Submission #898786

#	Time	Username	Problem	Language	Result	Execution time	Memory
898786		vjudge1	Valley (BOI19_valley)	C++17	0 / 100	274 ms	21184 KiB

valley

#include <bits/stdc++.h>

using namespace std;

#define ll long long int
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define all(x) x.begin(), x.end()
#define u_map unordered_map
const int maxn = 1e5 + 5, mod = 1e9 + 7;

vector<pii> adj[maxn], edg;
bool sho[maxn];
map<pii, int> va;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n, s, q, e;
    cin >> n >> s >> q >> e;
    for (int i = 1; i < n; i++) {
    	int u, v, w;
    	cin >> u >> v >> w;
    	adj[u].pb({w, v});
    	adj[v].pb({w, u});
    	va[{u, v}] = w;
    	va[{v, u}] = w;
    	edg.pb({u, v});
    }
    for (int i = 1; i <= s; i++) {
    	int x;
    	cin >> x;
		sho[x] = 1;    	
    }
    while (q--) {
    	int l, r;
    	cin >> l >> r;
    	if ((r <= l and e <= l) or (r > l and e > l)) {
    		cout << "escaped" << endl;
    		continue;
    	}
    	int ans1 = 0, ans2 = 0;
    	bool is1 = false, is2 = false;
    	for (int i = r; i >= max(1, l + 1); i--) {
    		if (sho[i]) {
    			is1 = true;
    			break;
    		}
    		ans1 += va[{i, i - 1}];
    	}
    	for (int i = r; i <= min({n, l}); i++) {
    		if (sho[i]) {
    			is2 = true;
    			break;
    		}
    		ans2 += va[{i, i + 1}];
    	}
    	if (!(is1 or is2)) {
    		cout << "oo" << endl;
    	} else {
    		cout << min(((is1 ^ 1) * mod) + ans1, ((is2 ^ 1) * mod) + ans2) << endl;
    	}
    }
    return 0;
}

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