, -1);
}

Device

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

using namespace std; 

vector<int> seq;
void InitDevice() {
    double r = pow(2, 20.0 / 256.0); 
    seq.push_back(1);
    while(seq.size() < 256) {
        int x = seq.back() * r; 
        if(x == seq.back()) ++x; 
        seq.push_back(x); 
    } 
}

int cnt = 0;
int Answer(long long S, long long T) {
    int inu = S >> 8, szu = seq[S & 255];
    int inv = T >> 8, szv = seq[T & 255]; 

    if(inv <= inu && inu < inv + szv) return 0;
    if(inu <= inv && inv < inu + szu) return 1; 
    return 2; 
}

• Subtask 1: 8 / 8
• Subtask 2: 0 / 92