Submission #1061511

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061511		thieunguyenhuy	Saveit (IOI10_saveit)	C++17	0 / 100	139 ms	19108 KiB

encoder

#ifndef hwe
	#include "grader.h"
#endif

#include <bits/stdc++.h>
using namespace std;

#define popcount(n) (__builtin_popcountll((n)))
#define clz(n) (__builtin_clzll((n)))
#define ctz(n) (__builtin_ctzll((n)))
#define lg(n) (63 - __builtin_clzll((n)))
#define BIT(n, i) (((n) >> (i)) & 1ll)
#define MASK(i) (1ll << (i))
#define FLIP(n, i) ((n) ^ (1ll << (i)))
#define ON(n, i) ((n) | MASK(i))
#define OFF(n, i) ((n) & ~MASK(i))

#define Int __int128
#define fi first
#define se second

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef vector<pair<int, int>> vii;
typedef vector<pair<long long, long long>> vll;
typedef vector<pair<long long, int>> vli;
typedef vector<pair<int, long long>> vil;

template <class T1, class T2>
bool maximize(T1 &x, T2 y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <class T1, class T2>
bool minimize(T1 &x, T2 y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

template <class T>
void remove_duplicate(vector<T> &ve) {
    sort (ve.begin(), ve.end());
    ve.resize(unique(ve.begin(), ve.end()) - ve.begin());
}

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
template <class T> T random(T l, T r) {
    return uniform_int_distribution<T>(l, r)(rng);
}
template <class T> T random(T r) {
    return rng() % r;
}

const int N = 1000, H = 36;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll INF = 1e18;

int dist[H][N], par[N];
vector<int> adj[N];

#ifdef hwe
void encode_bit(int bit) {
	cerr << bit;
}
#endif

void bfs(int root) {
	memset(dist[root], 0x3f, sizeof dist[root]);
	queue<int> q; q.emplace(root); dist[root][root] = 0;
	while (!q.empty()) {
		int u = q.front(); q.pop();
		for (auto v : adj[u]) if (minimize(dist[root][v], dist[root][u] + 1)) {
			q.emplace(v);
			if (root == 0) par[v] = u;
		}
	}
}

void encode(int n, int h, int m, int *a, int *b) {
	for (int i = 0; i < n; ++i) {
		adj[i].clear(), par[i] = -1;
	}
	int LOG = lg(n) + 1;

	for (int i = 0; i < m; ++i) {
		int u = a[i], v = b[i];
		adj[u].emplace_back(v), adj[v].emplace_back(u);
	}

	for (int i = 0; i < h; ++i) bfs(i);

	// send the spanning tree by the parent of each node in the tree
	for (int i = 1; i < n; ++i)  for (int j = LOG - 1; j >= 0; --j) {
		encode_bit(BIT(par[i], j));
	}
	// cerr << "Done tree\n";

	for (int hub = 0; hub < h; ++hub) {
		for (int i = 1; i < n; i += 3) {
			int num = 0, cnt = 0;
			for (int j = i; j < min(i + 3, n); ++j) {
				int send = dist[hub][j] - dist[hub][par[j]] + 1;
				num = num * 3 + send, ++cnt;
			}
			while (cnt < 3) num = num * 3, ++cnt;
			for (int j = 4; j >= 0; --j) encode_bit(BIT(num, j));
		}
	}
}

#ifdef hwe
signed main() {
	int n = 3, h = 1, m = 2;
	int a[m], b[m];
	a[0] = 0, b[0] = 1;
	a[1] = 0, b[1] = 2;

	encode(n, h, m, a, b);

    cerr << '\n'; return 0;
}
#endif

decoder

#ifndef hwe
	#include "grader.h"
#endif

#include <bits/stdc++.h>
using namespace std;

