Submission #1089767

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089767		SnowRaven52	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	0 ms	348 KiB

bridge

#include <bits/stdc++.h>

using namespace std;

bool cmp(pair<long long, long long> a, pair<long long, long long> b){
    return a.first + a.second < b.first + b.second;
}

priority_queue<long long> lpq;
priority_queue<long long, vector<long long>, greater<long long>> rpq;
long long lsum, rsum;

void insert(long long x){
    long long median = (lpq.size() ? lpq.top() : 1000000001);
    if(x <= median){
        lpq.push(x);
        lsum += x;;
    } else {
		rpq.push(x);
		rsum += x;
	}
    if(rpq.size() + 1 < lpq.size()){
        long long nxt = lpq.top();
        lpq.pop();
        rpq.push(nxt);
        lsum -= nxt, rsum += nxt;
    } else if(lpq.size() < rpq.size()){
        long long nxt = rpq.top();
        rpq.pop();
        lpq.push(nxt);
        rsum -= nxt, lsum += nxt;
    }
}

long long pref[100001];

int main() {
	// freopen("main.in", "r", stdin);
	// freopen(".out", "w", stdout);
    long long k, n; cin >> k >> n;
    long long sames = 0;
    vector<pair<long long, long long>> v = {{0, 0}};
    for(long long i = 0; i < n; i++){
        char a, b; long long x, y; cin >> a >> b >> x >> y;
        if(a == b) sames += abs(x - y);
        else v.push_back({x, y});
    }
    sort(v.begin(), v.end(), cmp);
    n = v.size() - 1;
    sames += n;
    lsum = 0;
    rsum = 0;
    for(long long i = 1; i <= n; i++){
        insert(v[i].first);
        insert(v[i].second);
        pref[i] = rsum - lsum;
    }
    long long ans = pref[n];
    if(k == 2){
        while(lpq.size()) lpq.pop();
        while(rpq.size()) rpq.pop();
        lsum = 0;
        rsum = 0;

        for(long long i = n; i > 0; i--){
            insert(v[i].first);
            insert(v[i].second);
            ans = min(ans, rsum - lsum + pref[i - 1]);
        }
    }
    cout << sames + ans << endl;
    return 0;
}

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