oj.uz

Submission #97106

# Submission time Handle Problem Language Result Execution time Memory
97106 2019-02-14T00:18:01 Z tincamatei Highway Tolls (IOI18_highway) C++14
0 / 100
 53 ms 3256 KB 
#include "highway.h"
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 90000;
const int MAX_M = 130000;

struct Edge {
	int a, b;
	int other(int x) {
		return a ^ b ^ x;
	}
} edge[MAX_M];

vector<int> graph[MAX_N];
vector<pair<int, int> > tree[2];
bool viz[MAX_N];

void buildSmallTrees(int eid, const std::vector<int> &U,
                              const std::vector<int> &V) {
	int X, Y;
	for(int i = 0; i < U.size(); ++i) {
		edge[i] = {U[i], V[i]};

		graph[U[i]].push_back(i);
		graph[V[i]].push_back(i);
	}
	X = edge[eid].a, Y = edge[eid].b;

	deque<pair<int, int> > q;
	q.push_back(make_pair(X, 0));
	q.push_back(make_pair(Y, 1));
	tree[0].push_back(make_pair(X, eid));
	tree[1].push_back(make_pair(Y, eid));
	viz[X] = viz[Y] = true;


	while(!q.empty()) {
		int nod, t;
		nod = q.front().first;
		t = q.front().second;
		q.pop_front();
		
		for(auto it: graph[nod]) {
			int son = edge[it].other(nod);
			if(!viz[son]) {
				viz[son] = true;
				tree[t].push_back(make_pair(son, it));
				q.push_back(make_pair(son, t));
			}
		}
	}
}

int searchTree(int t, int M, long long refpath) {
	int st = -1, dr = tree[t].size();
	vector<int> w(M, 0);

	reverse(tree[t].begin(), tree[t].end());

	while(dr - st > 1) {
		int mid = (st + dr) / 2;
		for(int i = 0; i < M; ++i)
			w[i] = 1;
		for(int i = 0; i <= mid; ++i)
			w[tree[t][i].second] = 0;
		if(ask(w) < refpath)
			dr = mid;
	}
	return tree[t][dr].first;
}

void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B) {
	int M = U.size();
	int st, dr;
	long long refPath;
	vector<int> w(M, 1);
	refPath = ask(w);

	st = -1, dr = M;
	while(dr - st > 1) {
		int mid = (st + dr) / 2;
		for(int i = 0; i <= mid; ++i)
			w[i] = 0;
		for(int i = mid + 1; i < M; ++i)
			w[i] = 1;

		if(ask(w) < refPath)
			dr = mid;
		else
			st = mid;
	}

	// Muchia (U[dr], V[dr]) face parte dintr-un drum sigur
	
	buildSmallTrees(dr, U, V);
	answer(searchTree(0, M, refPath), searchTree(1, M, refPath));
}

Compilation message

highway.cpp: In function 'void buildSmallTrees(int, const std::vector<int>&, const std::vector<int>&)':
highway.cpp:23:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < U.size(); ++i) {
                 ~~^~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 2444 KB Output is incorrect: more than 100 calls to ask.
2 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 2544 KB Output is incorrect: more than 100 calls to ask.
2 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 27 ms 3256 KB Output is incorrect: more than 100 calls to ask.
2 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 2464 KB Output is incorrect: more than 100 calls to ask.
2 Halted 0 ms 0 KB -

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 33 ms 3240 KB Output is incorrect: more than 100 calls to ask.
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Incorrect 53 ms 3172 KB Output is incorrect: more than 100 calls to ask.
2 Halted 0 ms 0 KB -