#include <vector>
#include <map>
#include <queue>
using namespace std;
map<pair<int,int>,int>d,vis;
vector<pair<int,int>>z;
queue<pair<int,int>>Q;
int x1=0,y11=0;
void check(int x,int y)
{
if (d.find({x,y})!=d.end()&&!vis[{x,y}])
{
Q.push({x,y});
vis[{x,y}]=1;
z.push_back({d[{x1,y11}],d[{x,y}]});
}
}
void bfs(int x,int y)
{
Q.push({x,y});
vis[{x,y}]=1;
while (Q.size())
{
x,y;
tie(x,y)=Q.front();
x1=x,y11=y;
Q.pop();
check(x,y-2);
check(x,y+2);
check(x-2,y);
check(x+2,y);
}
}
int construct_roads(vector<int> x, vector<int> y)
{
int n=x.size();
for (int i=0;i<n;i++)
d[{x[i],y[i]}]=i;
int reqx=1e9+10,reqy=1e9+10;
for (int i=0;i<n;i++)
{
if (x[i]<reqx)
{
reqx=x[i];
reqy=y[i];
}
else if (x[i]==reqx&&reqy<y[i])
reqy=y[i];
}
bfs(reqx,reqy);
for (int i=0;i<n;i++)
{
if (!vis[{x[i],y[i]}])
return 0;
}
vis={};
vector<int>u,v,a,b;
cout<<endl;
for (auto i:z)
{
u.push_back(i.first);
v.push_back(i.second);
pair<int,int>r,q;
r.first=x[i.first],r.second=y[i.first];
q.first=x[i.second],q.second=y[i.second];
if (r.first-q.first==0)
{
a.push_back(r.first-1);
b.push_back((r.second+q.second)/2);
if (vis[{a.back(),b.back()}])
{
a.pop_back();
a.push_back(r.first+1);
if (vis[{a.back(),b.back()}])
return 0;
vis[{a.back(),b.back()}]=1;
}
else
vis[{a.back(),b.back()}]=1;
}
else
{
a.push_back((r.first+q.first)/2);
b.push_back(r.second-1);
if (vis[{a.back(),b.back()}])
{
b.pop_back();
b.push_back(r.second+1);
if (vis[{a.back(),b.back()}])
return 0;
vis[{a.back(),b.back()}]=1;
}
else
vis[{a.back(),b.back()}]=1;
}
}
build(u,v,a,b);
return 1;
}
Compilation message
parks.cpp: In function 'void bfs(int, int)':
parks.cpp:24:3: warning: left operand of comma operator has no effect [-Wunused-value]
24 | x,y;
| ^
parks.cpp:24:6: warning: right operand of comma operator has no effect [-Wunused-value]
24 | x,y;
| ^
parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:58:2: error: 'cout' was not declared in this scope
58 | cout<<endl;
| ^~~~
parks.cpp:4:1: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
3 | #include <queue>
+++ |+#include <iostream>
4 | using namespace std;
parks.cpp:58:8: error: 'endl' was not declared in this scope
58 | cout<<endl;
| ^~~~
parks.cpp:4:1: note: 'std::endl' is defined in header '<ostream>'; did you forget to '#include <ostream>'?
3 | #include <queue>
+++ |+#include <ostream>
4 | using namespace std;
parks.cpp:97:2: error: 'build' was not declared in this scope
97 | build(u,v,a,b);
| ^~~~~
