This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#define DEBUG 0
#include <bits/stdc++.h>
using namespace std;
#if DEBUG
// basic debugging macros
int __i__,__j__;
#define printLine(l) for(__i__=0;__i__<l;__i__++){cout<<"-";}cout<<endl
#define printLine2(l,c) for(__i__=0;__i__<l;__i__++){cout<<c;}cout<<endl
#define printVar(n) cout<<#n<<": "<<n<<endl
#define printArr(a,l) cout<<#a<<": ";for(__i__=0;__i__<l;__i__++){cout<<a[__i__]<<" ";}cout<<endl
#define print2dArr(a,r,c) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<a[__i__][__j__]<<" ";}cout<<endl;}
#define print2dArr2(a,r,c,l) cout<<#a<<":\n";for(__i__=0;__i__<r;__i__++){for(__j__=0;__j__<c;__j__++){cout<<setw(l)<<setfill(' ')<<a[__i__][__j__]<<" ";}cout<<endl;}
// advanced debugging class
// debug 1,2,'A',"test";
class _Debug {
public:
template<typename T>
_Debug& operator,(T val) {
cout << val << endl;
return *this;
}
};
#define debug _Debug(),
#else
#define printLine(l)
#define printLine2(l,c)
#define printVar(n)
#define printArr(a,l)
#define print2dArr(a,r,c)
#define print2dArr2(a,r,c,l)
#define debug
#endif
// define
#define MAX_VAL 999999999
#define MAX_VAL_2 999999999999999999LL
#define EPS 1e-6
#define mp make_pair
#define pb push_back
// typedef
typedef unsigned int UI;
typedef long long int LLI;
typedef unsigned long long int ULLI;
typedef unsigned short int US;
typedef pair<int,int> pii;
typedef pair<LLI,LLI> plli;
typedef vector<int> vi;
typedef vector<LLI> vlli;
typedef vector<pii> vpii;
typedef vector<plli> vplli;
// ---------- END OF TEMPLATE ----------
#include "parks.h"
map<pii,int> M;
int parent[200000];
int find(int n) {
if (parent[n] != n) parent[n] = find(parent[n]);
return parent[n];
}
int construct_roads(vector<int> x,vector<int> y) {
int i,n = x.size();
vi u,v,a,b;
for (i = 0; i < n; i++) M[mp(x[i],y[i])] = parent[i] = i;
for (i = 0; i < n; i++) {
if (((x[i]+y[i])/2) & 1) {
if (M.count(mp(x[i]-2,y[i])) && (find(M[mp(x[i]-2,y[i])]) != find(i))) {
u.pb(M[mp(x[i]-2,y[i])]),v.pb(i);
parent[find(M[mp(x[i]-2,y[i])])] = find(i);
a.pb(x[i]-1),b.pb(y[i]+1);
}
if (M.count(mp(x[i],y[i]-2)) && (find(M[mp(x[i],y[i]-2)]) != find(i))) {
u.pb(M[mp(x[i],y[i]-2)]),v.pb(i);
parent[find(M[mp(x[i],y[i]-2)])] = find(i);
a.pb(x[i]-1),b.pb(y[i]-1);
}
}
else {
if (M.count(mp(x[i],y[i]-2)) && (find(M[mp(x[i],y[i]-2)]) != find(i))) {
u.pb(M[mp(x[i],y[i]-2)]),v.pb(i);
parent[find(M[mp(x[i],y[i]-2)])] = find(i);
a.pb(x[i]+1),b.pb(y[i]-1);
}
if (M.count(mp(x[i]-2,y[i])) && (find(M[mp(x[i]-2,y[i])]) != find(i))) {
u.pb(M[mp(x[i]-2,y[i])]),v.pb(i);
parent[find(M[mp(x[i]-2,y[i])])] = find(i);
a.pb(x[i]-1),b.pb(y[i]-1);
}
}
}
for (i = 0; i < n; i++) {
if (find(i) != find(0)) return 0;
}
build(u,v,a,b);
return 1;
}
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