제출 #432196

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
432196		Monchito	Shortcut (IOI16_shortcut)	C++14	0 / 100	2047 ms	94296 KiB

shortcut

#include "shortcut.h"
#include <queue>
using namespace std;
using ll = long long;

const int MAXN = 2e6;
const ll INF = 1e18;

int N;
vector<int> G[MAXN];
vector<ll> W[MAXN];

ll dijkstra(int x) {
    priority_queue<pair<ll, int>> q;
    vector<ll> dist(N, INF);
    dist[x] = 0;
    q.push(make_pair(-0, x));

    while(!q.empty()) {
        pair<ll, int> p = q.top(); q.pop();
        int u = p.second;

        if(-p.first != dist[u]) continue;

        for(int i=0; i<(int)G[u].size(); i++) {
            int v = G[u][i];
            ll w = W[u][i];

            if(-p.first + w < dist[v]) {
                dist[v] = -p.first + w; 
                q.push(make_pair(-dist[v], v));
            }
        }
    }

    ll ret = -INF;
    for(int i=0; i<N; i++) ret = max(ret, dist[i]); 

    return ret;
}

ll calc() {
    ll ret = -INF;

    for(int i=0; i<N; i++) {
        if(G[i].empty()) break;
        ret = max(ret, dijkstra(i));
    }

    return ret;
}

void create_link(int u, int v, ll w) {
    G[u].push_back(v);
    W[u].push_back(w);
    G[v].push_back(u);
    W[v].push_back(w);
}

ll find_shortcut(int n, vector<int> l, vector<int> d, int c) {
    N = n;

    for(int i=0; i<n-1; i++) 
        create_link(i, i+1, l[i]);

    for(int i=0; i<n; i++) {
        if(d[i] == 0) continue;
        create_link(i, N, d[i]); 
        N++;
    }

    ll ret = calc();

    for(int i=0; i<n; i++) {
        for(int j=i+1; j<n; j++) {
            create_link(i, j, c);        
            ret = min(ret, calc());

            G[i].pop_back();
            W[i].pop_back();
            G[j].pop_back();
            W[j].pop_back();     
        }
    }

    return ret;
}

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