Cod sursa(job #1573235)

Utilizator laurageorgescuLaura Georgescu laurageorgescu Data 19 ianuarie 2016 15:33:24
Problema Garaj Scor 60
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.13 kb
#include<fstream>
#include<algorithm>

using namespace std;

ifstream fin( "garaj.in" ); ofstream fout( "garaj.out" );

typedef long long i64;

const int nmax = 1e5;
const int tmax = 1000;
int n;
i64 m;
i64 s[ nmax + 1 ];
short int t[ nmax + 1 ], c[ nmax + 1 ];

bool check( i64 T ) {
    i64 ans = 0;
    for( int i = 1; i <= n; ++ i ) {
        ans += T / ( 2 * t[ i ] ) * c[ i ];
        if ( ans >= m ) {
            return 1;
        }
    }
    return 0;
}
int main() {
    fin >> n >> m;
    for( int i = 1; i <= n; ++ i ) {
        fin >> c[ i ] >> t[ i ];
    }

    i64 n2, ans = nmax * tmax;
    for( n2 = 1; (n2 << 1) <= ans; n2 <<= 1 ) {
    }

    for( i64 step = n2; step > 0; step >>= 1 ) {
        if ( ans - step >= 0 && check( ans - step ) ) {
            ans -= step;
        }
    }

    for( int i = 1; i <= n; ++ i ) {
        s[ i ] = ans / ( 2 * t[ i ] ) * c[ i ];
    }
    sort( s + 1, s + n + 1 );
    i64 sum, cate;
    sum = 0; cate = 0;
    for( int j = n; j > 0 && sum < m; -- j ) {
        sum += s[ j ];
        ++ cate;
    }

    fout << ans << " " << cate << "\n";
    fin.close();
    fout.close();
    return 0;
}