Submission #892532

#	Time	Username	Problem	Language	Result	Execution time	Memory
892532		vanea	Tracks in the Snow (BOI13_tracks)	C++17	2.19 / 100	1053 ms	1048576 KiB

tracks

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int mxN = 4e3+10;

char matrix[mxN][mxN];
bool vis[mxN][mxN];
int n, m;

vector<int> xy = {1, 0, -1, 0}, yx = {0, 1, 0, -1};

int add = 1;

void dfs(int x, int y) {
    char c = matrix[x][y];
    vis[x][y] = true;
    for(int i = 0; i < 4; i++) {
        int a = x + xy[i], b = y + yx[i];
        if(a >= 0 && a < n && b >= 0 && b < m && !vis[a][b]) {
            if(matrix[a][b] == c){
                dfs(a, b);
            }
            if(matrix[a][b] != c && matrix[a][b] != '.') {
                add = 2;
                dfs(a, b);
            }
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            cin >> matrix[i][j];
        }
    }
    int ans = 0;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            if(matrix[i][j] != '.' && !vis[i][j]) {
                dfs(i, j);
                ans += add;
                add = 1;
            }
        }
    }
    cout << ans;
    return 0;
}

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