Submission #438473

#	Time	Username	Problem	Language	Result	Execution time	Memory
438473		zeyu	Tracks in the Snow (BOI13_tracks)	C++17	2.19 / 100	1241 ms	123084 KiB

tracks

#include <bits/stdc++.h>
using namespace std;
int dx[4] = {1, -1, 0, 0};
int dy[4] = {0, 0, 1, -1};

int main(){
	int n, m;
	cin >> n >> m;
	vector<string> a(n);
	for (int i = 0; i < n; i ++) cin >> a[i];
	char cur = a[0][0];
	int graph[n][m];
	for (int i = 0; i < n; i ++){
		for (int j = 0; j < m; j ++){
			if (a[i][j] == cur) graph[i][j] = 1;
			else if (a[i][j] == '.') graph[i][j] = 0;
			else graph[i][j] = 2;
		}
	}
	int ans = 1;
	bool add = false;
	for (int i = 0; i < n; i ++) for (int j = 0; j < m; j ++) if (graph[i][j] == 2) add = true;
	if (add) ans ++;
	add = false;
	bool vis[n][m];
	memset(vis, false, sizeof(vis));
	vis[0][0] = true;
	queue<pair<int, int> > que;
	que.push(make_pair(0, 0));
	while(! que.empty()){
		pair<int, int> p = que.front();
		que.pop();
		for (int i = 0; i < 4; i ++){
			int x = p.first + dx[i];
			int y = p.second + dy[i];
			if (x >= 0 && x < n && y >= 0 && y < m && ! vis[x][y]){
				vis[x][y] = true;
				que.push(make_pair(x, y));
			}
		}
	}
	for (int i = 0; i < n; i ++){
		for (int j = 0; j < m; j ++){
			if (graph[i][j] == 1 && ! vis[i][j]) {
			 	add = true;
			}
		}
	}
	if (add) ans ++;
	cout << ans << endl;
}

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