Submission #121625

#	Time	Username	Problem	Language	Result	Execution time	Memory
121625		Sorting	Highway Tolls (IOI18_highway)	C++14	51 / 100	379 ms	17196 KiB

highway

#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(1);
 
long long n, m;
vector<int> adj[MAXN], idx[MAXN], w;
bool used[MAXN];
int d[MAXN];

long long a, b;
long long sm;

queue<long long> q;

void bfs(long long x){
	for(long long i = 0; i <= n; i++){
		d[i] = n + m + 2;
	}
 
	assert(q.empty());

	q.push(x);
	d[x] = 0; 
 
	while(!q.empty()){
		long long u = q.front();
		q.pop();

		for(long long i = 0; i < adj[u].size(); i++){
			long long to = adj[u][i];
			long long j = idx[u][i];
 
			if(d[to] > d[u] + 1){
				d[to] = d[u] + 1;
				q.push(to);
			}
		}
	}
}

bool cmp(pair<long long, long long> lvalue, pair<long long, long long> rvalue){
	return d[lvalue.second] < d[rvalue.second];
}

long long away(int x, const vector<int> &U, const vector<int> &V){
	bfs(x);
 
	vector<pair<long long, long long> > v;

	for(int i = 0; i < m; i++){
		v.push_back({i, d[U[i]] <= d[V[i]] ? V[i] : U[i]});
	}

	sort(v.begin(), v.end(), cmp);

	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(V[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 (stderr)

highway.cpp: In function 'void bfs(long long int)':
highway.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(long long i = 0; i < adj[u].size(); i++){
                        ~~^~~~~~~~~~~~~~~
highway.cpp:39:14: warning: unused variable 'j' [-Wunused-variable]
    long long j = idx[u][i];
              ^

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 6 / 6
• Subtask 4: 33 / 33
• Subtask 5: 0 / 18
• Subtask 6: 0 / 31