#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;
}
q.clear();
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
highway.cpp: In function 'void bfs(long long int)':
highway.cpp:28:5: error: 'class std::queue<long long int>' has no member named 'clear'
q.clear();
^~~~~
highway.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(long long i = 0; i < adj[u].size(); i++){
~~^~~~~~~~~~~~~~~
highway.cpp:38:14: warning: unused variable 'j' [-Wunused-variable]
long long j = idx[u][i];
^
