Submission #757457

#	Time	Username	Problem	Language	Result	Execution time	Memory
757457		drdilyor	Tracks in the Snow (BOI13_tracks)	C++17	2.19 / 100	874 ms	747180 KiB

tracks

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    int n, m;
    cin >> n >> m;
    vector<string> mat(n);
    string res;
    for (string& s : mat) {
        cin >> s;
        res += s;
    }
    vector vis(n, vector(m, 0));
    auto dfs = [&](auto &dfs, int i, int j)-> void {
        if (i < 0 || i >= n || j < 0 || j >= m) return;
        if (vis[i][j]) return;
        if (mat[i][j] != mat[0][0]) return;
        vis[i][j] = 1;
        dfs(dfs, i+1, j);
        dfs(dfs, i-1, j);
        dfs(dfs, i, j+1);
        dfs(dfs, i, j-1);
    };
    int r = res.find('R') != string::npos;
    int f = res.find('F') != string::npos;
    if (f&&r) {
        dfs(dfs, 0, 0);
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                if (!vis[i][j] && mat[i][j] == mat[0][0]) { f = 2; break; }
            }
        }
    }
    cout << r+f<< '\n';
    return 0;
}

• Subtask 1: 0 / 30
• Subtask 2: 2.1875 / 70