Submission #1020847

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020847		vjudge1	Shortcut (IOI16_shortcut)	C++17	38 / 100	2039 ms	596 KiB

shortcut

#include <bits/stdc++.h>
#define ent '\n'

//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")

typedef long long ll;
using namespace std;
const int maxn = 2e5+12;

ll pref[maxn];
int p[maxn];
int D[maxn];
int n;

long long find_shortcut(int N, vector <int> l, vector <int> d, int c){
    n = N;
    for(int i=1;i<n;i++){
        pref[i] = pref[i-1] + l[i-1];
        p[i] = i;
        p[i-1] = i-1;
        D[i] = d[i], D[i-1] = d[i-1];
    }
    sort(p, p+n, [](int i, int j){
        return D[i] > D[j];
    });
    ll ans = 1e18;
    for(int i=n-1;i>=0;i--){
        for(int j=n-1;j>i;j--){
            int y = p[j], x = p[i];
            if(x > y) swap(x, y);
            ll val = *max_element(d.begin(), d.end()), mn = 0;
            ll mxl = 0, mxr = 0;
            for(int i=0;i<=x;i++) {
                if(i != x) mxl = max(mxl, pref[x] - pref[i] + d[i]);
                val = max(val, pref[i] + d[i] + mn);
                mn = max(mn, d[i] - pref[i]);
            }
            if(val >= ans) continue;
            mn = -pref[y];
            for(int i=y;i<n;i++){
                if(i != y) mxr = max(mxr, pref[i] - pref[y] + d[i]);
                val = max(val, pref[i] + d[i] + mn);
                mn = max(mn, d[i] - pref[i]);
            }
            ll cur = val;
            val = max(val, mxl + mxr + min(pref[y] - pref[x], (ll)c));
            if(val >= ans) continue;
            for(int i=x;i<=y;i++){
                val = max(val, mxl + min(pref[i] - pref[x], pref[y] - pref[i] + c) + d[i]);
                val = max(val, mxr + min(pref[y] - pref[i], pref[i] - pref[x] + c) + d[i]);
                for(int j=i+1;j<=y;j++){
                    val = max(val, min(pref[j] - pref[i], pref[i] - pref[x] + pref[y] - pref[j] + c) + d[i] + d[j]);
                }
                if(val >= ans) break;
            }
            ans = min(ans, val);
        }
    }
    return ans;
}

Compilation message (stderr)

shortcut.cpp: In function 'long long int find_shortcut(int, std::vector<int>, std::vector<int>, int)':
shortcut.cpp:46:16: warning: unused variable 'cur' [-Wunused-variable]
   46 |             ll cur = val;
      |                ^~~

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