oj.uz

Submission #1091625

# Submission time Handle Problem Language Result Execution time Memory
1091625 2024-09-21T15:33:23 Z raphaelp Sightseeing (NOI14_sightseeing) C++14
15 / 25
 2474 ms 262144 KB 
#include <bits/stdc++.h>
using namespace std;
class UnionFind
{
private:
    vector<int> p;

public:
    UnionFind(int x)
    {
        p.assign(x, 0);
        for (int i = 0; i < x; i++)
            p[i] = i;
    }
    int find(int x) { return (p[x] == x) ? x : p[x] = find(p[x]); }
    bool merge(int a, int b)
    {
        int x = find(a), y = find(b);
        if (x == y)
            return 0;
        p[x] = y;
        return 1;
    }
};
void dfs(int x, int p, vector<vector<pair<int, int>>> &AR, vector<int> &dist, int cur)
{
    dist[x] = cur;
    for (int i = 0; i < AR[x].size(); i++)
    {
        if (AR[x][i].first == p)
            continue;
        dfs(AR[x][i].first, x, AR, dist, min(cur, AR[x][i].second));
    }
}
int main()
{
    int N, M, Q;
    cin >> N >> M >> Q;
    vector<vector<int>> AR;
    vector<vector<pair<int, int>>> buckets(100010);
    for (int i = 0; i < M; i++)
    {
        int a, b, c;
        cin >> a >> b >> c;
        a--, b--;
        buckets[c].push_back({a, b});
    }
    for (int i = 100000; i >= 0; i--)
    {
        for (int j = 0; j < buckets[i].size(); j++)
        {
            AR.push_back({buckets[i][j].first, buckets[i][j].second, i});
        }
    }
    UnionFind UF(N);
    vector<vector<pair<int, int>>> AR2(N);
    for (int i = 0; i < M; i++)
    {
        if (UF.merge(AR[i][0], AR[i][1]))
        {
            AR2[AR[i][0]].push_back({AR[i][1], AR[i][2]});
            AR2[AR[i][1]].push_back({AR[i][0], AR[i][2]});
        }
    }
    vector<int> dist(N);
    dfs(0, 0, AR2, dist, 1000000);
    for (int i = 0; i < Q; i++)
    {
        int x;
        cin >> x;
        cout << dist[x - 1] << '\n';
    }
}

Compilation message

sightseeing.cpp: In function 'void dfs(int, int, std::vector<std::vector<std::pair<int, int> > >&, std::vector<int>&, int)':
sightseeing.cpp:28:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for (int i = 0; i < AR[x].size(); i++)
      |                     ~~^~~~~~~~~~~~~~
sightseeing.cpp: In function 'int main()':
sightseeing.cpp:50:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         for (int j = 0; j < buckets[i].size(); j++)
      |                         ~~^~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 2 ms 2648 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3160 KB Output is correct
2 Correct 2 ms 2872 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 10132 KB Output is correct
2 Correct 39 ms 8968 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2474 ms 262144 KB Output is correct
2 Runtime error 3 ms 5212 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -