답안 #64779

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
64779	2018-08-05T15:44:02 Z	bazsi700	The Forest of Fangorn (CEOI14_fangorn)	C++14	컴파일 오류	0 ms	0 KB

fangorn

#include <bits/stdc++.h>

using namespace std;
#define ll long long
#define C complex<ll>
#define X real()
#define Y imag()

ll w,h,n,c;
C g;
C camp[2005];
C tree[10005];
bool can[15];

int sign(ll x) {
    if(x > 0) {
        return 1;
    } else if(x == 0) {
        return 0;
    } else {
        return -1;
    }
}

ll cross(C a, C b) { //-1 bal, 0 egyenes, 1 jobb A hoz képest a B
    return sign(((a*conj(b)).Y));
}

bool isbad[2005][2005];
bool isbadv[2005];
int leftest[2005];
int rightest[2005];

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll gx,gy;
    cin >> w >> h >> gx >> gy >> c;
    g = {gx,gy};
    for(int i = 0; i < c; i++) {
        ll x,y;
        cin >> x >> y;
        camp[i] = {x,y};
    }
    cin >> n;
    for(int i = 0; i < n; i++) {
        ll x,y;
        cin >> x >> y;
        tree[i] = {x,y};
    }
    for(int i = 0; i < n; i++) {
        bool bad = false;
        int fix = (i == 0 ? 1 : 0);
        for(int j = 0; j < n; j++) {
            if(j == i || j == fix) {
                continue;
            }
            if(cross(tree[fix]-tree[i],tree[j]-tree[i]) > 0) {
                fix = i;
            }
        }
        for(int j = 0; j < n; j++) {
            if(j == i || j == fix) {
                continue;
            }
            if(cross(tree[fix]-tree[i],tree[j]-tree[i]) > 0) {
                bad = true;
            }
        }
        if(bad) {
            isbadv[i] = true;
            for(int j = 0; j < n; j++) {
                isbad[i][j] = isbad[j][i] = true;
            }
        } else {
            leftest[i] = fix;
        }
    }
    for(int i = 0; i < n; i++) {
        if(isbadv[i]) {
            continue;
        }
        int fix = (i == 0 ? 1 : 0);
        for(int j = 0; j < n; j++) {
            if(j == i || j == fix) {
                continue;
            }
            if(cross(tree[fix]-tree[i],tree[j]-tree[i]) < 0) {
                fix = i;
            }
        }
        rightest[i] = fix;
    }
    vector<int> pr;
    for(int i = 0; i < c; i++) {
        bool good = true;
        for(int x = 0; x < n; x++) {
            for(int y = x+1; y < n; y++) {
                if(isbad[x][y]) {
                    if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                        good = false;
                    }
                }
            }
        }
        if(!good) {
            continue;
        }
        for(int a2 = 0; a2 < n; a2++) {
            if(!isbadv[a2]) {
                int b1 = a2;
                int a1 = leftest[a2];
                int b2 = rightest[a2];
                if(b2 == a1 || b2 == a2) {
                    continue;
                }
                if(cross(tree[a2]-tree[a1],camp[i]-tree[a1]) == cross(tree[a2]-tree[a1],g-tree[a1]) && cross(tree[b2]-tree[b1],camp[i]-tree[b1]) == cross(tree[b2]-tree[b1],g-tree[b1])) {
                    continue;
                }
                if(cross(tree[a2]-tree[a1],tree[b2]-tree[a1]) != cross(tree[a2]-tree[a1],camp[i]-tree[a1]) && cross(tree[b2]-tree[b1],tree[a1]-tree[b1]) != cross(tree[b2]-tree[b1],camp[i]-tree[b1])) {
                    good = false;
                }
                if(cross(tree[a2]-tree[a1],tree[b2]-tree[a1]) != cross(tree[a2]-tree[a1],g-tree[a1]) && cross(tree[b2]-tree[b1],tree[a1]-tree[b1]) != cross(tree[b2]-tree[b1],g-tree[b1])) {
                    good = false;
                }
            }
        }
        if(good) {
            pr.push_back(i+1);
        }
    }
    cout << pr.size() << "\n";
    for(int el : pr) {
        cout << el << " ";
    }
    return 0;
}

