oj.uz

Submission #943263

# Submission time Handle Problem Language Result Execution time Memory
943263 2024-03-11T09:45:15 Z WongYiKai Portals (BOI14_portals) C++14
70 / 100
 233 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(1,j);
	for (int i=1;i<=r;i++){
		if (grid[i][1]==0) {
			left[a(i,1)]=a(i,2);
			up[a(i,1)]=a(i+1,1);
		}
		else {
			left[a(i,1)]=a(i,1);
			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+1);
				up[a(i,j)] = a(i+1,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,j);
	for (int i=r;i>=1;i--){
		if (grid[i][c]==0) {
			right[a(i,c)]=a(i,c-1);
			down[a(i,c)]=a(i-1,c);
		}
		else {
			right[a(i,c)]=a(i,c);
			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-1);
				down[a(i,j)] = a(i-1,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],max(0LL,dist[x])+1});
			adj[x].push_back({down[x],max(0LL,dist[x])+1});
			adj[x].push_back({up[x],max(0LL,dist[x])+1});
			adj[x].push_back({right[x],max(0LL,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 (nx>a(r,c)) continue;
			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:252:15: warning: 'e' may be used uninitialized in this function [-Wmaybe-uninitialized]
  252 |  cout << dis[e];
      |               ^

Subtask #1
11.0 / 11.0

# 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 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 352 KB Output is correct
8 Correct 1 ms 356 KB Output is correct
9 Correct 0 ms 356 KB Output is correct
10 Correct 1 ms 360 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 360 KB Output is correct
2 Correct 0 ms 360 KB Output is correct
3 Correct 0 ms 360 KB Output is correct
4 Correct 0 ms 360 KB Output is correct
5 Correct 0 ms 360 KB Output is correct
6 Correct 1 ms 360 KB Output is correct
7 Correct 1 ms 360 KB Output is correct
8 Correct 0 ms 360 KB Output is correct
9 Correct 1 ms 1128 KB Output is correct
10 Correct 1 ms 1232 KB Output is correct
11 Correct 1 ms 1124 KB Output is correct
12 Correct 1 ms 1124 KB Output is correct
13 Correct 1 ms 1128 KB Output is correct
14 Correct 0 ms 360 KB Output is correct
15 Correct 1 ms 1120 KB Output is correct
16 Correct 0 ms 356 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 360 KB Output is correct
2 Correct 1 ms 360 KB Output is correct
3 Correct 0 ms 356 KB Output is correct
4 Correct 1 ms 464 KB Output is correct
5 Correct 13 ms 12076 KB Output is correct
6 Correct 14 ms 12384 KB Output is correct
7 Correct 14 ms 12640 KB Output is correct
8 Correct 12 ms 12640 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 352 KB Output is correct
2 Correct 0 ms 352 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 352 KB Output is correct
5 Correct 0 ms 352 KB Output is correct
6 Correct 0 ms 352 KB Output is correct
7 Correct 1 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 12124 KB Output is correct
15 Correct 14 ms 12412 KB Output is correct
16 Correct 14 ms 12636 KB Output is correct
17 Correct 13 ms 12636 KB Output is correct
18 Correct 16 ms 13312 KB Output is correct
19 Correct 18 ms 14684 KB Output is correct
20 Correct 17 ms 14652 KB Output is correct
21 Correct 13 ms 12124 KB Output is correct
22 Correct 13 ms 12120 KB Output is correct
23 Correct 14 ms 12380 KB Output is correct
24 Correct 16 ms 14428 KB Output is correct
25 Correct 1 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 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 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 1 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 13 ms 12124 KB Output is correct
15 Correct 13 ms 12380 KB Output is correct
16 Correct 14 ms 12508 KB Output is correct
17 Correct 13 ms 12636 KB Output is correct
18 Correct 16 ms 13392 KB Output is correct
19 Correct 18 ms 14688 KB Output is correct
20 Correct 18 ms 14436 KB Output is correct
21 Correct 13 ms 12136 KB Output is correct
22 Correct 13 ms 12136 KB Output is correct
23 Correct 13 ms 12392 KB Output is correct
24 Runtime error 233 ms 262144 KB Execution killed with signal 9
25 Halted 0 ms 0 KB -