oj.uz

Submission #943240

# Submission time Handle Problem Language Result Execution time Memory
943240 2024-03-11T09:36:37 Z WongYiKai Portals (BOI14_portals) C++14
70 / 100
 223 ms 262144 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll r,c;

ll a(ll i, ll j) {
	return (i)*(c+2)+j;
}
pair<ll,ll> ra(ll x) {
	return {(x)/(c+2),(x)%(c+2)};
}


int main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> r >> c;
	//if (r*c>100) return 0;
	ll grid[r+5][c+5];
	ll s,e;
	memset(grid,0,sizeof(grid));
	for (int i=1;i<=r;i++){
		string temp;
		cin >> temp;
		for (int j=1;j<=c;j++){
			if (temp[j-1]=='.') grid[i][j] = 1;
			else if (temp[j-1]=='#') grid[i][j] = 0;
			else if (temp[j-1]=='C') {
				grid[i][j] = 1;
				e = a(i,j);
			}
			else{
				grid[i][j] = 1;
				s = a(i,j);
			}
		}
	}
	ll visited[r*c+r+r+c+c+10];
	queue<pair<ll,ll>> bfs;
	memset(visited,0,sizeof(visited));
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			if (grid[i][j]==0) continue;
			ll check=0;
			if (grid[i-1][j]==0) check=1;
			else if (grid[i+1][j]==0) check=1;
			else if (grid[i][j-1]==0) check=1;
			else if (grid[i][j+1]==0) check=1;
			if (check==0) continue;
			bfs.push({a(i,j),0});
			visited[a(i,j)]=1;
		}
	}
	ll dist[r*c+r+r+c+c+10];
	memset(dist,-1,sizeof(dist));
	while (!bfs.empty()){
		ll x = bfs.front().first;
		ll rnk = bfs.front().second;
		dist[x] = rnk;
		bfs.pop();
		ll item;
		pair<ll,ll> temp;
		item=x-1;
		if (visited[item]==0){
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				visited[item] = 1;
				bfs.push({item,rnk+1});
			}
		}
		item=x+1;
		if (visited[item]==0){
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				visited[item] = 1;
				bfs.push({item,rnk+1});
			}
		}
		item=x-c-2;
		if (visited[item]==0){
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				visited[item] = 1;
				bfs.push({item,rnk+1});
			}
		}
		item=x+c+2;
		if (visited[item]==0){
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				visited[item] = 1;
				bfs.push({item,rnk+1});
			}
		}
	}
	/*
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			cout << dist[a(i,j)] << " ";
		}
		cout << "\n";
	}
	*/
	ll left[r*c+r+r+c+c+10],right[r*c+r+r+c+c+10],up[r*c+r+r+c+c+10],down[r*c+r+r+c+c+10];
	for (int j=1;j<=c;j++) up[a(0,j)] = a(0,j);
	for (int i=1;i<=r;i++){
		if (grid[i][1]==0) {
			left[a(i,1)]=a(i,1);
			up[a(i,1)]=a(i,1);
		}
		else {
			left[a(i,1)]=a(i,0);
			up[a(i,1)] = up[a(i-1,1)];
		}
		for (int j=2;j<=c;j++){
			if (grid[i][j]==0) {
				left[a(i,j)] = a(i,j);
				up[a(i,j)] = a(i,j);
			}
			else {
				left[a(i,j)] = left[a(i,j-1)];
				up[a(i,j)] = up[a(i-1,j)];
			}
		}
	}
	//right down
	for (int j=1;j<=c;j++) down[a(r+1,j)] = a(r+1,j);
	for (int i=r;i>=1;i--){
		if (grid[i][c]==0) {
			right[a(i,c)]=a(i,c);
			down[a(i,c)]=a(i,c);
		}
		else {
			right[a(i,c)]=a(i,c+1);
			down[a(i,c)] = down[a(i+1,c)];
		}
		for (int j=c-1;j>=1;j--){
			if (grid[i][j]==0) {
				right[a(i,j)] = a(i,j);
				down[a(i,j)] = a(i,j);
			}
			else {
				right[a(i,j)] = right[a(i,j+1)];
				down[a(i,j)] = down[a(i+1,j)];
			}
		}
	}
	/*
	cout << "left\n";
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			cout << ra(left[a(i,j)]).first << "," << ra(left[a(i,j)]).second << " ";
		}
		cout << "\n";
	}
	cout << "right\n";
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			cout << ra(right[a(i,j)]).first << "," << ra(right[a(i,j)]).second << " ";
		}
		cout << "\n";
	}
	cout << "down\n";
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			cout << ra(down[a(i,j)]).first << "," << ra(down[a(i,j)]).second << " ";
		}
		cout << "\n";
	}
	cout << "up\n";
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			cout << ra(up[a(i,j)]).first << "," << ra(up[a(i,j)]).second << " ";
		}
		cout << "\n";
	}
	*/
	
	vector<pair<ll,ll>> adj[r*c*5];
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			if (grid[i][j]==0) continue;
			ll x = a(i,j);
			ll item;
			pair<ll,ll> temp;
			item=x-1;
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				adj[x].push_back({item,1});
			}
			item=x+1;
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				adj[x].push_back({item,1});
			}
			item=x-c-2;
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				adj[x].push_back({item,1});
			}
			item=x+c+2;
			temp = ra(item);
			if (grid[temp.first][temp.second]==1){
				adj[x].push_back({item,1});
			}
			adj[x].push_back({left[x]+1,dist[x]+1});
			adj[x].push_back({down[x]-c-2,dist[x]+1});
			adj[x].push_back({up[x]+c+2,dist[x]+1});
			adj[x].push_back({right[x]-1,dist[x]+1});
		}
	}
	
	/*
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			cout << i << "," << j << ": ";
			for (auto item:adj[a(i,j)]){
				cout << ra(item.first).first << "," << ra(item.first).second << "," << item.second << " ";
			}
			cout << "\n";
		}
	}
	*/
	
	ll dis[r*c*5];
	priority_queue<pair<ll,ll>,vector<pair<ll,ll>>,greater<pair<ll,ll>>> pq;
	memset(dis,-1,sizeof(dis));
	dis[s]=0;
	pq.push({0,s});
	while (!pq.empty())	{
		pair<ll,ll> cur = pq.top();
		pq.pop();
		ll x = cur.second, d = cur.first;
		if (d>dis[x]) continue;
		for (vector<pair<ll,ll>>::iterator it=adj[x].begin();it!=adj[x].end();++it){
			ll nx = it->first, nd = d+it->second;
			if (dis[nx]!=-1 && dis[nx]<=nd) continue;
			dis[nx] = nd;
			pq.push({nd,nx});
		}
	}
	
	/*
	for (int i=1;i<=r;i++){
		for (int j=1;j<=c;j++){
			cout << dis[a(i,j)] << " ";
		}
		cout << "\n";
	}
	*/
	cout << dis[e];	
	//cout << "a";
	
}

Compilation message

portals.cpp: In function 'int main()':
portals.cpp:251:15: warning: 'e' may be used uninitialized in this function [-Wmaybe-uninitialized]
  251 |  cout << dis[e];
      |               ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 1116 KB Output is correct
10 Correct 1 ms 1116 KB Output is correct
11 Correct 1 ms 1116 KB Output is correct
12 Correct 1 ms 1112 KB Output is correct
13 Correct 1 ms 1116 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 1116 KB Output is correct
16 Correct 0 ms 348 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 13 ms 12124 KB Output is correct
6 Correct 13 ms 12124 KB Output is correct
7 Correct 13 ms 12632 KB Output is correct
8 Correct 11 ms 12632 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 1116 KB Output is correct
10 Correct 1 ms 1116 KB Output is correct
11 Correct 1 ms 1116 KB Output is correct
12 Correct 1 ms 1112 KB Output is correct
13 Correct 1 ms 1116 KB Output is correct
14 Correct 13 ms 12124 KB Output is correct
15 Correct 14 ms 12376 KB Output is correct
16 Correct 14 ms 12636 KB Output is correct
17 Correct 14 ms 12380 KB Output is correct
18 Correct 15 ms 13284 KB Output is correct
19 Correct 22 ms 14684 KB Output is correct
20 Correct 17 ms 14424 KB Output is correct
21 Correct 12 ms 12264 KB Output is correct
22 Correct 13 ms 12376 KB Output is correct
23 Correct 13 ms 12376 KB Output is correct
24 Correct 18 ms 14468 KB Output is correct
25 Correct 0 ms 344 KB Output is correct
26 Correct 1 ms 1116 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 11 ms 12636 KB Output is correct

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 1116 KB Output is correct
10 Correct 1 ms 1116 KB Output is correct
11 Correct 1 ms 1116 KB Output is correct
12 Correct 1 ms 1116 KB Output is correct
13 Correct 1 ms 1116 KB Output is correct
14 Correct 13 ms 12216 KB Output is correct
15 Correct 13 ms 12124 KB Output is correct
16 Correct 14 ms 12636 KB Output is correct
17 Correct 13 ms 12444 KB Output is correct
18 Correct 15 ms 13404 KB Output is correct
19 Correct 19 ms 14428 KB Output is correct
20 Correct 16 ms 14680 KB Output is correct
21 Correct 13 ms 12124 KB Output is correct
22 Correct 13 ms 12376 KB Output is correct
23 Correct 13 ms 12380 KB Output is correct
24 Runtime error 223 ms 262144 KB Execution killed with signal 9
25 Halted 0 ms 0 KB -