oj.uz

Submission #880659

# Submission time Handle Problem Language Result Execution time Memory
880659 2023-11-29T19:41:03 Z LucaIlie Jail (JOI22_jail) C++17
0 / 100
 3 ms 8540 KB 
#include <bits/stdc++.h>

using namespace std;

struct prisoner {
    int b, w;
};

const int MAX_N = 1.2e5;
const int MAX_M = MAX_N;
int parent[MAX_N + 1], depth[MAX_N + 1], bedroom[MAX_N + 1], workroom[MAX_N + 1], in[MAX_N + 1];
vector<int> edges[MAX_N + 1], g[MAX_M + 1];
prisoner prisoners[MAX_M + 1];

void dfs( int u, int p ) {
    depth[u] = depth[p] + 1;
    parent[u] = p;
    for ( int v: edges[u] ) {
        if ( v == p )
            continue;
        dfs( v, u );
    }
}

int main() {
    int t;

    cin >> t;
    while ( t-- ) {
        int n, m;

        cin >> n;
        for ( int v = 1; v <= n; v++ ) {
            edges[v].clear();
            workroom[v] = 0;
            bedroom[v] = 0;
        }
        for ( int i = 0; i < n - 1; i++ ) {
            int u, v;
            cin >> u >> v;
            edges[u].push_back( v );
            edges[v].push_back( u );
        }
        cin >> m;
        for ( int i = 1; i <= m; i++ ) {
            g[i].clear();
            in[i] = 0;
        }
        for ( int i = 1; i <= m; i++ )
            cin >> prisoners[i].b >> prisoners[i].w;

        dfs( 1, 0 );

        for ( int i = 1; i <= m; i++ ) {
            bedroom[prisoners[i].b] = i;
            workroom[prisoners[i].w] = i;
        }
        for ( int i = 1; i <= m; i++ ) {
            int u = prisoners[i].b, v = prisoners[i].w;

            if ( depth[u] < depth[v] )
                swap( u, v );

            vector <int> b, w;
            while ( depth[u] > depth[v] ) {
                if ( workroom[u] != 0 )
                    w.push_back( workroom[u] );
                if ( bedroom[u] != 0 )
                    b.push_back( workroom[u] );
                u = parent[u];
            }

            while ( u != v ) {
                if ( workroom[u] != 0 )
                    w.push_back( workroom[u] );
                if ( bedroom[u] != 0 )
                    b.push_back( workroom[u] );
                if ( workroom[v] != 0 )
                    w.push_back( workroom[v] );
                if ( bedroom[v] != 0 )
                    b.push_back( workroom[v] );
                u = parent[u];
                v = parent[v];
            }

            for ( int j: b ) {
                if ( i == j )
                    continue;
                g[j].push_back( i );
                in[i]++;
            }
            for ( int j: w ) {
                if ( i == j )
                    continue;
                g[i].push_back( j );
                in[j]++;
            }
        }

        queue<int> q;
        for ( int i = 1; i <= m; i++ ) {
            if ( in[i] == 0 )
                q.push( i );
        }
        int pasi = 0;
        while ( !q.empty() ) {
            int u = q.front();
            q.pop();
            pasi++;

            for ( int v: g[u] ) {
                in[v]--;
                if ( in[v] == 0 )
                    q.push( v );
            }
        }

        cout << (pasi == m ? "Yes\n" : "No\n");
    }

    return 0;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Incorrect 2 ms 8540 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Incorrect 3 ms 8540 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Incorrect 3 ms 8540 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Incorrect 3 ms 8540 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Incorrect 3 ms 8540 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Incorrect 1 ms 8540 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Incorrect 2 ms 8540 KB Output isn't correct
3 Halted 0 ms 0 KB -