[NOIP 2005PJ]采药 随机化贪心

代码

#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

struct Holder{
    int t,v;
}a[100000];

int cmp(Holder a,Holder b){
    double x=(double)a.v/a.t,y=(double)a.v/a.t;
    return x>y;
}

int T,M,ans=0;

int Rand(){
    sort(a+1,a+1+M,cmp);
    for(int i=1;i<=10;i++){
        swap(a[rand()%M+1],a[rand()%M+1]);
    }
}

int Calculate(){
    int t=T,sum=0;
    for(int i=1;i<=M;i++){
        if(t>=a[i].t){
            t-=a[i].t;
            sum+=a[i].v;
        }
    }
    if(ansint main(){
    srand(time(0));
    cin>>T>>M;
    for(int i=1;i<=M;i++){
        cin>>a[i].t>>a[i].v;
    }
    for(int i=1;i<=70000;i++){
        Rand();
        Calculate();
    }   
    cout<