AcWing 734. 能量石 （01背包）+（贪心 - 领项交换）

AcWing 734. 能量石

#include
#include
#include
#include

using namespace std;
const int N = 500007;

struct node{
     
    int s, e, l;
    bool operator<(const node &t)const {
     
        return s * t.l < t.s * l;
    }
}a[N];

int f[N];
int n, m, T;

int main(){
     
    
    int cnt = 0;
    
    scanf("%d", &T);
    while(T -- ){
     
        memset(f, 0xcf, sizeof f);
        scanf("%d", &n);
        m = 0;
        for(int i = 1; i <= n; ++ i){
     
            scanf("%d%d%d", &a[i].s, &a[i].e, &a[i].l);
            m += a[i].s; 
        }
        sort(a + 1, a + 1 + n);
        f[0] = 0;
        for(int i = 1; i <= n; ++ i)
            for(int j = m; j >= a[i].s; -- j){
     
                f[j] = max(f[j], f[j - a[i].s] + max(0, a[i].e - (j - a[i].s) * a[i].l));
            }
        int ans = 0;
        
        for(int i = 1; i <= m; ++ i)
        ans = max(ans, f[i]);
        printf("Case #%d: %d\n", ++cnt, ans);
    }
    return 0;
}

例题：国王游戏，耍杂技的牛