Submission #1094302

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094302		stomic07	Portals (BOI14_portals)	C++17	20 / 100	6 ms	4444 KiB

portals

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

const int N = 1005;
int bio[N][N];
int rowmov[4] = {-1, 0, 1, 0};
int colmov[4] = {0, 1, 0, -1};

struct koor{
	int row;
	int col;
};

void portalfill(const vector<vector<char>>& v, const koor& curr, queue<koor>& que){
	for (int i=0; i<4; ++i){
		for (int j=1; ; ++j){
			koor novi;
			novi.row = curr.row + rowmov[i] * j;
			novi.col = curr.col + colmov[i] * j;
			if (v[novi.row][novi.col] == '#'){
				if (bio[novi.row - rowmov[i]][novi.col - colmov[i]] == -1){
					koor k;
					k.row = novi.row - rowmov[i];
					k.col = novi.col - colmov[i];
					que.push(k);
				}
				break;
			}
		}
	}
	bool zid = 0;
	for (int i=0; i<4; ++i){
		int r = curr.row + rowmov[i];
		int c = curr.col + colmov[i];
		if (v[r][c] == '#') zid = 1;
	}
	if (zid) return;
	for (int i=0; i<4; ++i){
		int r = curr.row + rowmov[i];
		int c = curr.col + colmov[i];
		if (bio[r][c] != -1 && bio[r][c] == bio[curr.row][curr.col] - 1){
			koor k;
			k.row = r;
			k.col = c;
			portalfill(v, k, que);
		}
	}
}

void bfs(const vector<vector<char>>& v, pair<int, int> start){
	queue<koor> que;
	koor k;
	k.row = start.first;
	k.col = start.second;
	que.push(k);
	for (int steps = 0; !que.empty(); ++steps){
		queue<koor> novi;
		while (!que.empty()){
			koor curr = que.front();
			que.pop();
			if (bio[curr.row][curr.col] != -1) continue;
			bio[curr.row][curr.col] = steps;
			if (v[curr.row][curr.col] == 'C') return;
			bool zid = 0;
			for (int i=0; i<4; ++i){
				koor sus;
				sus.row = curr.row + rowmov[i];
				sus.col = curr.col + colmov[i];
				if (v[sus.row][sus.col] != '#'){
					novi.push(sus);
				}
				else{
					zid = 1;
				}
			}
			if (zid){
				portalfill(v, curr, novi);
			}
		}
		que = novi;
	}
}

void reset(){
	for (int i=0; i<N; ++i){
		for (int j=0; j<N; ++j){
			bio[i][j] = -1;
		}
	}
}

int main(){
	reset();
	int n, m;
	cin >> n >> m;
	vector<char> nule;
	for (int i=0; i<m+2; ++i){
		nule.push_back('#');
	}
	vector<vector<char>> v;
	v.push_back(nule);
	pair<int, int> start;
	pair<int, int> cilj;
	for (int i=0; i<n; ++i){
		vector<char> red;
		red.push_back('#');
		for (int j=0; j<m; ++j){
			char c;
			cin >> c;
			red.push_back(c);
			if (c == 'S'){
				start.first = i+1;
				start.second = j+1;
			}
			if (c == 'C'){
				cilj.first = i+1;
				cilj.second = j+1;
			}
		}
		red.push_back('#');
		v.push_back(red);
	}
	v.push_back(nule);
	bfs(v, start);
	cout << bio[cilj.first][cilj.second] << "\n";
	return 0;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30