Submission #159016

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
159016	2019-10-20 06:01:28	FutymyClone	Tracks in the Snow (BOI13_tracks)	C++14	100 / 100	1047 ms	373760 KiB

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#include <bits/stdc++.h>
using namespace std;
const int N = 4005;
int n, m, ans = 0;
bool visited[N][N];
string a[N];
int dx[4] = {0, -1, 0, 1};
int dy[4] = {-1, 0, 1, 0};
bool ok (int x, int y) {
    return (x >= 0 && x < n && y >= 0 && y < m && !visited[x][y] && a[x][y] != '.');
}
void bfs (queue <pair <int, int> > &q1, queue <pair <int, int> > &q2) {
    if (q1.empty()) return;
    ans++;
    while (!q1.empty()) {
        int x = q1.front().first, y = q1.front().second; q1.pop();
        for (int i = 0; i < 4; i++) {
            int nx = x + dx[i];
            int ny = y + dy[i];
            if (!ok(nx, ny)) continue;
            visited[nx][ny] = true;
            if (a[nx][ny] == a[x][y]) q1.push({nx, ny});
            else q2.push({nx, ny});
        }
    }
 
 
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• Subtask 1: 30 / 30
• Subtask 2: 70 / 70