답안 #530688

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
530688	2022-02-26T12:30:53 Z	c28dnv9q3	Mixture (BOI20_mixture)	C++17	컴파일 오류	0 ms	0 KB

Mixture

#include <iostream>
#include <bits/stdc++.h>
#define lli __int128_t
#define RBit _Rb_tree_iterator<pair<const pair<lli, lli>, int>>

using namespace std;

lli a, b, c;

lli ab(lli n) {
    return n < 0 ? -n : n;
}

lli ggt(lli x, lli y) {
    return x == 0 ? y : ggt(y % x, x);
}

pair<lli, lli> toPoint(lli tX, lli tY, lli tZ) {
    //cout << tX << " " << tY << " " << tZ << "\n";
    lli x, y;
    if (a != 0) {
        x = tY * a - tX * b; y = tZ * a - tX * c;
    } else if (b != 0) {
        x = tX * b - tY * a; y = tZ * b - tY * c;
    } else {
        x = tX * c - tZ * a; y = tY * c - tZ * b;
    }
    lli d = ab(ggt(x, y));
    //cout << x << " " << y << "\n";
    if (d == 0) return {0, 0};
    x /= d;
    y /= d;
    return {x, y};
}

pair<lli, lli> inverse(pair<lli, lli> p) {
    return {- p.first, - p.second};
}

struct cmp {
    bool operator()(const pair<lli, lli>& pA, const pair<lli, lli>& pB) const {
        if (pA.first >= 0 && pB.first < 0) return true;
        if (pB.first >= 0 && pA.first < 0) return false;
        if (pA.second * pB.first == pB.second * pA.first && pA.first == 0 && pB.first == 0) return pA.second > pB.second;
        return pA.second * pB.first > pB.second * pA.first;
    }
};

ostream& operator << (ostream& io, const pair<lli, lli>& p) {
    io << p.first << " " << p.second;
    return io;
}

ostream& operator << (ostream& io, const pair<pair<lli, lli>, int>& p) {
    io << p.first << " x " << p.second << "\n";
    return io;
}

bool okay(map<pair<lli, lli>, int, cmp> circle) {
    if (circle.empty()) return false;
    RBit it = circle.begin();
    RBit inv = circle.upper_bound(inverse((*it).first));
    if (circle.end() == inv) inv = circle.begin();
    RBit invinv = circle.upper_bound(inverse((*inv).first));
    if (circle.end() == invinv) invinv = circle.begin();
    return it != inv && inv != invinv;
}

int main() {
    cin >> a >> b >> c;

    int n = 0, d = 0;
    pair<lli, lli> p, inv;
    vector<pair<lli, lli>> regal;
    map<pair<lli, lli>, int, cmp> circle;

    int q;
    cin >> q;

    string inst;
    int pos;

    lli x, y, z;

    for (int i = 0; i < q; ++i) {
        //cout << i << "\n";

        cin >> inst;

        if (inst == "A") {
            cin >> x >> y >> z;
            p = toPoint(x, y, z);
            inv = inverse(p);

            /*
            cout << "\n";
            cout << x << " " << y << " " << z << "\n";
            cout << p;
            cout << "\n\n";
             */

            /*
            cout << "adding\n";
            cout << p;
            cout << "\n";
             */

            if ((*circle.find(p)).first == p && (*circle.find(inv)).first == inv) d--;

            regal.push_back(p);
            if (p.first == 0 && p.second == 0) n++; else {
                circle[p]++;
            }

            /*
            cout << "dtest\n";
            cout << *circle.end();
            cout << circle[p] << "\n";
            cout << *circle.find(p);
            cout << p << "\n";
            cout << *circle.find(inv);
            cout << inv << "\n";
             */

            if ((*circle.find(p)).first == p && (*circle.find(inv)).first == inv) d++;
        }

        if (inst == "R") {
            cin >> pos;
            p = regal[pos - 1];
            inv = inverse(p);

            if ((*circle.find(p)).first == p && (*circle.find(inv)).first == inv) d--;

            if (p.first == 0 && p.second == 0) n--; else {
                circle[p]--;
                if (circle[p] == 0) circle.erase(p);
            }

            if ((*circle.find(p)).first == p && (*circle.find(inv)).first == inv) d++;
        }

        /*
        cout << "0 0 x " << n << "\n";
        for (pair<pair<lli, lli>, int> j: circle) cout << j;
        cout << "\n";
         */

        if (n > 0) {
            cout << 1;
        } else {
            if (d > 0) {
                cout << 2;
            } else {
                if (okay(circle)) {
                    cout << 3;
                } else {
                    cout << 0;
                }
            }
        }
        cout << "\n";
    }
}

