Cod sursa(job #1490413)

Utilizator akaprosAna Kapros akapros Data 23 septembrie 2015 14:55:33
Problema Garaj Scor 50
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.48 kb
#include <fstream>
#include <cstring>
#include <algorithm>
#include <string>
#define ll int
#define maxN 100002
using namespace std;
int n, sol, x;
ll m;
struct elem
{
    ll c;
    ll t;
}v[maxN];
string buffer;
string::iterator buffer_it;
ifstream fin("garaj.in");
ofstream fout("garaj.out");
int cmp(const elem a, const elem b)
{
    return a.c * ((x ) / a.t) > b.c * ((x) / b.t);
}
void r(ll &x)
{
    for ( ; *buffer_it>'9' || *buffer_it<'0'; ++buffer_it ) ;
    for ( x= 0; *buffer_it<='9' && *buffer_it>='0'; ++buffer_it ) {
        x= x*10+*buffer_it-'0';
    }
}
void read()
{
    int i;
    getline( fin, buffer, (char)0 ) ;
    buffer_it= buffer.begin();
    r(n); r(m);
    for (i = 1; i <= n; ++ i)
        r(v[i].c), r(v[i].t),
             v[i].t *= 2;
}
int ok(ll x)
{
    int i;
    ll sum = 0LL;
    for (i = 1; i <= n; ++ i)
    {
        sum += v[i].c * ((x ) / v[i].t);
        if (sum >= m)
            break;
    }
    return sum >= m;
}
int bs()
{
    ll p = 1 << 30, i = p;

    while (p)
    {
        if (i - p >= 0 && ok(i - p))
            i -= p;
        p /= 2;
    }
    return i;
}
void write()
{
    int sum = 0, i;
    x = bs();
    fout<< x <<" ";
    sort(v + 1, v + n + 1, cmp);
    for (i = 1; i <= n; ++ i)
    {
        sum += v[i].c * ((x) / v[i].t);
        ++ sol;
        if (sum >= m)
            break;
    }
    fout << sol;
}
int main()
{
    read();
    write();
    return 0;
}