oj.uz

Submission #121601

# Submission time Handle Problem Language Result Execution time Memory
121601 2019-06-26T20:26:12 Z Sorting Highway Tolls (IOI18_highway) C++14
0 / 100
 32 ms 11788 KB 
#include <bits/stdc++.h>
#include "highway.h"
 
using namespace std;
 
const long long MAXN = 1e5 + 7;
 
long long ask(const vector<int> &w);
void answer(int s, int t);
 
mt19937 mt(3);
 
long long n, m;
vector<int> adj[MAXN], idx[MAXN], w;
bool used[MAXN];

long long a, b;
long long sm;

queue<long long> q;
vector<int> temp;

vector<pair<long long, long long> > bfs(long long x){
	for(long long i = 0; i < n; i++){
		used[i] = false;
	}
 
	q.push(x);
	
	vector<pair<long long, long long> > v;
 
	while(!q.empty()){
		long long u = q.front();
		q.pop();
 
		if(used[u]){
			continue;
		}
		used[u] = true;

		
		temp.clear();
		for(int i = 0; i < (int)adj[u].size(); i++){
			temp.push_back(i + 1);
		}

		for(int i = 0; i < (int)adj[u].size(); i++){
			int x = mt() % adj[u].size();
			int y = mt() % adj[u].size();

			swap(temp[x], temp[y]);
		}
 
		for(long long i = 0; i < adj[u].size(); i++){
			long long to = adj[u][i];
			long long j = idx[u][i];
 
			if(!used[to]){
				q.push(to);
			}
		}

		for(long long i = 0; i < adj[u].size(); i++){
			long long to = adj[u][temp[i]];
			long long j = idx[u][temp[i]];
 
			if(!used[to]){
				v.push_back({j, to});
			}
		}
	}
 
	return v;
}

long long away(int x, const vector<int> &U, const vector<int> &V){
	vector<pair<long long, long long> > v = bfs(x);
 
	while((long long)v.size() != m);

	long long l = 0, r = (long long)v.size() - 1;
 
	while(l != r){
		long long mid = (l + r) >> 1;
		 
		for(long long i = 0; i < m; i++){
			w[i] = 0;
		}

		for(long long i = 0; i <= mid; i++){
			w[ v[i].first ] = 1;
		}

		long long score = ask(w); 

		if(score == (sm / a) * b){
			r = mid;
		}
		else{
			l = mid + 1;
		}
	}

	return v[l].second;
}
 
void find_pair(int N, vector<int> U, vector<int> V, int A, int B){
	srand(time(NULL));

	n = N;
	m = U.size();
 
	for(long long i = 0; i < m; i++){
		adj[V[i]].push_back(U[i]);
		adj[U[i]].push_back(V[i]);
 
		idx[V[i]].push_back(i);
		idx[U[i]].push_back(i);
		w.push_back(0);
	}
 
	sm = ask(w);
	a = A;
	b = B;
 
	long long l = 0, r = m - 1;
 
	while(l != r){
		long long mid = (l + r) / 2;
 
		for(long long i = 0; i < m; i++){
			w[i] = 0; 
		}
		for(long long i = mid + 1; i <= r; i++){
			w[i] = 1;
		}
 
		long long score = ask(w);
		score -= sm;
 
		if(score){
			l = mid + 1;
		}
		else{
			r = mid;
		}
	}
 
	long long x, y;
 
	x = away(U[l], U, V);
 
	y = away(x, U, V);
 
	answer(x, y);
}
/*
9 1 2
4 8
4 2
8 0
2 5
2 7
2 3
0 1
0 6
*/

Compilation message

highway.cpp: In function 'std::vector<std::pair<long long int, long long int> > bfs(long long int)':
highway.cpp:54:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(long long i = 0; i < adj[u].size(); i++){
                        ~~^~~~~~~~~~~~~~~
highway.cpp:56:14: warning: unused variable 'j' [-Wunused-variable]
    long long j = idx[u][i];
              ^
highway.cpp:63:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(long long i = 0; i < adj[u].size(); i++){
                        ~~^~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 12 ms 9888 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Runtime error 13 ms 10100 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Runtime error 26 ms 11740 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# Verdict Execution time Memory Grader output
1 Runtime error 14 ms 10092 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Runtime error 32 ms 11788 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Runtime error 32 ms 11696 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -