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답안 #1111556

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1111556 2024-11-12T09:34:49 Z itslq Drivers (BOI24_drivers) C++17
11 / 100
 2000 ms 81680 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long

const int MAX = 200005, LOG = 21;

vector<int> depth(MAX, 0), ufdspa(MAX), ufdsrk(MAX);
vector<vector<pair<int, int>>> twok(LOG, vector<pair<int, int>>(MAX, make_pair(-1, INT_MAX)));
vector<vector<pair<int, int>>> adjList(MAX), MSTList(MAX);

int root(int n) {
    if (ufdspa[n] == n) return n;
    return ufdspa[n] = root(ufdspa[n]);
}

void merge(int a, int b) {
    int x = root(a), y = root(b);
    if (x == y) return;
    if (ufdsrk[x] > ufdsrk[y]) ufdspa[y] = x;
    else if (ufdsrk[x] < ufdsrk[y]) ufdspa[x] = y;
    else {
        ufdspa[x] = y;
        ufdsrk[y]++;
    }
}

void rec(int n, int p = -1) {
    for (pair<int, int> adj: MSTList[n]) {
        if (adj.second == p) continue;
        //cout << adj.first << "***\n";
        twok[0][adj.second] = make_pair(n, adj.first);
        depth[adj.second] = depth[n] + 1;
        rec(adj.second, n);
    }
}

pair<int, int> kpar(int x, int k){
    //cout << x << '-' << k << endl;
    int L = 0;
	for (int j = 0; j < LOG; j++){
		if (x == -1) break;
		if (k & (1 << j)) {
            L = max(L, twok[j][x].second);
            x = twok[j][x].first;
		}
	}
	//cout << "kpar returns " << x << " " << L << endl;
	return make_pair(x, L);
}

int ans(int a, int b) {
    if (root(a) != root(b)) return INT_MAX;
    if (depth[a] < depth[b]) swap(a, b);

    pair<int, int> p = kpar(a, depth[a] - depth[b]);
    //cout << depth[a] - depth[b] << "th ";
    a = p.first;
    //cout << "PARENT IS: " << a << '\n';
    int L = p.second;

    if (a == b) return L;

    for (int k = LOG - 1; k >= 0; k--){
        if (twok[k][a].first != twok[k][b].first){
            L = max(L, max(twok[k][a].second, twok[k][b].second));
            a = twok[k][a].first; b = twok[k][b].first;
        }
    }

    return max(L, max(twok[0][a].second, twok[0][b].second));
}

signed main() {
    int N, M, U, X, Y, T, A, B, P;
    pair<int, pair<int, int>> curr;
    cin >> N >> M >> U;
    vector<bool> vis(N);
    for (int i = 0; i < M; i++) {
        cin >> X >> Y >> T;
        --X; --Y;
        adjList[X].emplace_back(T, Y);
        adjList[Y].emplace_back(T, X);
    }
    for (int i = 0; i < N; i++) ufdspa[i] = i;

    priority_queue<pair<int, pair<int, int>>, vector<pair<int, pair<int, int>>>, greater<pair<int, pair<int, int>>>> pq;
    for (int k = 0; k < N; k++) {
        if (vis[k]) continue;

        pq = priority_queue<pair<int, pair<int, int>>, vector<pair<int, pair<int, int>>>, greater<pair<int, pair<int, int>>>>();
        pq.emplace(0, make_pair(k, k));
        while (!pq.empty()) {
            curr = pq.top();
            pq.pop();

            if (vis[curr.second.second]) continue;
            vis[curr.second.second] = 1;

            if (curr.second.first != k || curr.second.second != k) {
                MSTList[curr.second.first].emplace_back(curr.first, curr.second.second);
                MSTList[curr.second.second].emplace_back(curr.first, curr.second.first);
                merge(curr.second.first, curr.second.second);
            }

            for (pair<int, int> adj: adjList[curr.second.second]) {
                if (vis[adj.second]) continue;
                pq.emplace(adj.first, make_pair(curr.second.second, adj.second));
            }
        }

        rec(k);
    }

    while (U--) {
        cin >> A >> B >> P;
        --A; --B;
        vector<bool> v(N);
        queue<int> q;

        q.push(A);
        v[A] = 1;
        bool f = 0;
        while (!q.empty()) {
            if (q.front() == B) {
                cout << "TAIP\n";
                f = 1;
                break;
            }
            for (pair<int, int> adj: MSTList[q.front()]) {
                if (v[adj.second] || adj.first > P) continue;
                q.push(adj.second);
                v[adj.second] = 1;
            }
            q.pop();
        }

        if (!f) cout << "NE\n";

        //cout << (ans(--A, --B)) << endl;
        //cout << (ans(--A, --B) > P ? "NE" : "TAIP") << endl;
    }
    //for (int i = 0; i < N; i++) cout << pa[i] << " ";
}
/*
8 7 10
1 2 3
1 3 5
1 4 4
3 5 2
4 5 3
6 8 4
6 7 1*/

Subtask #1
0.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 80152 KB Output is correct
2 Correct 32 ms 80664 KB Output is correct
3 Correct 28 ms 80664 KB Output is correct
4 Correct 26 ms 80392 KB Output is correct
5 Execution timed out 2071 ms 81296 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 80332 KB Output is correct
2 Correct 38 ms 80144 KB Output is correct
3 Correct 29 ms 80500 KB Output is correct
4 Correct 30 ms 80272 KB Output is correct
5 Correct 40 ms 80400 KB Output is correct
6 Correct 31 ms 80400 KB Output is correct
7 Correct 38 ms 80652 KB Output is correct
8 Correct 38 ms 80656 KB Output is correct
9 Correct 30 ms 80568 KB Output is correct
10 Correct 44 ms 80652 KB Output is correct
11 Correct 47 ms 80736 KB Output is correct
12 Correct 45 ms 81192 KB Output is correct
13 Correct 43 ms 80656 KB Output is correct
14 Correct 41 ms 80472 KB Output is correct
15 Correct 29 ms 80368 KB Output is correct
16 Correct 37 ms 80232 KB Output is correct
17 Correct 35 ms 80176 KB Output is correct
18 Correct 34 ms 80408 KB Output is correct
19 Correct 563 ms 81400 KB Output is correct
20 Correct 31 ms 80384 KB Output is correct
21 Correct 33 ms 80372 KB Output is correct
22 Correct 37 ms 80408 KB Output is correct
23 Correct 33 ms 80400 KB Output is correct
24 Correct 458 ms 81680 KB Output is correct
25 Correct 29 ms 80388 KB Output is correct

Subtask #3
0.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 80152 KB Output is correct
2 Correct 32 ms 80664 KB Output is correct
3 Correct 28 ms 80664 KB Output is correct
4 Correct 26 ms 80392 KB Output is correct
5 Execution timed out 2071 ms 81296 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #4
0.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 80152 KB Output is correct
2 Correct 32 ms 80664 KB Output is correct
3 Correct 28 ms 80664 KB Output is correct
4 Correct 26 ms 80392 KB Output is correct
5 Execution timed out 2071 ms 81296 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #5
0.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 80152 KB Output is correct
2 Correct 32 ms 80664 KB Output is correct
3 Correct 28 ms 80664 KB Output is correct
4 Correct 26 ms 80392 KB Output is correct
5 Execution timed out 2071 ms 81296 KB Time limit exceeded
6 Halted 0 ms 0 KB -