Submission #785718

#	Time	Username	Problem	Language	Result	Execution time	Memory
785718		canadavid1	Hiring (IOI09_hiring)	C++14	Compilation error	0 ms	0 KiB

hiring

#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
#define all(x) begin(x),end(x)
#define rep(var,e) for(int var = 0; var < e; var++)

struct Rational
{
    int num;
    int den;
    Rational() {}
    Rational(int n, int d=1) : num(n), den(d) {}
    Rational operator*(Rational other)  {return Rational(num*other.num,den*other.den);}
    Rational inv()                      {return Rational(den,num);}
    Rational operator/(Rational other)  {return *this * (other.inv());}
    Rational operator+(Rational other)  {return Rational(num*other.den + other.num * den,den*other.den);}
    Rational neg()                      {return Rational(-num,den);}
    Rational operator-(Rational other)  {return *this + (other.neg());}
    Rational operator+=(Rational other) {*this = *this + other;return *this;}      
    Rational simplify()
    {
        int a = gcd(num,den);
        if(den < 0) a = -a;
        num /= a;
        den /= a;
        return *this;
    }
    const bool operator<(const Rational& other) const
    {
        return num * other.den < other.num * den;
    }
    const bool operator>(const Rational& other) const
    {
        return other < *this;
    }
};

struct worker
{
    int mincost,skill,num;
    const bool operator<(const worker& other) const
    {
        return skill < other.skill;
    }
};

signed main()
{
    int N,W;
    cin >> N >> W;
    vector<worker> workers(N);
    rep(i,N)
    {
        cin >> workers[i].mincost >> workers[i].skill;
        workers[i].num = i+1;
    } 
    // one of the included workers is paid their minimum
    // for each, add the cheapest workers until can't anymore

    // sort all workers by min_cost
    sort(all(workers));
    vector<int> included_workers;
    Rational p(0);
    rep(i,N) // index in workers
    {
        worker& s = workers[i];
        Rational costperskill = Rational(s.mincost,s.skill).simplify();
        Rational cc = 0;
        vector<int> included;

        for(auto & j : workers)
        {
            Rational pay = costperskill * j.skill;
            if(pay + cc > W) break;
            if(pay < j.mincost) continue;
            included.push_back(j.num);
            cc += pay;
        }
        if (included.size() >  included_workers.size()
         || included.size() == included_workers.size() && cc < p)
        {
            swap(included,included_workers); // O(1) assign, unneccesary
            p = cc;
            continue;
        }
    }
    cout << included_workers.size() << "\n";
    for(auto i : included_workers) cout << i << "\n";
}

Compilation message (stderr)

hiring.cpp: In member function 'Rational Rational::simplify()':
hiring.cpp:22:17: error: 'gcd' was not declared in this scope
   22 |         int a = gcd(num,den);
      |                 ^~~
hiring.cpp: In function 'int main()':
hiring.cpp:80:56: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   80 |          || included.size() == included_workers.size() && cc < p)
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~