Submission #1005778

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005778		a5a7	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	2097 ms	7336 KiB

bridge

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <class T> 
using indexedset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;

int main(){
    int k, n;
    cin >> k >> n;
    vector<pair<ll, ll>> deals;
    ll ans = 0;
    for (int i = 0; i < n; i++){
        char a, b;
        ll c, d;
        cin >> a >> c >> b >> d;
        if (a == b) ans += max(d,c)-min(d,c);
        else deals.push_back({min(c,d), max(c,d)});
    }
    ans += deals.size();
    if (k == 1){
        vector<ll> v;
        for (auto x : deals) v.push_back(x.first), v.push_back(x.second);
        sort(v.begin(), v.end());
        ll med = v[v.size()/2];
        for (ll x : v) ans += abs(x-med);
    }else{
        sort(deals.begin(), deals.end(), [&](auto x, auto y){
            return (x.first+x.second)<(y.first+y.second);
        });
        multiset<ll> fh, fb, lh, lb;
        ll last = 0;
        ll first = 0;
        ll best = 1e9;
        for (int i = 0; i < (int) deals.size(); i++){
            last += deals[i].first + deals[i].second;
            lh.insert(deals[i].first);
            lh.insert(deals[i].second);
        }
        while (lh.size() > lb.size()){
            lb.insert(*lh.begin());
            last -= 2 * (*lh.begin());
            lh.erase(lh.begin());
        }
        best = last;
        for (int i = 0; i < deals.size(); i++){
            first += deals[i].second + deals[i].first;
            fh.insert(deals[i].first);
            fh.insert(deals[i].second);    
            while (fh.size() > fb.size()){
                fb.insert(*fh.begin());
                first -= 2 * (*fh.begin());
                fh.erase(fh.begin());
            }
            if (lh.count(deals[i].first)) lh.erase(lh.find(deals[i].first)), last -= deals[i].first;
            else lb.erase(lb.find(deals[i].first)), last += deals[i].first;
            if (lh.count(deals[i].second)) lh.erase(lh.find(deals[i].second)), last -= deals[i].second;
            else lb.erase(lb.find(deals[i].second)), last += deals[i].second;
            while (lh.size() > lb.size()){
                lb.insert(*lh.begin());
                last -= 2 * (*lh.begin());
                lh.erase(lh.begin());
            }
            while (lh.size() < lb.size()){
                ll number = *--lb.end();
                lh.insert(number);
                last += 2 * number;
                lh.erase(lh.find(number));
            }
            best = min(best, first+last);
        }
        ans += best;
    }
    cout << ans << endl;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:47:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for (int i = 0; i < deals.size(); i++){
      |                         ~~^~~~~~~~~~~~~~

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