Submission #1021918

#	Time	Username	Problem	Language	Result	Execution time	Memory
1021918		HishamAlshehri	Valley (BOI19_valley)	C++17	0 / 100	8 ms	604 KiB

valley

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
//using namespace __gnu_pbds;

#define int long long
#define mod 1000000007
#define base 7001
#define base2 757
// #define pi acos(-1)
#define double long double
//#define ordered_set tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update>
//#define ordered_multiset tree<int, null_type, less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>

#pragma GCC optimize("O3,Ofast,unroll-loops")
#pragma GCC target("avx2,sse3,sse4,avx")

constexpr int maxn = 1000001;
const int N = 1 << (int)(ceil(log2(maxn)));

int n, s, q, e;
array<int,2> edge[1001];
bool vis[1001], shop[1001];
vector<pair<int,int>>adj[1001];

int dfs(int i, int a, int b)
{
    vis[i] = 1;
    int mn = INT_MAX;
    for (auto [j, w] : adj[i])
    {
        if ((j == a && i == b) || (j == b && i == a))
            continue;
        if (!vis[j])
            mn = min(dfs(j, a, b) + w, mn);
    }
    if (shop[i])
        return 0;
    return mn;
}

signed main()
{
    cin.tie(0) -> sync_with_stdio(0);
    cin >> n >> s >> q >> e;
    for (int i = 1; i < n; i++)
    {
        int u, v, w;
        cin >> u >> v >> w;
        edge[i] = {u, v};
        adj[u].push_back({v, w});
        adj[v].push_back({u, w});
    }
    for (int i = 0; i < s; i++)
    {
        int u;
        cin >> u;
        shop[u] = 1;
    }
    while (q--)
    {
        memset(vis, 0, sizeof vis);
        int i, r;
        cin >> i >> r;
        int mn = dfs(r, edge[i][0], edge[i][1]);
        if (vis[e]) cout << "escaped\n";
        else if (mn != INT_MAX) cout << mn << "\n";
        else cout << "oo\n";
    }
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 27
• Subtask 3: 0 / 23
• Subtask 4: 0 / 41