Submission #430929

#	Time	Username	Problem	Language	Result	Execution time	Memory
430929		Emin2004	Boxes with souvenirs (IOI15_boxes)	C++14	20 / 100	4 ms	4940 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define pii pair <int, int>
#define pb push_back
#define F first
#define S second
#define ll long long
#define io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define M_PI 3.14159265358979323846

const int N = 200005;
const int mod = 1e9 + 7;

vector<int> a[N];
int used[N], m, o, z;
ll ans = 0, res = LONG_MAX;

void DFS(int node, int rem, int vis){
    used[node] = 1;
    ll cur = ans;
    if(vis == z){
        ans += min(node, m - node);
        res = min(res, ans);
    }
    else{
        ans += min(node, m - node);
        if(node != m) DFS(m, o, vis);
        if(rem == 0) {
            ans = cur;
            used[node] = 0;
            return;
        }
        for(int i : a[node]){
            if(!used[i]){
                ans = cur + min(abs(node - i), m - abs(node - i));
                DFS(i, rem - 1, vis + 1);
            }
        }
    }
    ans = cur;
    used[node] = 0;
}

long long delivery(int n, int k, int l, int p[]) {
    if(k == 1){
        ll ans = 0;
        for(int i = 0; i < n; i++){
            ans += min(p[i], l - p[i]);
        }
        return ans * 2;
    }
    if(k == n){
        ll ans = min(l, (min(p[n - 1] * 2, (l - p[0]) * 2)));
        for(int i = 1; i < n; i++){
            ll cur = (p[i - 1] * 2 + (l - p[i]) * 2);
            ans = min(ans, cur);
        }
        return ans;
    }
    m = l;
    o = k;
    z = n;
    for(int i = 0; i < n; i++){
        a[m].pb(p[i]);
        for(int j = i + 1; j < n; j++){
            int x = p[i];
            int y = p[j];
            a[x].pb(y);
            a[y].pb(x);
        }
    }
    DFS(m, k, 0);
    return res;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:49:12: warning: declaration of 'ans' shadows a global declaration [-Wshadow]
   49 |         ll ans = 0;
      |            ^~~
boxes.cpp:19:4: note: shadowed declaration is here
   19 | ll ans = 0, res = LONG_MAX;
      |    ^~~
boxes.cpp:56:12: warning: declaration of 'ans' shadows a global declaration [-Wshadow]
   56 |         ll ans = min(l, (min(p[n - 1] * 2, (l - p[0]) * 2)));
      |            ^~~
boxes.cpp:19:4: note: shadowed declaration is here
   19 | ll ans = 0, res = LONG_MAX;
      |    ^~~

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