제출 #827846

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
827846		Tobotis	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	654 ms	130612 KiB

tracks

#include <bits/stdc++.h>

using namespace std;

int dx[4]{0, 0, 1, -1}, dy[4]{1, -1, 0, 0};

int dist[4000][4000];

int w, h;

bool inside(int i, int j)
{
    return (0 <= i && i < w && 0 <= j && j < h);
}

int main()
{
    cin >> w >> h;
    vector<string> mp(4000);
    for (int i = 0; i < w; i++)
    {
        cin >> mp[i];
    }

    int ans = 1;

    deque<pair<int, int>> q;
    dist[0][0] = 1;
    q.push_back({0, 0});
    while (!q.empty())
    {
        auto [x, y] = q.front();
        q.pop_front();

        for (int i = 0; i < 4; i++)
        {
            int newx = x + dx[i];
            int newy = y + dy[i];
            if (inside(newx, newy) && dist[newx][newy] == 0 && mp[newx][newy] != '.')
            {
                if (mp[newx][newy] == mp[x][y])
                {
                    dist[newx][newy] = dist[x][y];
                    q.push_front({newx, newy});
                }
                else
                {
                    dist[newx][newy] = dist[x][y] + 1;
                    ans = max(ans, dist[newx][newy]);
                    q.push_back({newx, newy});
                }
            }
        }
    }
    cout << ans << endl;
    return 0;
}

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