Submission #992097

#	Time	Username	Problem	Language	Result	Execution time	Memory
992097		MladenP	Tracks in the Snow (BOI13_tracks)	C++17	51.88 / 100	2105 ms	1048576 KiB

tracks

#include <iostream>
#include <string>

using namespace std;
const int MAXN = 4002;

int cx[4] = {+1, 0, -1, 0};
int cy[4] = { 0,-1,  0,+1};
string s[MAXN];
int dfs(int i, int j, char c) {
    int sol = 1;
    s[i][j] = (c == 'F' ? 'R':'F');
    for (int dir = 0; dir < 4; dir++) {
        if (s[i+cx[dir]][j+cy[dir]] == c) {
            sol += dfs(i+cx[dir], j+cy[dir], c);
        }
    }
    return sol;
}

int main() {
    ios::sync_with_stdio(false); cin.tie(0);
    int H, W; cin >> H >> W;
    s[0] = string(W+1, '#');
    for (int i = 1; i <= H; i++) {
        cin >> s[i];
        s[i] = '#' + s[i] + '#';
    }
    s[H+1] = string(W+1, '#');

    int prev = 0, cur, sol = 0;
    while((cur = dfs(1, 1, s[1][1])) != prev) {
        prev = cur;
        sol++;
    }
    cout << sol;
    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 21.875 / 70