Submission #885750

#	Time	Username	Problem	Language	Result	Execution time	Memory
885750		cpptowin	Evacuation plan (IZhO18_plan)	C++17	0 / 100	115 ms	50832 KiB

plan

#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define int long long
#define inf 1000000000
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1 << j))
#define onbit(i, j) (i | (1 << j))
#define vi vector<int>
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}
using namespace std;
int n, m, k, Q;
vii ke[maxn];
int d[maxn], arr[maxn];
bool ok[maxn];
namespace sub2
{
    int f[N][N];
    priority_queue<pii, vii, greater<pii>> q;
    void dijkstra()
    {
        while (q.size())
        {
            auto [du, u] = q.top();
            q.pop();
            if (du != d[u])
                continue;
            for (auto [v, w] : ke[u])
            {
                if (d[v] > d[u] + w)
                {
                    d[v] = d[u] + w;
                    q.push({d[v], v});
                }
            }
        }
    }
    struct node
    {
        int du, u;
    };
    bool operator<(node a, node b)
    {
        return a.du > b.du;
    }
    void dij(int i)
    {
        fo(j, 1, n) f[i][j] = -1;
        priority_queue<node> q;
        q.push({f[i][i], i});
        while (q.size())
        {
            auto [du, u] = q.top();
            q.pop();
            if (f[i][u] != du)
                continue;
            for (auto [v, w] : ke[u])
            {
                int val;
                if(f[i][u] == -1) val = d[v];
                else val = min(f[i][u],d[v]);
                if (f[i][v] < val)
                {
                    f[i][v] = val;
                    q.push({d[v], v});
                }
            }
        }
    }
    void solve()
    {
        fo(i, 1, n) d[i] = inf;
        fo(i, 1, k) q.push({0, arr[i]}), d[arr[i]] = 0;
        dijkstra();
        fo(i, 1, n)
        {
            dij(i);
        }
        while (Q--)
        {
            int u, v;
            cin >> u >> v;
            if(d[u] == 0 or d[v] == 0) cout << 0 << "\n";
            else 
            cout << f[u][v] << "\n";
        }
    }
}
namespace sub3
{
    priority_queue<pii, vii, greater<pii>> q;
    int f[maxn];
    void dijkstra()
    {
        while (q.size())
        {
            auto [du, u] = q.top();
            q.pop();
            if (du != d[u])
                continue;
            for (auto [v, w] : ke[u])
            {
                if (d[v] > d[u] + w)
                {
                    d[v] = d[u] + w;
                    q.push({d[v], v});
                }
            }
        }
    }
    struct node
    {
        int du, u;
    };
    bool operator<(node a, node b)
    {
        return a.du > b.du;
    }
    void dij(int i)
    {
        fo(j, 1, n) f[j] = -1;
        priority_queue<node> q;
        q.push({f[i], i});
        while (q.size())
        {
            auto [du, u] = q.top();
            q.pop();
            if (f[u] != du)
                continue;
            for (auto [v, w] : ke[u])
            {
                int val;
                if(f[u] == -1) val = d[v];
                else val = min(f[u],d[v]);
                if (f[v] < val)
                {
                    f[v] = val;
                    q.push({d[v], v});
                }
            }
        }
    }
    void solve()
    {
        fo(i, 1, n) d[i] = inf;
        fo(i, 1, k) q.push({0, arr[i]}), d[arr[i]] = 0;
        dijkstra();
        int u, v;
        cin >> u >> v;
        fo(i, 1, n) f[i] = inf;
        dij(u);
        if(d[u] == 0 or d[v] == 0) cout << 0;
        else 
        cout << f[v];
    }
}
main()
{
#define name "TASK"
    if (fopen(name ".inp", "r"))
    {
        freopen(name ".inp", "r", stdin);
        freopen(name ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> m;
    fo(i, 1, m)
    {
        int u, v, w;
        cin >> u >> v >> w;
        ke[u].pb(v, w);
        ke[v].pb(u, w);
    }
    cin >> k;
    fo(i, 1, k) cin >> arr[i];
    cin >> Q;
    if (m <= 200)
        sub2::solve();
    if (Q == 1)
        sub3::solve();
}

Compilation message (stderr)

plan.cpp:185:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  185 | main()
      | ^~~~
plan.cpp: In function 'int main()':
plan.cpp:190:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  190 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
plan.cpp:191:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  191 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 13
• Subtask 3: 0 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 46