oj.uz

Submission #30904

# Submission time Handle Problem Language Result Execution time Memory
30904 2017-07-31T15:29:41 Z Navick Portals (BOI14_portals) C++14
70 / 100
 1000 ms 93604 KB 
#include <bits/stdc++.h>
#define F first
#define S second
#define pii pair<int, int>
#define pb push_back
#define end EEE

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 1010, INF = 1e9;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

//down,right,up,left.

int d[N][N], dis[N][N];
pii start, end, que[N * N], nex[4][N][N];
bool mp[N][N];
char sr[N];

set<pair<int, pii> > s;

int main(){
	int n, m; scanf("%d %d",&n ,&m);
	for(int i=1; i<=n; i++){
		scanf("%s", sr);
		for(int j=1; j<=m; j++){
			if(sr[j - 1] == '.'){
				mp[i][j] = true;
				d[i][j] = INF;
			}
			else if(sr[j - 1] == 'S'){
				mp[i][j] = true;
				d[i][j] = INF;
				start = {i, j};
			}else if(sr[j - 1] == 'C'){
				mp[i][j] = true; 
				d[i][j] = INF;
				end = {i, j};
			}
		}
	}

	int st = 0, en = 0;

	for(int i=0; i<=n+1; i++)
		for(int j=0; j<=m+1; j++)
			if(!mp[i][j])
				que[en++] = {i, j};

	while(en - st){
		pii v = que[st++];
		int x = v.F, y = v.S;
		for(int i=0; i<4; i++){
			int nx = x + dx[i], ny = y + dy[i];
			if(nx < 0 || nx > n + 1 || ny < 0 || ny > m + 1)continue;
			if(d[nx][ny] == INF){
				d[nx][ny] = d[x][y] + 1;
				que[en++] = {nx, ny};
			}
		}
	}

	for(int i=n; i>=1; i--)
		for(int j=m; j>=1; j--){
			
			if(!mp[i][j])continue;
			
			for(int c=0; c<2; c++){
				int nx = i + dx[c], ny = j + dy[c];
				if(nx < 0 || nx > n + 1 || ny < 0 || ny > m + 1)continue;
				if(mp[nx][ny])
					nex[c][i][j] = nex[c][nx][ny];
				else nex[c][i][j] = {i, j};
			}
		}

	for(int i=1; i<=n; i++){
		for(int j=1; j<=m; j++){
			
			if(!mp[i][j])continue;

			for(int c=2; c<4; c++){
				int nx = i + dx[c], ny = j + dy[c];
				if(nx < 0 || nx > n + 1 || ny < 0 || ny > m + 1)continue;
				if(mp[nx][ny])
					nex[c][i][j] = nex[c][nx][ny];
				else nex[c][i][j] = {i, j};
			}
		}
	}

	//dijkstra :)

	for(int i=1; i<=n; i++)
		for(int j=1; j<=m; j++){
			if(!mp[i][j])continue;
			dis[i][j] = INF;
			if(i != start.F || j != start.S)
				s.insert({dis[i][j], {i, j}});
		}

	dis[start.F][start.S] = 0;
	s.insert({0, start});


	while(!s.empty()){
		auto X = *(s.begin());
		s.erase(s.begin());
		int res = X.F;
		int x = X.S.F, y = X.S.S;
		if(x == end.F && y == end.S)
			return printf("%d\n", res), 0;
		for(int i=0; i<4; i++){
			int nx = x + dx[i], ny = y + dy[i];
			if(nx < 0 || nx > n + 1 || ny < 0 || ny > m + 1)continue;
			if(!mp[nx][ny])continue;
			if(dis[nx][ny] > res + 1){
				s.erase({dis[nx][ny], {nx, ny}});
				dis[nx][ny] = res + 1;
				s.insert({dis[nx][ny], {nx, ny}});
			}
		}

		for(int i=0; i<4; i++){
			int nx = nex[i][x][y].F, ny = nex[i][x][y].S;
			if(dis[nx][ny] > res + d[x][y]){
				s.erase({dis[nx][ny], {nx, ny}});
				dis[nx][ny] = res + d[x][y];
				s.insert({dis[nx][ny], {nx, ny}});
			}
		}
	}
}

