#include "parks.h"
#define pb push_back
#include<bits/stdc++.h>
using namespace std;
int construct_roads(std::vector<int> x, std::vector<int> y)
{
if (x.size() == 1) {
build({}, {}, {}, {});
return 1;
}
vector < pair < int, int > > g;
int cnt = 0;
for (auto pos: y)
{
g.pb(make_pair(pos, cnt ++));
}
sort(g.begin(), g.end());
for (int i = 0 ;i < g.size(); ++ i)
{
if(i == 0)continue;
if(g[i].first - g[i-1].first != 2)return 0;
}
std::vector<int> u, v, a, b;
for (int i = 0 ;i < g.size(); ++ i)
{
if(i == 0)continue;
u.pb(g[i-1].second);
v.pb(g[i].second);
a.pb(3);
b.pb(g[i].first-1);
}
build(u, v, a, b);
return 1;
}
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