Submission #44865

#	Time	Username	Problem	Language	Result	Execution time	Memory
44865		iletavcioski	Tracks in the Snow (BOI13_tracks)	C++17	91.25 / 100	2153 ms	1048576 KiB

tracks

#include <iostream>
#include <queue>
using namespace std;
struct node 
{
    int x;
    int y;
};
int n,m;
char mat[4004][4004];
bool vis[4004][4004];
int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};
int brojac;
void bfs(queue<node> q1,queue<node> q2,int broj)
{
    if(q1.empty())
        return;
    brojac=broj;
    while(!q1.empty())
    {
        node g=q1.front();
        q1.pop();
        for(int i=0;i<4;i++)
        {
            if(g.x+dx[i]<n&&g.x+dx[i]>=0&&g.y+dy[i]<m&&g.y+dy[i]>=0)
            {
                if(!vis[g.x+dx[i]][g.y+dy[i]]&&mat[g.x+dx[i]][g.y+dy[i]]!='.')
                {
                    if(mat[g.x+dx[i]][g.y+dy[i]]!=mat[g.x][g.y])
                    {
                        node g1;
                        g1.x=g.x+dx[i];
                        g1.y=g.y+dy[i];
                        q2.push(g1);
                        vis[g1.x][g1.y]=true;
                    }
                    else
                    {
                        node g1;
                        g1.x=g.x+dx[i];
                        g1.y=g.y+dy[i];
                        q1.push(g1);
                        vis[g1.x][g1.y]=true;
                    }
                }
            }
        }
    }
    bfs(q2,q1,broj+1);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie();
    cout.tie();
    cin>>n>>m;
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<m;j++)
            cin>>mat[i][j];
    }
    queue<node> q1,q2;
    node g;
    g.x=0;
    g.y=0;
    q1.push(g);
    vis[0][0]=true;
    bfs(q1,q2,1);
    cout<<brojac<<endl;
    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 61.25 / 70