Submission #705189

#	Time	Username	Problem	Language	Result	Execution time	Memory
705189		bin9638	Boxes with souvenirs (IOI15_boxes)	C++17	100 / 100	527 ms	232192 KiB

boxes

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define fs first
#define sc second
#define N 10000010
#define pb push_back

ll sum_left[N],sum_right[N];

ll delivery(int n,int k,int l,int a[])
{
    for(int i=1;i<=n;i++)
        if(i<=k)
            sum_left[i]=a[i-1]+min(a[i-1],l-a[i-1]);
                else sum_left[i]=sum_left[i-k]+1ll*a[i-1]+min(a[i-1],l-a[i-1]);
    for(int i=n;i>=1;i--)
        if(i+k-1>=n)
            sum_right[i]=l-a[i-1]+min(a[i-1],l-a[i-1]);
                else sum_right[i]=sum_right[i+k]+1ll*l-a[i-1]+min(a[i-1],l-a[i-1]);
    ll res=min(sum_left[n],sum_right[1]);
    for(int i=1;i<n;i++)
        res=min(res,sum_left[i]+sum_right[i+1]);
    return res;
}

#ifdef SKY
int main()
{
    freopen("A.inp","r",stdin);
    freopen("A.out","w",stdout);
  //  ios::sync_with_stdio(0);
   // cin.tie(NULL);
   // cout.tie(NULL);
    int n,k,l;
    cin>>n>>k>>l;
    int a[n];
    for(int i=0;i<n;i++)
        cin>>a[i];
    cout<<delivery(n,k,l,a);
    return 0;
}
#endif // SKY

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30