Compilation message

Mixture.cpp: In function 'std::ostream& operator<<(std::ostream&, const std::pair<__int128, __int128>&)':
Mixture.cpp:50:8: error: ambiguous overload for 'operator<<' (operand types are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'const __int128')
   50 |     io << p.first << " " << p.second;
      |     ~~ ^~ ~~~~~~~
      |     |       |
      |     |       const __int128
      |     std::ostream {aka std::basic_ostream<char>}
In file included from /usr/include/c++/10/iostream:39,
                 from Mixture.cpp:1:
/usr/include/c++/10/ostream:166:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  166 |       operator<<(long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:170:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  170 |       operator<<(unsigned long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:174:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  174 |       operator<<(bool __n)
      |       ^~~~~~~~
In file included from /usr/include/c++/10/ostream:784,
                 from /usr/include/c++/10/iostream:39,
                 from Mixture.cpp:1:
/usr/include/c++/10/bits/ostream.tcc:91:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char; _Traits = std::char_traits<char>]'
   91 |     basic_ostream<_CharT, _Traits>::
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/10/iostream:39,
                 from Mixture.cpp:1:
/usr/include/c++/10/ostream:181:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  181 |       operator<<(unsigned short __n)
      |       ^~~~~~~~
In file included from /usr/include/c++/10/ostream:784,
                 from /usr/include/c++/10/iostream:39,
                 from Mixture.cpp:1:
/usr/include/c++/10/bits/ostream.tcc:105:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char; _Traits = std::char_traits<char>]'
  105 |     basic_ostream<_CharT, _Traits>::
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/10/iostream:39,
                 from Mixture.cpp:1:
/usr/include/c++/10/ostream:192:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  192 |       operator<<(unsigned int __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:201:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  201 |       operator<<(long long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:205:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  205 |       operator<<(unsigned long long __n)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:220:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  220 |       operator<<(double __f)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:224:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  224 |       operator<<(float __f)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:232:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]'
  232 |       operator<<(long double __f)
      |       ^~~~~~~~
/usr/include/c++/10/ostream:511:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char) [with _CharT = char; _Traits = std::char_traits<char>]'
  511 |     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:517:5: note: candidate: 'std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char) [with _Traits = std::char_traits<char>]'
  517 |     operator<<(basic_ostream<char, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:523:5: note: candidate: 'std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char) [with _Traits = std::char_traits<char>]'
  523 |     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
      |     ^~~~~~~~
/usr/include/c++/10/ostream:528:5: note: candidate: 'std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char) [with _Traits = std::char_traits<char>]'
  528 |     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
      |     ^~~~~~~~
Mixture.cpp: In function 'int main()':
Mixture.cpp:70:9: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and '__int128')
   70 |     cin >> a >> b >> c;
      |     ~~~ ^~ ~
      |     |      |
      |     |      __int128
      |     std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:120:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  120 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/10/istream:120:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: invalid conversion from '__int128' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   70 |     cin >> a >> b >> c;
      |            ^
      |            |
      |            __int128
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:124:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]' (near match)
  124 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/10/istream:124:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: invalid conversion from '__int128' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'} [-fpermissive]
   70 |     cin >> a >> b >> c;
      |            ^
      |            |
      |            __int128
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:131:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  131 |       operator>>(ios_base& (*__pf)(ios_base&))
      |       ^~~~~~~~
/usr/include/c++/10/istream:131:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: invalid conversion from '__int128' to 'std::ios_base& (*)(std::ios_base&)' [-fpermissive]
   70 |     cin >> a >> b >> c;
      |            ^
      |            |
      |            __int128
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:168:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  168 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:168:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'bool&' to an rvalue of type 'bool'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:172:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  172 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/10/istream:172:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'short int&' to an rvalue of type 'short int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:175:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  175 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:175:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to an rvalue of type 'short unsigned int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:179:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  179 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/10/istream:179:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:182:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  182 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:182:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'unsigned int&' to an rvalue of type 'unsigned int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:186:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  186 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:186:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'long int&' to an rvalue of type 'long int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:190:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  190 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:190:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to an rvalue of type 'long unsigned int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:195:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  195 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:195:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'long long int&' to an rvalue of type 'long long int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/10/istream:199:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to an rvalue of type 'long long unsigned int'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:214:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  214 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/10/istream:214:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'float&' to an rvalue of type 'float'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:218:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  218 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/10/istream:218:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'double&' to an rvalue of type 'double'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:222:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  222 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/10/istream:222:7: note:   conversion of argument 1 would be ill-formed:
Mixture.cpp:70:12: error: cannot bind non-const lvalue reference of type 'long double&' to an rvalue of type 'long double'
   70 |     cin >> a >> b >> c;
      |            ^
In file included from /usr/include/c++/10/iostream:40,
                 from Mixture.cpp:1:
/usr/include/c++/10/istream:235:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>]' (near match)
  235 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/10/istream:235:7: note:   conver