Submission #35359

#	Time	Username	Problem	Language	Result	Execution time	Memory
35359		UncleGrandpa925	Factories (JOI14_factories)	C++14	100 / 100	5803 ms	303928 KiB

factories

#ifndef UncleGrandpa
#include "factories.h"
#endif

#include <bits/stdc++.h>
using namespace std;
#define sp ' '
#define endl '\n'
#define fi first
#define se second
#define mp make_pair
#define bit(x,y) ((x>>y)&1LL)
#define N 500005
ostream& operator << (ostream &os, vector<int>&x) {
	for (int i = 0; i < x.size(); i++) os << x[i] << sp;
	return os;
}
ostream& operator << (ostream &os, pair<int, int> x) {
	cout << x.fi << sp << x.se << sp;
	return os;
}
ostream& operator << (ostream &os, vector<pair<int, int> >&x) {
	for (int i = 0; i < x.size(); i++) os << x[i] << endl;
	return os;
}
#define ll long long
vector<vector<pair<int, int> > > a(N);
ll n;

ll dis[N];
int Time = 0;
int depth[N];
pair<int, int> tour[2 * N], rmq[2 * N][22];
int par[N], sta[N], en[N];
int lg2[2 * N];

void dfs(int u, int p) {
	tour[++Time] = make_pair(depth[u], u); sta[u] = Time;
	par[u] = p;
	for (int i = 0; i < a[u].size(); i++)  {
		int v = a[u][i].fi; int w = a[u][i].se;
		if (v == p) continue;
		depth[v] = depth[u] + 1, dis[v] = dis[u] + w; dfs(v, u);
	}
	tour[++Time] = make_pair(depth[u], u); en[u] = Time;
}

void build_rmq() {
	for (int i = 1; i <= Time; ++i)
		rmq[i][0] = tour[i];
	for (int j = 1; (1 << j) <= Time; ++j)
		for (int i = 1; i + (1 << j) - 1 <= Time; ++i)
			rmq[i][j] = min(rmq[i][j - 1], rmq[i + (1 << (j - 1))][j - 1]);
}

void makelca() {
	dfs(1, 1);
	build_rmq();
}

int lca(int u, int v) {
	if (sta[v] < sta[u]) swap(u, v);
	if (en[u] >= en[v]) return u;
	int dist = lg2[sta[v] - en[u] + 1];
	pair<int, int> ans = min(rmq[en[u]][dist], rmq[sta[v] - (1 << dist) + 1][dist]);
	return par[ans.second];
}

ll lcadis(int u, int v) {
	return abs(dis[u] - dis[v]);
}

ll distance(int u, int v) {
	int p = lca(u, v);
	return dis[u] - dis[p] + dis[v] - dis[p];
}


void Init(int _N, int _A[], int _B[], int _D[]) {
	n = _N;
	for (int i = 1; i <= 2 * N - 5; i++)lg2[i] = log2(i);
	for (int i = 0; i < n; i++) {
		int u = _A[i]; int v = _B[i]; int c = _D[i];
		u++; v++;
		a[u].push_back(mp(v, c));
		a[v].push_back(mp(u, c));
	}
	makelca();
}

vector < vector<pair<int, ll> > > b(N);
vector<int> allVertex;
stack<int> st;
bool byEuler(int u, int v) {
	return sta[u] < sta[v];
}

void makeEdge() {
	sort(allVertex.begin(), allVertex.end(), byEuler);
	int sz = allVertex.size();
	for (int i = 1; i < sz; i++) {
		int u = allVertex[i - 1];
		int v = allVertex[i];
		int p = lca(u, v);
		allVertex.push_back(p);
	}
	sort(allVertex.begin(), allVertex.end(), byEuler);
	allVertex.resize(distance(allVertex.begin(), unique(allVertex.begin(), allVertex.end())));
	while (!st.empty()) st.pop();
	for (int i = 0; i < allVertex.size(); i++) {
		int u = allVertex[i];
		while (!st.empty() && en[st.top()] < sta[u]) st.pop();
		if (st.empty()) {
			st.push(u); continue;
		}
		if (st.top() == u) continue;
		b[st.top()].push_back(mp(u, lcadis(st.top(), u)));
		b[u].push_back(mp(st.top(), lcadis(st.top(), u)));
		st.push(u);
	}
}

bool mark[N];
ll dist[N];

priority_queue<pair<ll, ll> , vector<pair<ll, ll> >, greater<pair<ll, ll> > > pq;
ll Query(int S, int X[], int T, int Y[]) {
	while (!pq.empty()) pq.pop(); allVertex.clear();
	for (ll i = 0; i < S; i++) X[i]++, allVertex.push_back(X[i]);
	for (ll i = 0; i < T; i++) Y[i]++, allVertex.push_back(Y[i]);
	makeEdge();
	for (auto u : allVertex) dist[u] = 1e18;
	for (ll i = 0; i < S; i++) pq.push(mp(0, X[i])), dist[X[i]] = 0;
	for (ll i = 0; i < T; i++) mark[Y[i]] = true;
	ll ret = 1e18;
	while (!pq.empty()) {
		ll u = pq.top().se; ll d = pq.top().fi; pq.pop();
		if (d != dist[u]) continue;
		if (mark[u]) {
			ret = d; break;
		}
		for (ll i = 0; i < b[u].size(); i++) {
			ll v = b[u][i].fi; ll w = b[u][i].se;
			if (dist[v] > dist[u] + w) {
				dist[v] = dist[u] + w;
				pq.push(mp(dist[v], v));
			}
		}
	}
	for (ll i = 0; i < T; i++) mark[Y[i]] = false;
	for (auto u : allVertex) b[u].clear();
	return ret;
}


