Submission #905063

#	Time	Username	Problem	Language	Result	Execution time	Memory
905063		VMaksimoski008	Boxes with souvenirs (IOI15_boxes)	C++14	35 / 100	160 ms	484 KiB

boxes

#include <bits/stdc++.h>
#include "boxes.h"

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;

void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

ll delivery(int N, int K, int L, int pos[]) {
    if(K == 1) {
        ll ans = 0;

        for(int i=0; i<N; i++)
            ans += 2 * min(pos[i], L - pos[i]);

        return ans;
    }

    if(K == N) {
        set<int> s;
        for(int i=0; i<N; i++) s.insert(pos[i]);
        vector<int> p(all(s));
        
        ll ans = 0;
        int cnt = 0;
        int curr = 0;

        vector<bool> vis(sz(p), 0);

        while(cnt != sz(p)) {
            ll mn = 1e18;
            int pos = 0;

            for(int i=0; i<sz(p); i++) {
                if(vis[i]) continue;
                ll d = abs(p[i] - curr);
                if(L + curr - p[i] < d) d = L + curr - p[i];
                if(d < mn) {
                    mn = d;
                    pos = i;
                }
            }

            vis[pos] = 1;
            ans += mn;
            curr = p[pos];
            cnt++;
        }

        return ans + min(curr, L - curr);
    } 

    if(N <= 10) {
        vector<int> p;
        for(int i=0; i<N; i++) p.push_back(pos[i]);
        sort(all(p));

        ll ans = 1e18;

        do {
            ll res = 0;

            int curr = 0;
            for(int i=0; i<N; i++) {
                ll d = abs(p[i] - curr);
                if(L + curr - p[i] < d) d = L + curr - p[i];
                res += d;
                curr = p[i];
                if(i % K == K - 1) {
                    res += min(curr, L - curr);
                    curr = 0;
                }
            }

            res += min(curr, L - curr);
            ans = min(ans, res);
        } while(next_permutation(all(p)));

        return ans;
    }

    if(N <= 1000) {
        set<int> s;
        for(int i=0; i<N; i++) s.insert(pos[i]);
        vector<int> p(all(s));
        
        ll ans = 0;
        int cnt = 0;
        int curr = 0;

        vector<bool> vis(sz(p), 0);

        while(cnt != sz(p)) {
            ll mn = 1e18;
            int pos = 0;

            for(int i=0; i<sz(p); i++) {
                if(vis[i]) continue;
                ll d = abs(p[i] - curr);
                if(L + curr - p[i] < d) d = L + curr - p[i];
                if(cnt % K == K - 1) d += min(p[i], L - p[i]);
                if(d < mn) {
                    mn = d;
                    pos = i;
                }
            }

            vis[pos] = 1;
            ans += mn;
            curr = p[pos];

            cnt++;
        }

        return ans + min(curr, L - curr);
    }

    return 0;
}

Compilation message (stderr)

boxes.cpp: In function 'll delivery(int, int, int, int*)':
boxes.cpp:54:17: warning: declaration of 'int pos' shadows a parameter [-Wshadow]
   54 |             int pos = 0;
      |                 ^~~
boxes.cpp:31:38: note: shadowed declaration is here
   31 | ll delivery(int N, int K, int L, int pos[]) {
      |                                  ~~~~^~~~~
boxes.cpp:117:17: warning: declaration of 'int pos' shadows a parameter [-Wshadow]
  117 |             int pos = 0;
      |                 ^~~
boxes.cpp:31:38: note: shadowed declaration is here
   31 | ll delivery(int N, int K, int L, int pos[]) {
      |                                  ~~~~^~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30