Submission #890273

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
890273	2023-12-20T22:42:49 Z	LucaIlie	Road Construction (JOI21_road_construction)	C++17	Compilation error	0 ms	0 KB

road_construction

#include <bits/stdc++.h>

#define int long long

using namespace std;

struct point {
    int x, y;
};

const int MAX_N = 2.5e5;
const int MAX_X = 1e9;
const int MIN_X = -1e9;
point v[MAX_N];

struct AIB {
    vector<int> pos;
    vector<int> aib;

    void init() {
        pos.clear();
        aib.clear();
    }

    void add( int i ) {
        pos.push_back( i );
    }

    void prep() {
        pos.push_back( -MAX_X - 1 );
        sort( pos.begin(), pos.end() );
        pos.resize( unique( pos.begin(), pos.end() ) - pos.begin() );
        for ( int i = 0; i < pos.size(); i++ )
            aib.push_back( 0 );
    }

    void clear() {
        for ( int i = 0; i < aib.size(); i++ )
            aib[i] = 0;
    }

    void update( int i, int x ) {
        int l = 0, r = pos.size();
        while ( r - l > 1 ) {
            int p = (l + r) / 2;
            if ( pos[p] > i )
                r = p;
            else
                l = p;
        }
        i = l;
        while ( i < aib.size() ) {
            aib[i] += x;
            i += (i & -i);
        }
    }

   int query( int i ) {
        int l = 0, r = pos.size();
        while ( r - l > 1 ) {
            int p = (l + r) / 2;
            if ( pos[p] > i )
                r = p;
            else
                l = p;
        }
        i = l;
       int s = 0;
        while ( i > 0 ) {
            s += aib[i];
            i -= (i & -i);
        }
        return s;
    }
};

struct AIB2D {
    vector<int> pos;
    vector<AIB> aib;
    vector<point> pts;
    AIB emptyAIB;

    void init() {
        pos.clear();
        aib.clear();
    }

    void add( int i, int j ) {
        pts.push_back( { i, j } );
        pos.push_back( i );
        emptyAIB.init();
    }

    void prep() {
        pos.push_back( -MAX_X - 1 );
        sort( pos.begin(), pos.end() );
        pos.resize( unique( pos.begin(), pos.end() ) - pos.begin() );
        for ( int i = 0; i < pos.size(); i++ )
            aib.push_back( emptyAIB );
        for ( point q: pts ) {
            int l = 0, r = pos.size();
            while ( r - l > 1 ) {
                int p = (l + r) / 2;
                if ( pos[p] > q.x )
                    r = p;
                else
                    l = p;
            }
            if ( pts[l] != q.x )
                exit( 1 );
            int i = l;
            while ( i < aib.size() ) {
                aib[i].add( q.y );
                i += (i & -i);
            }
        }
        for ( int i = 0; i < pos.size(); i++ )
            aib[i].prep();
    }

    void clear() {
        for ( int i = 0; i < aib.size(); i++ )
            aib[i].clear();
    }

    void update( int i, int j, int x ) {
        int l = 0, r = pos.size();
        while ( r - l > 1 ) {
            int p = (l + r) / 2;
            if ( pos[p] > i )
                r = p;
            else
                l = p;
        }
        i = l;
        while ( i < aib.size() ) {
            aib[i].update( j, x );
            i += (i & -i);
        }
    }

    int query( int i, int j ) {
        int l = 0, r = pos.size();
        while ( r - l > 1 ) {
            int p = (l + r) / 2;
            if ( pos[p] > i )
                r = p;
            else
                l = p;
        }
        i = l;
        int s = 0;
        while ( i > 0 ) {
            s += aib[i].query( j );
            i -= (i & -i);
        }
        return s;
    }
} leftPoints, rightPoints;

signed main() {
    int n, k;

    cin >> n >> k;
    for ( int i = 0; i < n; i++ )
        cin >> v[i].x >> v[i].y;

    sort( v, v + n, []( point a, point b ) {
        if ( a.x == b.x )
            return a.y < b.y;
        return a.x < b.x;
    } );


    leftPoints.init();
    rightPoints.init();
    for ( int i = 0; i < n; i++ ) {
        leftPoints.add( v[i].y, -v[i].x - v[i].y );
        rightPoints.add( v[i].y, -v[i].x + v[i].y );
    }
    leftPoints.prep();
    rightPoints.prep();

    int ld = 0, rd = 2 * (MAX_X - MIN_X);
    while ( rd - ld > 1 ) {
        int d = (ld + rd) / 2;

        int pairs = 0;
        leftPoints.clear();
        rightPoints.clear();
        for ( int i = 0; i < n; i++ ) {
            pairs += leftPoints.query( v[i].y, d - (v[i].x + v[i].y) );
            pairs += rightPoints.query( MAX_X, d - (v[i].x - v[i].y) ) - rightPoints.query( v[i].y, d - (v[i].x - v[i].y) );

            leftPoints.update( v[i].y, -v[i].x - v[i].y, 1 );
            rightPoints.update( v[i].y, -v[i].x + v[i].y, 1 );
        }

