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Submission #467314

# Submission time Handle Problem Language Result Execution time Memory
467314 2021-08-22T13:40:58 Z LucaIlie Easter Eggs (info1cup17_eastereggs) C++17
100 / 100
 21 ms 364 KB 
#include <stdio.h>
#include <vector>
#include "grader.h"

#define MAX_N 512

using namespace std;

int o;
int ord[MAX_N];
//vector <pair<int, int>> brdgs;
vector <int> m[MAX_N + 1];
vector <int> v;


/*int query( vector <int> insula ) {
    int ans, i;

    for ( i = 0; i < insula.size(); i++ )
        printf( "%d ", insula[i] );
    printf( "\n" );

    scanf( "%d", &ans );

    return ans;
}*/

void dfs( int nod, int p ) {
    int i;

    ord[o] = nod;
    o++;
    for ( i = 0; i < m[nod].size(); i++ ) {
        if ( m[nod][i] != p )
            dfs( m[nod][i], nod );
    }
}

int findEgg( int n, vector <pair<int, int>> bridges ) {
    int st, dr, mij, i;

    for ( i = 0; i <= n; i++ )
        m[i].clear();
    for ( i = 0; i < n - 1; i++ ) {
        m[bridges[i].first].push_back( bridges[i].second );
        m[bridges[i].second].push_back( bridges[i].first );
    }

    o = 0;
    dfs( 1, 0 );

    st = -1;
    dr = n - 1;
    while ( dr - st > 1 ) {
        mij = (st + dr) / 2;

        v.clear();
        for ( i = 0; i <= mij; i++ )
            v.push_back( ord[i] );

        if ( query( v ) )
            dr = mij;
        else
            st = mij;
    }

    return ord[dr];
}

/*int main() {
    int n, a, b, i;

    scanf( "%d", &n );
    for ( i = 0; i < n - 1; i++ ) {
        scanf( "%d%d", &a, &b );
        brdgs.push_back( make_pair( a, b ) );
    }

    printf( "%d", findEgg( n, brdgs ) );

    return 0;
}*/

Compilation message

eastereggs.cpp: In function 'void dfs(int, int)':
eastereggs.cpp:33:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for ( i = 0; i < m[nod].size(); i++ ) {
      |                  ~~^~~~~~~~~~~~~~~

Subtask #1
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 200 KB Number of queries: 4
2 Correct 1 ms 200 KB Number of queries: 4
3 Correct 1 ms 200 KB Number of queries: 4
4 Correct 1 ms 200 KB Number of queries: 4

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 336 KB Number of queries: 8
2 Correct 13 ms 328 KB Number of queries: 9
3 Correct 20 ms 328 KB Number of queries: 9
4 Correct 18 ms 344 KB Number of queries: 9

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 364 KB Number of queries: 9
2 Correct 17 ms 340 KB Number of queries: 9
3 Correct 18 ms 352 KB Number of queries: 9
4 Correct 19 ms 328 KB Number of queries: 9