Submission #1239723

#	Time	Username	Problem	Language	Result	Execution time	Memory
1239723		Noname_1900	Tracks in the Snow (BOI13_tracks)	C++20	47.50 / 100	2119 ms	1079028 KiB

tracks

#include<bits/stdc++.h>
using namespace std;
const int NMAX = 4000;
const int INFINI = 1000000;
char tab[NMAX][NMAX];
int nbAVoir;
int nbL, nbC;
int dir[4][2] = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
int dejaVu[NMAX][NMAX];
void parcourir(int l, int c, char typeActu, int iDejaVu)
{
    if((l < 0) || (c < 0) || (l >= nbL) || (c >= nbC))  return;
    if(dejaVu[l][c] == iDejaVu) return;
    dejaVu[l][c] = iDejaVu;
  //  cout << l << " " << c << "\n";
    if((tab[l][c] == typeActu)) 
    {
        nbAVoir--;
        tab[l][c] = 'T';
    }
    else if(tab[l][c] != 'T')   return;
    for(int iD = 0; iD < 4; iD++)
    {
        parcourir(l+dir[iD][0], c+dir[iD][1], typeActu, iDejaVu);
    }
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> nbL >> nbC;
    nbAVoir = 0;
    for(int l = 0; l < nbL; l++)
    {
        for(int c = 0; c < nbC; c++)
        {
            cin >> tab[l][c];
            if(tab[l][c] != '.')    nbAVoir++;
        }
    }
    char dep = tab[0][0];
    int nbTypes = 0;
    while(nbAVoir)
    {
        nbTypes++;
        parcourir(0, 0, dep, nbTypes);
        if(dep == 'F')  dep = 'R';
        else    dep = 'F';
    }
    cout << nbTypes;
}

• Subtask 1: 30 / 30
• Subtask 2: 17.5 / 70