Submission #1109463

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109463		Ludissey	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	1 ms	552 KiB

bridge

#include <bits/stdc++.h>
#define int long long
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()

using namespace std;

int l(pair<int,pair<int,int>> a) {
    return (int)a.second.first;
}
int r(pair<int,pair<int,int>> a) {
    return (int)a.second.second;
}
int v(pair<int,pair<int,int>> a) {
    return (int)a.first;
}
signed main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    int n,k; cin >> k >> n;
    int sum=0;
    vector<pair<int,pair<int,int>>> a;
    for (int i = 0; i < n; i++){
        char p,q; int s,t; cin >> p >> s >> q >> t;
        if(s>t) swap(s,t);
        if(p!=q) {
            a.push_back({s+t,{2*s,2*t}});
            sum++;
        }
        sum+=abs(s-t);
    }
    n=sz(a);
    sort(all(a));
    int mn=1e18;
    if(k==1){
        int md=(n-1)/2;
        mn=0;
        for (int j = 0; j < n; j++)
        {
            mn+=max(0LL,max(l(a[j])-v(a[md]),v(a[md])-r(a[j])));
        }
    }else{
        for (int i = 0; i <= n; i++)
        {
            int sm=0;
            int md=(i-1)/2;
            for (int j = 0; j < i; j++)
            {
                sm+=max(0LL,max(l(a[j])-v(a[md]),v(a[md])-r(a[j])));
            }
            md=(i+n-1)/2;
            for (int j = 0; j < i; j++)
            {
                sm+=max(0LL,max(l(a[j])-v(a[md]),v(a[md])-r(a[j])));
            }
            mn=min(mn,sm);
        }
    }
    cout << sum+mn << "\n";
    return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37