Submission #817899

#	Time	Username	Problem	Language	Result	Execution time	Memory
817899		LucaIlie	Mergers (JOI19_mergers)	C++17	0 / 100	64 ms	36192 KiB

mergers

#include <bits/stdc++.h>

using namespace std;

const int INF = 1e9;
const int MAX_B = 1e6;

const int MAX_N = 2000;
const int MAX_L = 2000;

bool active[MAX_N];
int permutation[MAX_N];
double happiness[MAX_N][MAX_L + 1], sumHappiness[MAX_N][MAX_L + 1];
double happy[MAX_N], timeFrac[MAX_N], timeFractions[MAX_N];

int main() {
    int n, l;

    cin >> n >> l;
    for ( int i = 0; i < n; i++ ) {
        happy[i] = 0;
        sumHappiness[i][0] = 0;
        for ( int j = 1; j <= l; j++ ) {
            int aux;
            cin >> aux;
            happiness[i][j] = aux;
            happy[i] += aux;
            sumHappiness[i][j] = sumHappiness[i][j - 1] + happiness[i][j];
        }
        happy[i] /= n;
    }

    for ( int i = 0; i < n; i++ )
        active[i] = true;

    timeFractions[0] = 0;
    permutation[0] = 0;
    for ( int pas = 1; pas <= n; pas++ ) {
        for ( int i = 0; i < n; i++ ) {
            if ( !active[i] ) {
                timeFrac[i] = INF + 1;
                continue;
            }

            int j = floor( timeFractions[pas - 1] );
            double crtHappiness = happiness[i][j + 1] * (j + 1 - timeFractions[pas - 1]);

            if ( crtHappiness > happy[i] ) {
                timeFrac[i] = timeFractions[pas - 1] + happy[i] / happiness[i][j + 1];
                continue;
            }

            int left = j + 1, right = l + 1;
            while ( right - left > 1 ) {
                int mid = (left + right) / 2;

                if ( crtHappiness + (sumHappiness[i][mid] - sumHappiness[i][j + 1]) < happy[i] )
                    left = mid;
                else
                    right = mid;
            }
            if ( left == l ) {
                timeFrac[i] = INF;
                continue;
            }
            crtHappiness = crtHappiness + (sumHappiness[i][left] - sumHappiness[i][j + 1]);
            timeFrac[i] = left + (happy[i] - crtHappiness) / happiness[i][left + 1];
        }
        int p = 0;
        for ( int i = 0; i < n; i++ ) {
            if ( active[i] && timeFrac[i] < timeFrac[p] )
                p = i;
        }

        timeFractions[pas] = timeFrac[p];
        permutation[pas] = p;
        active[p] = false;
    }

    for ( int i = 1; i < n; i++ )
        cout << (int)floor( timeFractions[i] * MAX_B ) + 1000 << " " << MAX_B << "\n";
    for ( int i = 1; i <= n; i++ )
        cout << permutation[i] + 1 << " ";

    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 24
• Subtask 3: 0 / 14
• Subtask 4: 0 / 22
• Subtask 5: 0 / 30