Submission #841383

#	Time	Username	Problem	Language	Result	Execution time	Memory
841383		LucaIlie	Minerals (JOI19_minerals)	C++17	40 / 100	34 ms	3000 KiB

minerals

#include "minerals.h"
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 43000;
int pairr[2 * MAX_N + 1], perm[2 * MAX_N + 1];
bool inSet[2 * MAX_N + 1];
vector<int> firstt, secondd;
int ans = 0;

void solve( int n ) {
    for ( int b = log2( n ); b >= 0; b-- ) {
        int g1 = 0, g0 = 0;
        for ( int i = 0; i < n; i++ ) {
            if ( (i & (1 << b)) ) {
                g1++;
                if ( !inSet[firstt[i]] ) {
                    ans = Query( firstt[i] );
                    inSet[firstt[i]] = true;
                }
            } else {
                g0++;
                if ( inSet[firstt[i]] ) {
                    ans = Query( firstt[i] );
                    inSet[firstt[i]] = false;
                }
            }
        }

        for ( int i = 0; i < n; i++ ) {
            if ( g0 == 0 ) {
                pairr[secondd[i]] += (1 << b);
                continue;
            }
            if ( g1 == 0 )
                continue;

            int prevAns = ans;
            ans = Query( secondd[i] );
            inSet[secondd[i]] ^= 1;

            if ( ans == prevAns ) {
                pairr[secondd[i]] += (1 << b);
                g1--;
            } else
                g0--;
        }
    }
}

void Solve( int n ) {
    vector <int> v;
    for ( int i = 1; i <= 2 * n; i++ ) {
        v.push_back( i );
        perm[i] = i;
    }
    random_shuffle( perm + 1, perm + 1 + 2 * n );

    int prevAns = 0;
    for ( int i = 1; i <= 2 * n; i++ ) {
        if ( firstt.size() == n ) {
            secondd.push_back( perm[i] );
            continue;
        }

        ans = Query( perm[i] );
        inSet[perm[i]] = true;
        if ( ans > prevAns )
            firstt.push_back( perm[i] );
        else
            secondd.push_back( perm[i] );
        prevAns = ans;
    }

    solve( n );

    for ( int i = 0; i < n; i++ )
        Answer( secondd[i], firstt[pairr[secondd[i]]] );
}

Compilation message (stderr)

minerals.cpp: In function 'void Solve(int)':
minerals.cpp:62:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   62 |         if ( firstt.size() == n ) {
      |              ~~~~~~~~~~~~~~^~~~

• Subtask 1: 6 / 6
• Subtask 2: 25 / 25
• Subtask 3: 9 / 9
• Subtask 4: 0 / 30
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 5
• Subtask 8: 0 / 5
• Subtask 9: 0 / 10