Submission #1026632

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026632		kkkkkkkk	Tracks in the Snow (BOI13_tracks)	C++14	100 / 100	509 ms	113112 KiB

tracks

#include <bits/stdc++.h>

using namespace std;

int dr[]={+1, 0, -1, 0};
int dc[]={0, +1, 0, -1};

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    char tracks[n][m];
    for (int i=0;i<n;i++)
        for (int j=0;j<m;j++)
            cin >> tracks[i][j];
    deque<pair<int,int> > q;
    q.push_back({0,0});
    int vis[n][m], rez=1;
    memset(vis, 0, sizeof(vis));
    vis[0][0]=1;
    while (!q.empty()) {
        int r=q.front().first, c=q.front().second;
        q.pop_front();
        rez=max(rez, vis[r][c]);
        for (int i=0;i<4;i++) {
            int nr=r+dr[i], nc=c+dc[i];
            if (nr>=0&&nc>=0&&nr<n&&nc<m&&tracks[nr][nc]!='.'&&!vis[nr][nc]) {
                if (tracks[nr][nc]!=tracks[r][c]) {
                    vis[nr][nc]=vis[r][c]+1;
                    q.push_back({nr, nc});
                }
                else {
                    vis[nr][nc]=vis[r][c];
                    q.push_front({nr, nc});
                }
            }
        }
    }
    cout << rez;

    return 0;
}

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