Submission #1075773

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075773		asdasdqwer	Shortcut (IOI16_shortcut)	C++14	0 / 100	1 ms	348 KiB

shortcut

#include <bits/stdc++.h>
using namespace std;

#include "shortcut.h"

#define ll long long
#define pii array<ll, 2>

ll dijkstra(vector<vector<pii>> &g, int source) {
    int n=(int)g.size();
    vector<ll> dis(n, (int)1e16);
    dis[source]=0;
    priority_queue<pii> pq;
    for (int i=0;i<n;i++) {
        pq.push({-dis[i], i});
    }
    vector<bool> vis(n, false);
    while (!pq.empty()) {
        auto [d, node] = pq.top();pq.pop();
        if (vis[node]) continue;
        vis[node]=true;

        for (auto [ne, we] : g[node]) {
            if (dis[node] + we < dis[ne]) {
                dis[ne] = dis[node] + we;
                pq.push({-dis[ne], ne});
            }
        }
    }

    ll mx =0;
    for (auto &x:dis) mx=max(mx,x);
    return mx;
}

ll diameter(vector<vector<pii>> &g) {
    ll dis = 0;
    for (int i=0;i<(int)g.size();i++) {
        dis = max(dis, dijkstra(g, i));
    }
    return dis;
}

long long find_shortcut(int n, std::vector <int> l, std::vector <int> d, int c) {
    int tmp = n;
    for (int i=0;i<n;i++)if (d[i]) tmp++;
    vector<vector<pii>> g(tmp);
    for (int i=0;i<n-1;i++) {
        g[i].push_back({i+1, (ll)l[i]});
        g[i+1].push_back({i, (ll)l[i]});
    }

    int lst = n;
    for (int i=0;i<n;i++) {
        if (d[i] == 0) continue;
        g[i].push_back({lst, (ll)d[i]});
        g[lst].push_back({i, (ll)d[i]});
        lst++;
    }

    ll mxDis = diameter(g);

    for (int i=0;i<n;i++) {
        for (int j=i+1;j<n;j++) {
            g[i].push_back({j, (ll)c});
            g[j].push_back({i, (ll)c});
            mxDis = min(mxDis, diameter(g));

            g[i].pop_back();
            g[j].pop_back();
        }
    }

    return mxDis;
}

Compilation message (stderr)

shortcut.cpp: In function 'long long int dijkstra(std::vector<std::vector<std::array<long long int, 2> > >&, int)':
shortcut.cpp:19:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   19 |         auto [d, node] = pq.top();pq.pop();
      |              ^
shortcut.cpp:23:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   23 |         for (auto [ne, we] : g[node]) {
      |                   ^

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