        if ( pairs < k )
            ld = d;
        else
            rd = d;
    }
    int d = rd;

    vector<int> sol;
    for ( int i = 0; i < n; i++ ) {
        for ( int j = i + 1; j < n; j++ ) {
            if ( abs( v[i].x - v[j].x ) + abs( v[i].y - v[j].y ) < d )
                sol.push_back( abs( v[i].x - v[j].x ) + abs( v[i].y - v[j].y ) );
        }
    }

    while ( sol.size() < k )
        sol.push_back( d );
    sort( sol.begin(), sol.end() );
    for( int x: sol )
        cout << x << "\n";

    return 0;
}

Compilation message

road_construction.cpp: In member function 'void AIB::prep()':
road_construction.cpp:33:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         for ( int i = 0; i < pos.size(); i++ )
      |                          ~~^~~~~~~~~~~~
road_construction.cpp: In member function 'void AIB::clear()':
road_construction.cpp:38:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         for ( int i = 0; i < aib.size(); i++ )
      |                          ~~^~~~~~~~~~~~
road_construction.cpp: In member function 'void AIB::update(long long int, long long int)':
road_construction.cpp:52:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         while ( i < aib.size() ) {
      |                 ~~^~~~~~~~~~~~
road_construction.cpp: In member function 'void AIB2D::prep()':
road_construction.cpp:98:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |         for ( int i = 0; i < pos.size(); i++ )
      |                          ~~^~~~~~~~~~~~
road_construction.cpp:109:25: error: no match for 'operator!=' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} and 'long long int')
  109 |             if ( pts[l] != q.x )
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:1064:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator!=(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)'
 1064 |     operator!=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1064:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:1144:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator!=(std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const std::__cxx11::sub_match<_BiIter>&)'
 1144 |     operator!=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1144:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:1237:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator!=(const std::__cxx11::sub_match<_BiIter>&, std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1237 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1237:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:1311:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&)'
 1311 |     operator!=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1311:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'long long int'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:1405:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1405 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1405:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:1479:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const typename std::iterator_traits<_Iter>::value_type&, const std::__cxx11::sub_match<_BiIter>&)'
 1479 |     operator!=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1479:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'long long int'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:1579:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1579 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:1579:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:110,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/regex.h:2126:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator!=(const std::__cxx11::match_results<_BiIter, _Alloc>&, const std::__cxx11::match_results<_BiIter, _Alloc>&)'
 2126 |     operator!=(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/10/bits/regex.h:2126:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/stl_pair.h:496:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator!=(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)'
  496 |     operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_pair.h:496:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::pair<_T1, _T2>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:372:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)'
  372 |     operator!=(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:372:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::reverse_iterator<_Iterator>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:410:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)'
  410 |     operator!=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:410:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::reverse_iterator<_Iterator>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:1444:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)'
 1444 |     operator!=(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:1444:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::move_iterator<_IteratorL>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:67,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/stl_iterator.h:1501:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)'
 1501 |     operator!=(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/10/bits/stl_iterator.h:1501:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::move_iterator<_IteratorL>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/iosfwd:40,
                 from /usr/include/c++/10/ios:38,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/postypes.h:227:5: note: candidate: 'template<class _StateT> bool std::operator!=(const std::fpos<_StateT>&, const std::fpos<_StateT>&)'
  227 |     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/10/bits/postypes.h:227:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::fpos<_StateT>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/string:41,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from road_construction.cpp:1:
/usr/include/c++/10/bits/allocator.h:213:5: note: candidate: 'template<class _T1, class _T2> bool std::operator!=(const std::allocator<_CharT>&, const std::allocator<_T2>&)'
  213 |     operator!=(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/10/bits/allocator.h:213:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   '__gnu_cxx::__alloc_traits<std::allocator<point>, point>::value_type' {aka 'point'} is not derived from 'const std::allocator<_CharT>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/basic_string.h:48,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from road_construction.cpp:1:
/usr/include/c++/10/string_view:525:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)'
  525 |     operator!=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/10/string_view:525:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   'point' is not derived from 'std::basic_string_view<_CharT, _Traits>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/basic_string.h:48,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from road_construction.cpp:1:
/usr/include/c++/10/string_view:531:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(std::basic_string_view<_CharT, _Traits>, std::__type_identity_t<std::basic_string_view<_CharT, _Traits> >)'
  531 |     operator!=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/10/string_view:531:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   'point' is not derived from 'std::basic_string_view<_CharT, _Traits>'
  109 |             if ( pts[l] != q.x )
      |                              ^
In file included from /usr/include/c++/10/bits/basic_string.h:48,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from road_construction.cpp:1:
/usr/include/c++/10/string_view:538:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(std::__type_identity_t<std::basic_string_view<_CharT, _Traits> >, std::basic_string_view<_CharT, _Traits>)'
  538 |     operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/10/string_view:538:5: note:   template argument deduction/substitution failed:
road_construction.cpp:109:30: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and