Submission #884005

#	Time	Username	Problem	Language	Result	Execution time	Memory
884005		LucaIlie	Jail (JOI22_jail)	C++17	0 / 100	146 ms	173408 KiB

jail

#include <bits/stdc++.h>

using namespace std;

struct prisoner {
    int b, w;
};

const int MAX_N = 1.2e5;
const int MAX_M = MAX_N;
const int MAX_LOG_N = 16;
const int MAX_V = MAX_M + MAX_N * (MAX_LOG_N + 1) + 1;
int parent[MAX_LOG_N + 1][MAX_N + 1], depth[MAX_N + 1], vertP[MAX_M], vertB[MAX_LOG_N + 1][MAX_N + 1], vertW[MAX_LOG_N + 1][MAX_N + 1], in[MAX_V];
vector <int> edges[MAX_N + 1], g[MAX_V];
prisoner prisoners[MAX_M + 1];

void dfs( int u, int p ) {
    depth[u] = depth[p] + 1;
    parent[0][u] = p;
    for ( int v: edges[u] ) {
        if ( v == p )
            continue;
        dfs( v, u );
    }
}

int findParent( int v, int d ) {
    if ( d < 0 )
        return 0;

    for ( int l = MAX_LOG_N; l >= 0; l-- ) {
        if ( d >= (1 << l) ) {
            d -= (1 << l);
            v = parent[l][v];
        }
    }

    return v;
}

int main() {
    int t;

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

        cin >> n;
        for ( int v = 1; v <= n; v++ )
            edges[v].clear();
        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++ )
            cin >> prisoners[i].b >> prisoners[i].w;

        dfs( 1, 0 );

        int V = 1;
        for ( int i = 1; i <= m; i++ )
            vertP[i] = V++;
        for ( int l = 0; l <= log2( n ); l++ ) {
            for ( int v = 1; v <= n; v++ ) {
                vertB[l][v] = V++;
                vertW[l][v] = V++;
            }
        }
        for ( int v = 0; v < V; v++ )
            g[v].clear(), in[v] = 0;

        for ( int l = 1; l <= log2( n ); l++ ) {
            for ( int v = 1; v <= n; v++ ) {
                parent[l][v] = parent[l - 1][parent[l - 1][v]];
                g[vertB[l - 1][v]].push_back( vertB[l][v] );
                g[vertB[l - 1][parent[l - 1][v]]].push_back( vertB[l][v] );
                g[vertW[l][v]].push_back( vertW[l - 1][v] );
                g[vertW[l][v]].push_back( vertW[l - 1][parent[l - 1][v]] );
            }
        }

        for ( int i = 1; i <= m; i++ ) {
            g[vertP[i]].push_back( vertB[0][prisoners[i].b] );
            g[vertW[0][prisoners[i].w]].push_back( vertP[i] );
        }

        for ( int i = 1; i <= m; i++ ) {
            int u, v;

            u = prisoners[i].b, v = prisoners[i].w;
            if ( findParent( v, depth[v] - depth[u] ) == u )
                u = findParent( v, depth[v] - depth[u] - 1 );
            else
                u = parent[0][u];
            if ( depth[u] < depth[v] )
                swap( u, v );
            for ( int l = log2( n ); l >= 0; l-- ) {
                if ( depth[parent[l][u]] >= depth[v] ) {
                    g[vertB[l][u]].push_back( vertP[i] );
                    u = parent[l][u];
                }
            }
            for ( int l = log2( n ); l >= 0; l-- ) {
                if ( parent[l][u] != parent[l][v] ) {
                    g[vertB[l][u]].push_back( vertP[i] );
                    g[vertB[l][v]].push_back( vertP[i] );
                    u = parent[l][u];
                    v = parent[l][v];
                }
            }
            g[vertB[0][u]].push_back( vertP[i] );

            u = prisoners[i].b, v = prisoners[i].w;
            if ( findParent( u, depth[u] - depth[v] ) == v )
                v = findParent( u, depth[u] - depth[v] - 1 );
            else
                v = parent[0][v];
            if ( depth[u] < depth[v] )
                swap( u, v );
            for ( int l = MAX_LOG_N; l >= 0; l-- ) {
                if ( depth[parent[l][u]] >= depth[v] ) {
                    g[vertP[i]].push_back( vertW[l][u] );
                    u = parent[l][u];
                }
            }
            for ( int l = MAX_LOG_N; l >= 0; l-- ) {
                if ( parent[l][u] != parent[l][v] ) {
                    g[vertP[i]].push_back( vertW[l][u] );
                    g[vertP[i]].push_back( vertW[l][v] );
                    u = parent[l][u];
                    v = parent[l][v];
                }
            }
            g[vertP[i]].push_back( vertW[0][u] );
        }

        for ( int i = 0; i < V; i++ ) {
            for ( int j: g[i] )
                in[j]++;
        }
        queue<int> q;
        for ( int i = 0; i < V; 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 == V ? "Yes\n" : "No\n");
        
        for ( int v = 0; v < V; v++ )
            g[v].clear(), in[v] = 0;
        for ( int i = 1; i <= m; i++ )
            vertP[i] = 0;
        for ( int l = 0; l <= log2( n ); l++ ) {
            for ( int v = 1; v <= n; v++ ) 
                parent[l][v] = vertB[l][v] = vertW[l][v] = 0;
        }
    }

    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23