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Submission #943705

# Submission time Handle Problem Language Result Execution time Memory
943705 2024-03-11T18:22:12 Z LucaIlie Uplifting Excursion (BOI22_vault) C++17
0 / 100
 1 ms 348 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAX_M = 100;
const int MAX_S = 4;// MAX_M * MAX_M;
const int MIN_S = -MAX_S;
const long long INF = 1e18;
int m;
unordered_map<int, long long> taken, untaken;
unordered_map<int, long long> dpCrt, dpPrv;

void add( int x, int i ) {
    swap( dpCrt, dpPrv );

    for ( int s = MIN_S; s <= MAX_S; s++ )
        dpCrt[s] = dpPrv[s];

    for ( int s = MIN_S; s - i * x <= MAX_S; s++ ) {
        if ( MIN_S <= s - i * x && s - i * x <= MAX_S )
            dpCrt[s] = max( dpCrt[s], dpPrv[s - i * x] + x );
    }

    for ( int s = MIN_S; s <= MAX_S; s++ )
        dpCrt[s] = (dpCrt[s] <= -INF + m ? -INF : dpCrt[s]);
}

void substract( int x, int i ) {
    swap( dpCrt, dpPrv );

    for ( int s = MIN_S; s <= MAX_S; s++ )
        dpCrt[s] = dpPrv[s];

    for ( int s = MIN_S; s <= MAX_S; s++ ) {
        if ( MIN_S <= s + i * x && s + i * x <= MAX_S )
            dpCrt[s] = max( dpCrt[s], dpPrv[s + i * x] - x );
    }

    for ( int s = MIN_S; s <= MAX_S; s++ )
        dpCrt[s] = (dpCrt[s] <= -INF + m ? -INF : dpCrt[s]);
}

void afis() {
    for ( int s = MIN_S; s <= MAX_S; s++ )
        cout << dpCrt[s] << " ";
    cout << "\n";
}

int main() {
    long long l, u = 0, t = 0;

    cin >> m >> l;
    for ( int i = -m; i <= m; i++ ) {
        cin >> untaken[i];
        u += untaken[i];
    }

    if ( l < 0 ) {
        for ( int i = 1; i <= m; i++ )
            swap( untaken[i], untaken[-i] );
        l = -l;
    }

    long long s = 0;
    for ( int i = -m; i <= 0; i++ ) {
        long long x = untaken[i];
        s += i * x;
        taken[i] += x;
        untaken[i] -= x;
        t += x;
        u -= x;
    }
    for ( int i = 1; i <= m; i++ ) {
        long long x = min( untaken[i], (l - s) / i );
        s += i * x;
        taken[i] += x;
        untaken[i] -= x;
        t += x;
        u -= x;
    }

    if ( s + m < l ) {
        for ( int i = -m; i < 0; i++ ) {
            long long x = min( taken[i], (l - s) / (-i) );
            s -= i * x;
            taken[i] -= x;
            untaken[i] += x;
            t -= x;
            u += x;
        }
    }

    /*cout << s << "\n";
    for ( int i = -m; i <= m; i++ )
        cout << taken[i] << " " << untaken[i] << "\n";*/

    for ( int s = MIN_S; s <= MAX_S; s++ )
        dpCrt[s] = -INF;
    dpCrt[0] = 0;

    for ( int i = -m; i <= m; i++ ) {
        int k;

        k = min( (long long)m, untaken[i] );
        for ( int b = 1; (1 << b) - 1 <= k; b++ )
            add( (1 << (b - 1)), i );
        add( k - (1 << ((int)log2( k ))), i );

        k = min( (long long)m, taken[i] );
        for ( int b = 1; (1 << b) - 1 <= k; b++ )
            substract( (1 << (b - 1)), i );
        substract( k - (1 << ((int)log2( k ))), i );
    }


    if ( l - s > MAX_S || dpCrt[l - s] == -INF )
        cout << "impossible\n";
    else
        cout << t + dpCrt[l - s] << "\n";

    return 0;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6-1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6-2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -