Submission #1356677

#	Time	Username	Problem	Language	Result	Execution time	Memory
1356677		Faisal_Saqib	Fountain Parks (IOI21_parks)	C++17	Compilation error	0 ms	0 KiB

parks

#include "parks.h"
#include <bits/stdc++.h>
using namespace std;
const int N=1e6;
int p[N];
int get(int x)
{
    return (par[x]==x)?x:par[x]=get(par[x]);
}
bool merge(int x,int y)
{
    x=get(x);
    y=get(y);
    if(x==y)return 0;
    par[x]=y;
    return 1;
}
int construct_roads(std::vector<int> x, std::vector<int> y) {
    int n=x.size();
    map<pair<int,int>,int> ind;
    for(int i=0;i<n;i++)
    {
        p[i]=i;
        ind[{x[i],y[i]}]=i;
    }
    vector<int> u,v,a,b;
    for(int i=0;i<n;i++)
    {
        auto it=ind.find({x[i]-2,y[i]});
        int j=ind[{x[i]-2,y[i]}];
        if(it!=ind.end() and merge(i,j))
        {
            u.push_back(j);
            v.push_back(i);
            a.push_back(x[i]-1);
            b.push_back(y[i]+((x[i]==2)?-1:+1));
        }
        it=ind.find({x[i],y[i]-2});
        j=ind[{x[i],y[i]-2}];
        if(it!=ind.end())
        {
            u.push_back(j);
            v.push_back(i);
            a.push_back(x[i]-1);
            b.push_back(y[i]-1);
        }
    }
    int cn=0;
    for(int i=0;i<n;i++)
    {
        if(get(i)==i)
        {
            cn++;
        }
    }
    if(cn>1)
    {
        return 0;
    }
    build(u,v,a,b);
    return 1;
}

Compilation message (stderr)

parks.cpp: In function 'int get(int)':
parks.cpp:8:13: error: 'par' was not declared in this scope; did you mean '__pstl::execution::v1::par'?
    8 |     return (par[x]==x)?x:par[x]=get(par[x]);
      |             ^~~
      |             __pstl::execution::v1::par
In file included from /usr/include/c++/13/pstl/glue_algorithm_defs.h:15,
                 from /usr/include/c++/13/algorithm:73,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:51,
                 from parks.cpp:2:
/usr/include/c++/13/pstl/execution_defs.h:111:45: note: '__pstl::execution::v1::par' declared here
  111 | _GLIBCXX17_INLINE constexpr parallel_policy par{};
      |                                             ^~~
parks.cpp: In function 'bool merge(int, int)':
parks.cpp:15:5: error: 'par' was not declared in this scope; did you mean '__pstl::execution::v1::par'?
   15 |     par[x]=y;
      |     ^~~
      |     __pstl::execution::v1::par
/usr/include/c++/13/pstl/execution_defs.h:111:45: note: '__pstl::execution::v1::par' declared here
  111 | _GLIBCXX17_INLINE constexpr parallel_policy par{};
      |                                             ^~~