#include "parks.h"
#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template<typename t>
using matrix = vector<vector<t>>;
int construct_roads(std::vector<int> x, std::vector<int> y) {
if (x.size() == 1) {
build({}, {}, {}, {});
return 1;
}
int n = x.size();
std::vector<int> u, v, a, b;
int dx[]{1,0,-1,0};
int dy[]{0,1,0,-1};
vector<int> pai(n);
int comp = n;
iota(all(pai),0);
auto find =[&](int id, auto f){
if(pai[id] = id)
return id;
return pai[id] = f(pai[id],f);
};
auto onion =[&](int a, int b){
pa = find(a,find);
pb = find(b,find);
if(pa != pb){
comp--;
u.push_back(a);
v.push_back(b);
}
};
map<pii,int> fount;
for(int i = 0; i < n; i++)
fount[{x[i],y[i]}] = i;
for(int i = 0; i < n; i++){
for(int j = 0; j < 4; j++){
int xi = x[i] + dx[j]*2, yi = y[i]+dy[j]*2;
if(fount.count({xi,yi}))
onion(i,fount[{xi,yi}]);
}
}
if(comp > 1)
return 0;
set<pii> bench;
for(int i = 0; i < n-1; i++){
int cx = (x[u[i]]+x[v[i]])>>1, cy = (y[u[i]]+y[v[i]])>>1;
bool ok = 0;
for(int j = 0; j < 4; j++){
int xi = x[i] + dx[j], yi = y[i]+dy[j];
if((xi&1)||(yi&1))
continue;
if(!bench.count({xi,yi})){
a.push_back(xi);
b.push_back(yi);
ok = 1;
break;
}
}
if(!ok)
return 0;
}
return 1;
}
Compilation message
parks.cpp: In lambda function:
parks.cpp:35:9: error: 'pa' was not declared in this scope; did you mean 'pai'?
35 | pa = find(a,find);
| ^~
| pai
parks.cpp: In instantiation of 'construct_roads(std::vector<int>, std::vector<int>)::<lambda(int, auto:23)> [with auto:23 = construct_roads(std::vector<int>, std::vector<int>)::<lambda(int, auto:23)>]':
parks.cpp:35:25: required from here
parks.cpp:30:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
30 | if(pai[id] = id)
parks.cpp:36:9: error: 'pb' was not declared in this scope; did you mean 'b'?
36 | pb = find(b,find);
| ^~
| b
parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:61:13: warning: unused variable 'cx' [-Wunused-variable]
61 | int cx = (x[u[i]]+x[v[i]])>>1, cy = (y[u[i]]+y[v[i]])>>1;
| ^~
parks.cpp:61:40: warning: unused variable 'cy' [-Wunused-variable]
61 | int cx = (x[u[i]]+x[v[i]])>>1, cy = (y[u[i]]+y[v[i]])>>1;
| ^~