Compilation message

portals.cpp: In function 'int main()':
portals.cpp:27:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n, m; scanf("%d %d",&n ,&m);
                                 ^
portals.cpp:29:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", sr);
                  ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 50836 KB Output is correct
2 Correct 0 ms 50836 KB Output is correct
3 Correct 0 ms 50836 KB Output is correct
4 Correct 0 ms 50836 KB Output is correct
5 Correct 0 ms 50836 KB Output is correct
6 Correct 0 ms 50836 KB Output is correct
7 Correct 0 ms 50836 KB Output is correct
8 Correct 0 ms 50836 KB Output is correct
9 Correct 0 ms 50836 KB Output is correct
10 Correct 0 ms 50836 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 50836 KB Output is correct
2 Correct 0 ms 50836 KB Output is correct
3 Correct 0 ms 50836 KB Output is correct
4 Correct 0 ms 50836 KB Output is correct
5 Correct 0 ms 50836 KB Output is correct
6 Correct 0 ms 50836 KB Output is correct
7 Correct 0 ms 50836 KB Output is correct
8 Correct 0 ms 50836 KB Output is correct
9 Correct 3 ms 50968 KB Output is correct
10 Correct 0 ms 50968 KB Output is correct
11 Correct 0 ms 50968 KB Output is correct
12 Correct 0 ms 50968 KB Output is correct
13 Correct 0 ms 50968 KB Output is correct
14 Correct 0 ms 50836 KB Output is correct
15 Correct 0 ms 50968 KB Output is correct
16 Correct 0 ms 50836 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 50836 KB Output is correct
2 Correct 0 ms 50836 KB Output is correct
3 Correct 0 ms 50836 KB Output is correct
4 Correct 0 ms 50836 KB Output is correct
5 Correct 23 ms 52288 KB Output is correct
6 Correct 29 ms 52288 KB Output is correct
7 Correct 23 ms 52420 KB Output is correct
8 Correct 19 ms 52552 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 50836 KB Output is correct
2 Correct 0 ms 50836 KB Output is correct
3 Correct 0 ms 50836 KB Output is correct
4 Correct 0 ms 50836 KB Output is correct
5 Correct 0 ms 50836 KB Output is correct
6 Correct 0 ms 50836 KB Output is correct
7 Correct 0 ms 50836 KB Output is correct
8 Correct 0 ms 50836 KB Output is correct
9 Correct 0 ms 50968 KB Output is correct
10 Correct 0 ms 50968 KB Output is correct
11 Correct 0 ms 50968 KB Output is correct
12 Correct 0 ms 50968 KB Output is correct
13 Correct 0 ms 50968 KB Output is correct
14 Correct 16 ms 52288 KB Output is correct
15 Correct 23 ms 52288 KB Output is correct
16 Correct 33 ms 52420 KB Output is correct
17 Correct 29 ms 52420 KB Output is correct
18 Correct 29 ms 52816 KB Output is correct
19 Correct 13 ms 53344 KB Output is correct
20 Correct 29 ms 53344 KB Output is correct
21 Correct 19 ms 52288 KB Output is correct
22 Correct 19 ms 52288 KB Output is correct
23 Correct 19 ms 52420 KB Output is correct
24 Correct 46 ms 53344 KB Output is correct
25 Correct 0 ms 50836 KB Output is correct
26 Correct 3 ms 50968 KB Output is correct
27 Correct 0 ms 50836 KB Output is correct
28 Correct 26 ms 52552 KB Output is correct

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 50836 KB Output is correct
2 Correct 0 ms 50836 KB Output is correct
3 Correct 0 ms 50836 KB Output is correct
4 Correct 0 ms 50836 KB Output is correct
5 Correct 0 ms 50836 KB Output is correct
6 Correct 0 ms 50836 KB Output is correct
7 Correct 0 ms 50836 KB Output is correct
8 Correct 0 ms 50836 KB Output is correct
9 Correct 3 ms 50968 KB Output is correct
10 Correct 0 ms 50968 KB Output is correct
11 Correct 0 ms 50968 KB Output is correct
12 Correct 0 ms 50968 KB Output is correct
13 Correct 0 ms 50968 KB Output is correct
14 Correct 26 ms 52288 KB Output is correct
15 Correct 23 ms 52288 KB Output is correct
16 Correct 29 ms 52420 KB Output is correct
17 Correct 29 ms 52420 KB Output is correct
18 Correct 23 ms 52816 KB Output is correct
19 Correct 16 ms 53344 KB Output is correct
20 Correct 36 ms 53344 KB Output is correct
21 Correct 19 ms 52288 KB Output is correct
22 Correct 26 ms 52288 KB Output is correct
23 Correct 23 ms 52420 KB Output is correct
24 Execution timed out 1000 ms 93604 KB Execution timed out
25 Halted 0 ms 0 KB -