Compilation message

fangorn.cpp: In function 'int main()':
fangorn.cpp:101:47: error: no match for 'operator-' (operand types are 'std::complex<long long int>' and 'int')
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                              ~^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/stl_iterator.h:389:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator-(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:389:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/stl_iterator.h:1191:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator-(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1191:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/complex:356:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const std::complex<_Tp>&)
     operator-(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/7/complex:356:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   mismatched types 'const std::complex<_Tp>' and 'int'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/complex:365:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const _Tp&)
     operator-(const complex<_Tp>& __x, const _Tp& __y)
     ^~~~~~~~
/usr/include/c++/7/complex:365:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/complex:374:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const _Tp&, const std::complex<_Tp>&)
     operator-(const _Tp& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/7/complex:374:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   mismatched types 'const std::complex<_Tp>' and 'int'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/complex:451:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&)
     operator-(const complex<_Tp>& __x)
     ^~~~~~~~
/usr/include/c++/7/complex:451:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   candidate expects 1 argument, 2 provided
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:68,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/stl_deque.h:351:5: note: candidate: template<class _Tp, class _Ref, class _Ptr> typename std::_Deque_iterator<_Tp, _Ref, _Ptr>::difference_type std::operator-(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator-(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:351:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:68,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/stl_deque.h:363:5: note: candidate: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> typename std::_Deque_iterator<_Tp, _Ref, _Ptr>::difference_type std::operator-(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator-(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:363:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/vector:65:0,
                 from /usr/include/c++/7/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:86,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/stl_bvector.h:208:3: note: candidate: std::ptrdiff_t std::operator-(const std::_Bit_iterator_base&, const std::_Bit_iterator_base&)
   operator-(const _Bit_iterator_base& __x, const _Bit_iterator_base& __y)
   ^~~~~~~~
/usr/include/c++/7/bits/stl_bvector.h:208:3: note:   no known conversion for argument 1 from 'std::complex<long long int>' to 'const std::_Bit_iterator_base&'
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:403:5: note: candidate: template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__minus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/7/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__minus, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/7/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__minus, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/7/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__minus, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/7/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__minus, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/7/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from fangorn.cpp:1:
/usr/include/c++/7/valarray:1173:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__minus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(-, __minus)
 ^
/usr/include/c++/7/valarray:1173:1: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::valarray<_Tp>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from fangorn.cpp:1:
/usr/include/c++/7/valarray:1173:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__minus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(-, __minus)
 ^
/usr/include/c++/7/valarray:1173:1: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   'std::complex<long long int>' is not derived from 'const std::valarray<_Tp>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from fangorn.cpp:1:
/usr/include/c++/7/valarray:1173:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__minus, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(-, __minus)
 ^
/usr/include/c++/7/valarray:1173:1: note:   template argument deduction/substitution failed:
fangorn.cpp:101:48: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                ^
fangorn.cpp:101:83: error: no match for 'operator-' (operand types are 'std::complex<long long int>' and 'int')
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                                            ~~~~~~~^~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/stl_iterator.h:389:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator-(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:389:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:84: note:   'std::complex<long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                                                    ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/istream:38,
                 from /usr/include/c++/7/sstream:38,
                 from /usr/include/c++/7/complex:45,
                 from /usr/include/c++/7/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/bits/stl_iterator.h:1191:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator-(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1191:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:84: note:   'std::complex<long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                                                    ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/complex:356:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const std::complex<_Tp>&)
     operator-(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/7/complex:356:5: note:   template argument deduction/substitution failed:
fangorn.cpp:101:84: note:   mismatched types 'const std::complex<_Tp>' and 'int'
                     if(cross(tree[y]-tree[x],g-x) != cross(tree[y]-tree[x],camp[i]-x)) {
                                                                                    ^
In file included from /usr/include/c++/7/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
                 from fangorn.cpp:1:
/usr/include/c++/7/complex:365:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const _Tp&)
     operator-(const complex<_Tp>& __x, const _Tp& __y)
     ^~~~~~~~
/usr/include/c++/7/complex:365:5: note:   template a