Submission #219611

#	Time	Username	Problem	Language	Result	Execution time	Memory
219611		summitwei	Boxes with souvenirs (IOI15_boxes)	C++17	100 / 100	582 ms	285176 KiB

boxes

#include <bits/stdc++.h>
#include <boxes.h>
using namespace std;
typedef vector<int> vi;
typedef vector<pair<int, int> > vpii;
typedef pair<int, int> pii;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<double, double> pdd;
typedef vector<ll> vll;
#define INF 1000000000000000000LL
#define MOD 1000000007LL
#define EPSILON 0.00001
#define f first
#define s second
#define pb push_back
#define mp make_pair

#define FOR(i, a, b) for (int i=(a); i<=(signed)(b); i++)
#define F0R(i, a) for (int i=0; i<(signed)(a); i++)
#define RFOR(i, a, b) for (int i=(a); i >= b; i--)

#define MN 10000005
int n, k; ll l;
ll d[MN];
ll ps[MN];
ll rps[MN];

ll delivery(int N, int K, int L, int positions[]){
    n = N; k = K; l = (ll)L;
    F0R(i, n) d[i] = positions[i];
    F0R(i, n){
        ps[i] = d[i]*2;
        if(i >= k){
            ps[i] += ps[i-k];
        }
    }
    RFOR(i, n-1, 0){
        rps[i] = (l-d[i])*2;
        if(i+k < n){
            rps[i] += rps[i+k];
        }
    }
    ll ans = INF;
    F0R(i, n-1){
        ans = min(ans, ps[i]+rps[i+1]);
    }
    ans = min(ans, min(rps[0], ps[n-1]));
    if(k >= n) ans = min(ans, l);
    else{
        F0R(i, n-k+1){
            int lf = i-1, rt = i+k;
            ll res = l+(lf<0?0:ps[lf])+(rt>=n?0:rps[rt]);
            ans = min(ans, res);
        }
    }
    return ans;
}

/*int main(){
    //ios_base::sync_with_stdio(false);
    //cin.tie(0);

    int N, K, L;
    cin >> N >> K >> L;
    int pos[N];
    F0R(i, N) cin >> pos[i];
    cout << delivery(N, K, L, pos) << "\n";
    
    return 0;
}*/

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