Submission #1266292

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266292		gustavo_d	Shortcut (IOI16_shortcut)	C++20	31 / 100	2095 ms	444 KiB

shortcut

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

typedef long long ll;

const int MAXN = 3000;
const ll INF = 1e18;

int n;
ll pf[MAXN], sf[MAXN], pos[MAXN], branch[MAXN];

ll find_shortcut(int N, vector<int> l, vector<int> d, int c) {
    n = N;
    
    ll ans = INF;
    for (int i=0; i<n; i++) {
        for (int j=i+1; j<n; j++) {
            ll res = 0;
            pf[0] = d[0];
            for (int k=0; k<i; k++) {
                pf[k+1] = max(pf[k] + l[k], (ll)d[k+1]);
            }
            sf[i] = d[i];
            for (int k=i-1; k>=0; k--) {
                sf[k] = max((ll)d[k], sf[k+1] + l[k]);
            }
            for (int k=0; k<i; k++) {
                res = max(res, pf[k] + sf[k+1] + l[k]);
            }
            branch[i] = pf[i];
            
            pf[j] = d[j];
            for (int k=j; k<n; k++) {
                pf[k+1] = max(pf[k] + l[k], (ll)d[k+1]);
            }
            sf[n-1] = d[n-1];
            for (int k=n-2; k>=j; k--) {
                sf[k] = max((ll)d[k], sf[k+1] + l[k]);
            }
            for (int k=j; k<n-1; k++) {
                res = max(res, pf[k] + sf[k+1] + l[k]);
            }
            branch[j] = sf[j];

            pos[i] = 0;
            for (int k=i+1; k<j; k++) {
                pos[k] = pos[k-1] + l[k-1];
                branch[k] = d[k];
            }
            pos[j] = pos[j-1] + l[j-1];

            // cout << i << ' ' << j << ": ";
            // for (int k=i; k<=j; k++) {
            //     cout << pos[k] << ' ' << branch[k] << ',';
            // }
            // cout << endl;

            for (int a=i; a<=j; a++) {
                for (int b=a+1; b<=j; b++) {
                    res = max(
                        res,
                        min(pos[b] - pos[a], pos[j] + c - (pos[b] - pos[a])) + branch[a] + branch[b]
                    );
                }
            }
            // cout << res << endl;
            ans = min(ans, res);
        }
    }

    return ans;
}

Compilation message (stderr)

shortcut.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
shortcut_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

• Subtask 1: 9 / 9
• Subtask 2: 14 / 14
• Subtask 3: 8 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3