#define popcount(n) (__builtin_popcountll((n)))
#define clz(n) (__builtin_clzll((n)))
#define ctz(n) (__builtin_ctzll((n)))
#define lg(n) (63 - __builtin_clzll((n)))
#define BIT(n, i) (((n) >> (i)) & 1ll)
#define MASK(i) (1ll << (i))
#define FLIP(n, i) ((n) ^ (1ll << (i)))
#define ON(n, i) ((n) | MASK(i))
#define OFF(n, i) ((n) & ~MASK(i))

#define Int __int128
#define fi first
#define se second

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef vector<pair<int, int>> vii;
typedef vector<pair<long long, long long>> vll;
typedef vector<pair<long long, int>> vli;
typedef vector<pair<int, long long>> vil;

template <class T1, class T2>
bool maximize(T1 &x, T2 y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <class T1, class T2>
bool minimize(T1 &x, T2 y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

template <class T>
void remove_duplicate(vector<T> &ve) {
    sort (ve.begin(), ve.end());
    ve.resize(unique(ve.begin(), ve.end()) - ve.begin());
}

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
template <class T> T random(T l, T r) {
    return uniform_int_distribution<T>(l, r)(rng);
}
template <class T> T random(T r) {
    return rng() % r;
}

const int N = 1000, H = 36;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll INF = 1e18;

int dep[N], par[N], dif[N], dist[N];
vector<int> adj[N];
string encoding;
int pos = 0;

#ifdef hwe
int decode_bit() {
	// cerr << pos << ' ' << encoding[pos] << '\n';
	return encoding[pos++] - 48;
}

void hops(int u, int v, int d) {
	cerr << "Dist " << u << ' ' << v << ' ' << d << '\n';
}
#endif

void decode(int n, int h) {
	for (int i = 0; i < n; ++i) {
		adj[i].clear(), dep[i] = -1, par[i] = 0;
	}
	int LOG = lg(n) + 1;
	// cerr << LOG << '\n';

	for (int i = 1; i < n; ++i) {
		par[i] = 0;
		for (int j = LOG - 1; j >= 0; --j) par[i] = par[i] << 1 | decode_bit();
		// cerr << "Par " << i << ' ' << par[i] << '\n';
		adj[par[i]].emplace_back(i);
	}

	queue<int> q; q.emplace(0); dep[0] = 0;
	while (!q.empty()) {
		int u = q.front(); q.pop();
		for (auto v : adj[u]) if (dep[v] == -1) {
			dep[v] = dep[u] + 1;
			q.emplace(v);
		}
	}

	vector<int> order(n - 1); iota(order.begin(), order.end(), 1);
	sort (order.begin(), order.end(), [&](int x, int y) {
		return dep[x] < dep[y];
	});

	for (int hub = 0; hub < h; ++hub) {
		memset(dist, -1, sizeof dist);
		dist[hub] = 0;
		
		for (int i = 1; i < n; i += 3) {
			int num = 0;
			for (int j = 4; j >= 0; --j) num = num << 1 | decode_bit();
			// cerr << "Num: " << num << '\n';
			vector<int> sends;
			while (num > 0) sends.emplace_back(num % 3), num /= 3;
			reverse(sends.begin(), sends.end());
			// cerr << "Send: ";
			// for (auto &x : sends) cerr << x << ' ';
			// cerr << '\n';
			for (int j = i; j < min(i + 3, n); ++j) dif[j] = sends[j - i] - 1;
		}

		int u = hub;
		while (u != 0) {
			dist[par[u]] = dist[u] - dif[u];
			u = par[u];
		}

		assert(dist[0] != -1);

		for (auto u : order) {
			if (dist[u] != -1) continue;
			dist[u] = dist[par[u]] + dif[u];
		}

		for (int i = 0; i < n; ++i) hops(hub, i, dist[i]);
	}
}

#ifdef hwe
signed main() {
	cin >> encoding; pos = 0;
	cerr << encoding << '\n';
	decode(3, 1);

    cerr << '\n'; return 0;
}
#endif

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