oj.uz

Submission #1091655

# Submission time Handle Problem Language Result Execution time Memory
1091655 2024-09-21T17:23:17 Z raphaelp Sightseeing (NOI14_sightseeing) C++14
15 / 25
 2248 ms 111628 KB 
#include <bits/stdc++.h>
using namespace std;

vector<int> p;
int find(int x) { return (p[x] == x) ? x : p[x] = find(p[x]); }
int main()
{
    int N, M, Q;
    cin >> N >> M >> Q;
    vector<vector<pair<int, int>>> buckets(1000010);
    for (int i = 0; i < M; i++)
    {
        int a, b, c;
        cin >> a >> b >> c;
        a--, b--;
        buckets[c].push_back({a, b});
    }
    p.assign(N, 0);
    for (int i = 0; i < N; i++)
        p[i] = i;
    vector<int> dist(N);
    vector<vector<int>> contains(N);
    for (int i = 0; i < N; i++)
        contains[i].push_back(i);
    for (int i = 1000000; i >= 0; i--)
    {
        for (int j = 0; j < buckets[i].size(); j++)
        {
            int x = find(buckets[i][j].first), y = find(buckets[i][j].second);
            if (x == y)
                continue;
            if (contains[x].size() > contains[y].size())
                swap(x, y);
            if (find(0) == x)
                swap(x, y);
            p[x] = y;
            if (M > 2500000)
                continue;
            for (auto val : contains[x])
            {
                if (y == find(0))
                    dist[val] = i;
                contains[y].push_back(val);
            }
        }
    }

    for (int i = 0; i < Q; i++)
    {
        int x;
        cin >> x;
        cout << dist[x - 1] << '\n';
    }
}

Compilation message

sightseeing.cpp: In function 'int main()':
sightseeing.cpp:27:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         for (int j = 0; j < buckets[i].size(); j++)
      |                         ~~^~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23896 KB Output is correct
2 Correct 11 ms 23900 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 24036 KB Output is correct
2 Correct 12 ms 23900 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 28620 KB Output is correct
2 Correct 46 ms 27984 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2248 ms 111628 KB Output isn't correct
2 Halted 0 ms 0 KB -