#ifdef UncleGrandpa
#define MAX_N          500000
#define MAX_Q          100000
#define MAX_SUM_ST    1000000
#define MAX_VALUE  1000000000

static int _N, _Q;
static int _A[MAX_N], _B[MAX_N], _D[MAX_N];
static int _S[MAX_N];
static int _T[MAX_N];
static int _X[MAX_SUM_ST];
static int _Y[MAX_SUM_ST];

static int _Qx[MAX_N];
static int _Qy[MAX_N];
#endif

#ifdef UncleGrandpa
int main() {
#ifdef in1code
	freopen("1test.inp", "r", stdin);
#endif
	int i, j, k;
	int STop, TTop;

	if (2 != scanf("%d%d", &_N, &_Q)) {
		fprintf(stderr, "error: cannot read _N and _Q.\n");
		exit(1);
	}
	if (!(2 <= _N && _N <= MAX_N)) {
		fprintf(stderr, "error: _N is out of bounds.\n");
		exit(1);
	}
	if (!(1 <= _Q && _Q <= MAX_Q)) {
		fprintf(stderr, "error: _Q is out of bounds.\n");
		exit(1);
	}
	for (i = 0; i < _N - 1; ++i) {
		if (1 != scanf("%d", &_A[i])) {
			fprintf(stderr, "error: cannot read _A[%d].\n", i);
			exit(1);
		}
		if (!(0 <= _A[i] && _A[i] <= _N - 1)) {
			fprintf(stderr, "error: _A[%d] is out of bounds.\n", i);
			exit(1);
		}
		if (1 != scanf("%d", &_B[i])) {
			fprintf(stderr, "error: cannot read _B[%d].\n", i);
			exit(1);
		}
		if (!(0 <= _B[i] && _B[i] <= _N - 1)) {
			fprintf(stderr, "error: _B[%d] is out of bounds.\n", i);
			exit(1);
		}
		if (_A[i] == _B[i]) {
			fprintf(stderr, "error: _B[%d] is equal to _A[%d].\n", i, i);
			exit(1);
		}
		if (1 != scanf("%d", &_D[i])) {
			fprintf(stderr, "error: cannot read _D[%d].\n", i);
			exit(1);
		}
		if (!(1 <= _D[i] && _D[i] <= MAX_VALUE)) {
			fprintf(stderr, "error: _D[%d] is out of bounds.\n", i);
			exit(1);
		}
	}

	STop = 0;
	TTop = 0;

	for (j = 0; j < _Q; ++j) {
		if (2 != scanf("%d%d", &_S[j], &_T[j])) {
			fprintf(stderr, "error: cannot read L[%d] and R[%d].\n", j, j);
			exit(1);
		}

		if (STop + _S[j] > MAX_SUM_ST) {
			fprintf(stderr, "error: _S[0] + _S[1] + ... + _S[%d] is out of bounds.\n", j);
			exit(1);
		}

		if (TTop + _T[j] > MAX_SUM_ST) {
			fprintf(stderr, "error: _T[0] + _T[1] + ... + _T[%d] is out of bounds.\n", j);
			exit(1);
		}

		for (k = 0; k < _S[j]; ++k, ++STop) {
			if (1 != scanf("%d", &_X[STop])) {
				fprintf(stderr, "error: cannot read _X[%d][%d].\n", j, k);
				exit(1);
			}

			if (!(0 <= _X[STop] && _X[STop] <= _N - 1)) {
				fprintf(stderr, "error: cannot read _X[%d][%d].\n", j, k);
				exit(1);
			}
		}

		for (k = 0; k < _T[j]; ++k, ++TTop) {
			if (1 != scanf("%d", &_Y[TTop])) {
				fprintf(stderr, "error: cannot read _Y[%d][%d].\n", j, k);
				exit(1);
			}

			if (!(0 <= _Y[TTop] && _Y[TTop] <= _N - 1)) {
				fprintf(stderr, "error: cannot read _Y[%d][%d].\n", j, k);
				exit(1);
			}
		}
	}

	STop = 0;
	TTop = 0;
	Init(_N, _A, _B, _D);

	for (j = 0; j < _Q; ++j) {
		for (k = 0; k < _S[j]; k++) {
			_Qx[k] = _X[STop++];
		}
		for (k = 0; k < _T[j]; k++) {
			_Qy[k] = _Y[TTop++];
		}

		printf("%lld\n", Query(_S[j], _Qx, _T[j], _Qy));
	}
	return 0;
}
#endif

Compilation message (stderr)

factories.cpp: In function 'std::ostream& operator<<(std::ostream&, std::vector<int>&)':
factories.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < x.size(); i++) os << x[i] << sp;
                    ^
factories.cpp: In function 'std::ostream& operator<<(std::ostream&, std::vector<std::pair<int, int> >&)':
factories.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < x.size(); i++) os << x[i] << endl;
                    ^
factories.cpp: In function 'void dfs(int, int)':
factories.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < a[u].size(); i++)  {
                    ^
factories.cpp: In function 'void makeEdge()':
factories.cpp:110:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < allVertex.size(); i++) {
                    ^
factories.cpp: In function 'long long int Query(int, int*, int, int*)':
factories.cpp:142:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (ll i = 0; i < b[u].size(); i++) {
                    ^

• Subtask 1: 15 / 15
• Subtask 2: 18 / 18
• Subtask 3: 67 / 67