Submission #512474

#	Time	Username	Problem	Language	Result	Execution time	Memory
512474		alextodoran	Saveit (IOI10_saveit)	C++17	0 / 100	255 ms	10588 KiB

encoder

/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

static const int N_MAX = 1000;
static const int H_MAX = 36;

static int N, H, E;

static int dist[H_MAX][N_MAX];

static int parent[N_MAX];

static vector <int> adj[N_MAX];

static vector <int> order;

void dfsRec (int u) {
    order.push_back(u);
    for (int v : adj[u]) {
        if (parent[v] == -1) {
            parent[v] = u;
            dfsRec(v);
        }
    }
}
void dfs (int h) {
    for (int u = 0; u < N; u++) {
        parent[u] = -1;
    }
    parent[h] = h;
    dfsRec(h);
}

#include "grader.h"
#include "encoder.h"

void encode_bit (int bit);

void encode_int (int val, int len) {
    for (int bit = len - 1; bit >= 0; bit--) {
        encode_bit((val >> bit) & 1);
    }
}

void bfs (int h, int dist[]) {
    for (int u = 0; u < N; u++) {
        dist[u] = -1;
    }
    queue <int> q;
    dist[h] = 0;
    q.push(h);
    while (q.empty() == false) {
        int u = q.front();
        q.pop();
        for (int v : adj[u]) {
            if (dist[v] == -1) {
                dist[v] = dist[u] + 1;
                q.push(v);
            }
        }
    }
}

void encode (int nv, int nh, int ne, int *v1, int *v2) {
    N = nv; H = nh; E = ne;
    for (int i = 0; i < E; i++) {
        adj[v1[i]].push_back(v2[i]);
        adj[v2[i]].push_back(v1[i]);
    }
    for (int u = 0; u < N; u++) {
        sort(adj[u].begin(), adj[u].end());
    }

    for (int h = 0; h < H; h++) {
        bfs(h, dist[h]);
    }

    dfs(0);
    for (int u = 0; u < N; u++) {
        adj[u].clear();
    }
    order.clear();
    for (int u = 1; u < N; u++) {
        encode_int(parent[u], 10);
        adj[u].push_back(parent[u]);
        adj[parent[u]].push_back(u);
    }
    for (int u = 0; u < N; u++) {
        sort(adj[u].begin(), adj[u].end());
    }

    for (int h = 0; h < H; h++) {
        dfs(h);
        int x = 0, p = 1;
        for (int i = 1; i < N; i++) {
            int u = order[i];
            int d = 1 + (dist[h][u] - dist[h][parent[u]]);
            x += p * d; p *= 3;
            if (i % 3 == 0 || i == N - 1) {
                encode_int(x, 5);
                x = 0; p = 1;
            }
        }
        order.clear();
    }

    for (int u = 0; u < N; u++) {
        adj[u].clear();
    }
}

decoder

/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

static const int N_MAX = 1000;
static const int H_MAX = 36;

static int N, H, E;

static int dist[H_MAX][N_MAX];

static int parent[N_MAX];

static vector <int> adj[N_MAX];

static vector <int> order;

void dfsRec (int u) {
    order.push_back(u);
    for (int v : adj[u]) {
        if (parent[v] == -1) {
            parent[v] = u;
            dfsRec(v);
        }
    }
}
void dfs (int h) {
    for (int u = 0; u < N; u++) {
        parent[u] = -1;
    }
    parent[h] = h;
    dfsRec(h);
}

#include "grader.h"
#include "decoder.h"

int decode_bit ();

void hops (int a, int b, int d);

int decode_int (int len) {
    int val = 0;
    for (int bit = len - 1; bit >= 0; bit--) {
        val |= (decode_bit() << bit);
    }
    return val;
}

void decode (int nv, int nh) {
    N = nv; H = nh;
    for (int u = 1; u < N; u++) {
        parent[u] = decode_int(10);
        adj[u].push_back(parent[u]);
        adj[parent[u]].push_back(u);
    }
    for (int u = 0; u < N; u++) {
        sort(adj[u].begin(), adj[u].end());
    }

    for (int h = 0; h < H; h++) {
        dfs(h);
        dist[h][h] = 0;
        int x = decode_int(5);
        for (int i = 1; i < N; i++) {
            int u = order[i];
            int d = x % 3 - 1; x /= 3;
            dist[h][u] = dist[h][parent[u]] + d;
            if (i % 3 == 0) {
                x = decode_int(5);
            }
        }
        order.clear();
    }
    for (int h = 0; h < H; h++) {
        for (int u = 0; u < N; u++) {
            hops(h, u, dist[h][u]);
        }
    }

    for (int u = 0; u < N; u++) {
        adj[u].clear();
    }
}

Compilation message (stderr)

decoder.cpp:18:18: warning: 'E' defined but not used [-Wunused-variable]
   18 | static int N, H, E;
      |                  ^

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25