Cod sursa(job #982588)

Utilizator paunmatei7FMI Paun Matei paunmatei7 Data 9 august 2013 14:57:12
Problema Garaj Scor 90
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.16 kb
#include<stdio.h>
#include<algorithm>

#define NMAX 100007
#define x first
#define y second

using namespace std;

pair < int, int > a[NMAX];
int n, Sum, Nr[NMAX], Ans;

inline bool ok(int med){
    int s = 0;
    for(int i = 1; i <= n; ++ i){
        if(med > a[i].y * 2)
            s += (med / (a[i].y * 2)) * a[i].x;
        if(s >= Sum)
            return 1;
    }
    return 0;
}

inline int Caut(int st, int dr){
    int med = 0, last = - 1;
    while(st <= dr){
        med = (st + dr) >> 1;
        if(ok(med) == 1){
            last = med;
            dr = med - 1;
        }
        else
            st = med + 1;
    }
    return last;
}

int main(){
    freopen("garaj.in", "r", stdin);
    freopen("garaj.out", "w", stdout);
    scanf("%d %d", &n, &Sum);
    for(int i = 1; i <= n; ++ i)
        scanf("%d %d", &a[i].x, &a[i].y);
    int T = Caut(1, (1 << 30));
    printf("%d ", T);
    for(int i = 1; i <= n; ++ i)
        Nr[i] = T / (a[i].y * 2) * a[i].x;
    sort(Nr + 1, Nr + n + 1);
    reverse(Nr + 1, Nr + n + 1);
    while(Sum > 0){
        ++ Ans;
        Sum -= Nr[Ans];
    }
    printf("%d", Ans);
}