Submission #1324864

#	Time	Username	Problem	Language	Result	Execution time	Memory
1324864		xyz7577	Shortcut (IOI16_shortcut)	C++17	0 / 100	0 ms	332 KiB

shortcut

#include <bits/stdc++.h>
using namespace std;
using int64=long long;
int64 find_shortcut(int n, vector<int> l, vector<int> d, int c) {
    vector<int64> pos(n);
    for (int i=1;i<n;i++) pos[i]=pos[i-1]+l[i-1];
    int64 ans=LLONG_MAX;
    vector<int64> d_plus_pos(n), d_minus_pos(n);
    for (int i=0;i<n; i++) {
        d_plus_pos[i]=d[i]+pos[i];
        d_minus_pos[i]=d[i]-pos[i];
    }
    for (int i=0;i<n;i++) {
        for (int j=i+1; j<n; j++) {
            vector<int64> pre_max_plus(n), pre_max_minus(n), suf_max_plus(n), suf_max_minus(n);
            pre_max_plus[0]=d_plus_pos[0]; pre_max_minus[0] = d_minus_pos[0];
            for (int k=1;k<n; k++) {
                pre_max_plus[k]=max(pre_max_plus[k-1], d_plus_pos[k]);
                pre_max_minus[k]=max(pre_max_minus[k-1], d_minus_pos[k]);
            }
            suf_max_plus[n-1]=d_plus_pos[n-1]; suf_max_minus[n-1]=d_minus_pos[n-1];
            for (int k=n-2; k>=0; k--) {
                suf_max_plus[k]=max(suf_max_plus[k+1], d_plus_pos[k]);
                suf_max_minus[k]=max(suf_max_minus[k+1], d_minus_pos[k]);
            }

            int64 diam=0;
            for (int x=0; x<n;x++) {
                int64 max_normal=LLONG_MIN;
                if (x>0) max_normal=max(max_normal, pre_max_plus[x-1]-pos[x]);
                if (x<n-1) max_normal=max(max_normal, suf_max_minus[x+1]+pos[x]);
                max_normal+=d[x];
                int64 max_via1=max(max(d_plus_pos[j]-pos[j]+d[x]+c,d_minus_pos[j]+pos[j]+d[x]+c),LLONG_MIN);
                int64 max_via2=max(max(d_plus_pos[i]-pos[i]+d[x]+c,d_minus_pos[i]+pos[i]+d[x]+c),LLONG_MIN);
                int64 best=min({max_normal, max_via1, max_via2});
                diam=max(diam, best);
            }
            ans=min(ans, diam);
        }
    }
    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: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3