oj.uz

Submission #68659

# Submission time Handle Problem Language Result Execution time Memory
68659 2018-08-17T20:10:32 Z AdrienVannson Cultivation (JOI17_cultivation) C++14
0 / 100
 73 ms 552 KB 
// Sous-tâche 1 & 2

#include <algorithm>
#include <iostream>
#include <cstdio>
#include <array>

using namespace std;

const int oo = 1000*1000*1000;

const int TAILLE_MAX_GRILLE_DEPART = 2*40;

const int TAILLE_MAX = 2 * TAILLE_MAX_GRILLE_DEPART;
const int NB_MAX_LIGNES = TAILLE_MAX;
const int NB_MAX_COLONNES = TAILLE_MAX;



int nbLignes, nbColonnes;
bool estPlein[NB_MAX_LIGNES][NB_MAX_COLONNES];


bool getEstPossible (const int nbBas, const int nbDroite)
{
    int nbRectangles[NB_MAX_LIGNES][NB_MAX_COLONNES];
    fill(*nbRectangles, *nbRectangles+NB_MAX_LIGNES*NB_MAX_COLONNES, 0);

    for (int iLigne=0; iLigne<nbLignes; iLigne++) {
        for (int iColonne=0; iColonne<nbColonnes; iColonne++) {
            if (estPlein[iLigne][iColonne]) {
                nbRectangles[iLigne][iColonne]++;
                nbRectangles[iLigne][iColonne+nbDroite+1]--;
                nbRectangles[iLigne+nbBas+1][iColonne]--;
                nbRectangles[iLigne+nbBas+1][iColonne+nbDroite+1]++;
            }
        }
    }

    // Pour chaque cellule, calculer par combien de rectangles elle est recouverte
    for (int iLigne=0; iLigne<NB_MAX_LIGNES-1; iLigne++) {
        for (int iColonne=0; iColonne<NB_MAX_COLONNES-1; iColonne++) {
            nbRectangles[iLigne][iColonne+1] += nbRectangles[iLigne][iColonne];
            nbRectangles[iLigne+1][iColonne] += nbRectangles[iLigne][iColonne];
            nbRectangles[iLigne+1][iColonne+1] -= nbRectangles[iLigne][iColonne];
        }
    }

    // Pour chaque cellule, calculer le nombre de cellules consecutives à droite
    int nbADroite[NB_MAX_LIGNES];
    fill(nbADroite, nbADroite+NB_MAX_LIGNES, 0);

    for (int iColonne=NB_MAX_COLONNES-1; iColonne>=0; iColonne--) {
        for (int iLigne=0; iLigne<NB_MAX_LIGNES; iLigne++) {

            nbADroite[iLigne]++;

            if (nbRectangles[iLigne][iColonne] == 0) {
                nbADroite[iLigne] = 0;
            }
        }

        // Vérification de la validité sur la colonne actuelle
        int iLigneDebut = -1; // Exclu (sur une cellule invalide)

        for (int iLigneFin=0; iLigneFin<NB_MAX_LIGNES; iLigneFin++) { // Inclus

            if (nbADroite[iLigneFin] < nbColonnes) {
                iLigneDebut = iLigneFin;
            }

            if (iLigneFin - iLigneDebut >= nbLignes) {
                return true;
            }

        }
    }

    return false;
}


int main ()
{
    scanf("%d %d", &nbLignes, &nbColonnes);

    if (nbLignes > 40 || nbColonnes > 40) {
        exit(42);
    }


    for (int iLigne=0; iLigne<nbLignes; iLigne++) {
        for (int iColonne=0; iColonne<nbColonnes; iColonne++) {
            estPlein[iLigne][iColonne] = false;
        }
    }

    int nbCellulesPleines;
    scanf("%d", &nbCellulesPleines);

    for (int iCellule=0; iCellule<nbCellulesPleines; iCellule++) {
        int iLigne, iColonne;
        scanf("%d %d", &iLigne, &iColonne);
        iLigne--, iColonne--;

        estPlein[iLigne][iColonne] = true;
    }

    int nbEtapesMin = +oo;

    for (int nbEtapesBas=0; nbEtapesBas<TAILLE_MAX_GRILLE_DEPART; nbEtapesBas++) {

        int debut = 0;
        int fin = TAILLE_MAX_GRILLE_DEPART;

        while (fin-debut > 1) {
            const int milieu = (debut + fin) / 2;

            if (getEstPossible(nbEtapesBas, milieu)) {
                fin = milieu;
            }
            else {
                debut = milieu;
            }
        }

        if (fin < TAILLE_MAX_GRILLE_DEPART) {
            nbEtapesMin = min(nbEtapesBas+fin, nbEtapesMin);
        }
    }

    printf("%d\n", nbEtapesMin);

    return 0;
}

Compilation message

cultivation.cpp: In function 'int main()':
cultivation.cpp:85:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &nbLignes, &nbColonnes);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cultivation.cpp:99:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &nbCellulesPleines);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
cultivation.cpp:103:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &iLigne, &iColonne);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 376 KB Output is correct
2 Incorrect 70 ms 512 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 376 KB Output is correct
2 Incorrect 70 ms 512 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 376 KB Output is correct
2 Incorrect 70 ms 512 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 552 KB Execution failed because the return code was nonzero
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 552 KB Execution failed because the return code was nonzero
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 376 KB Output is correct
2 Incorrect 70 ms 512 KB Output isn't correct
3 Halted 0 ms 0 KB -