oj.uz

Submission #1062363

# Submission time Handle Problem Language Result Execution time Memory
1062363 2024-08-17T04:07:41 Z danielzhu Tracks in the Snow (BOI13_tracks) C++17
93.4375 / 100
 2000 ms 73560 KB 
#include <bits/stdc++.h>
using namespace std;
int H, W;
char grid[4001][4001];
vector<pair<int,int>> dir = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};

void bfs(set<pair<int,int>> &from, set<pair<int,int>> &to, char cc){
	while(!from.empty()){
			auto temp = from.begin();
			from.erase(from.begin());
			//from.erase({temp->first, temp->second});
			int x = temp->first, y = temp->second;
			for(auto [dx, dy] : dir){
				if(x+dx > -1 && x+dx < H && y+dy > -1 && y+dy < W && grid[x+dx][y+dy] != '.'){
					if(grid[x+dx][y+dy] != cc) to.insert({x+dx, y+dy});
					else from.insert({x+dx, y+dy});
					grid[x+dx][y+dy] = '.';
				}
			}
	}
}

int main(){
	cin>>H>>W;
	for(int i = 0; i < H; i++){
		string s; cin>>s;
		for(int j = 0; j < W; j++){
			grid[i][j] = s[j];
		}
	}
	int x = 0, y = 0, ans = 0;
	char cc = grid[0][0];
	set<pair<int,int>> F, R;
	if(cc == 'F') F.insert({0,0});
	else R.insert({0,0});
	grid[0][0] = '.';
	while(true){
		if(cc == 'F' && F.empty()) break;
		if(cc == 'R' && R.empty()) break;
		if(cc == 'F')
			bfs(F, R, cc);
		else if(cc == 'R')
			bfs(R, F, cc);
		ans++;
		if(cc == 'F') cc = 'R';
		else if(cc == 'R') cc = 'F';
	}
	cout<<ans<<endl;
	return 0;
}

Compilation message

tracks.cpp: In function 'int main()':
tracks.cpp:31:6: warning: unused variable 'x' [-Wunused-variable]
   31 |  int x = 0, y = 0, ans = 0;
      |      ^
tracks.cpp:31:13: warning: unused variable 'y' [-Wunused-variable]
   31 |  int x = 0, y = 0, ans = 0;
      |             ^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 2908 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 22 ms 3248 KB Output is correct
5 Correct 3 ms 2652 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 4 ms 2664 KB Output is correct
11 Correct 5 ms 2652 KB Output is correct
12 Correct 10 ms 2700 KB Output is correct
13 Correct 3 ms 2672 KB Output is correct
14 Correct 3 ms 2652 KB Output is correct
15 Correct 22 ms 2780 KB Output is correct
16 Correct 29 ms 3008 KB Output is correct
17 Correct 14 ms 2732 KB Output is correct
18 Correct 25 ms 3288 KB Output is correct

Subtask #2
63.4375 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 15192 KB Output is correct
2 Correct 78 ms 6748 KB Output is correct
3 Correct 412 ms 15952 KB Output is correct
4 Correct 96 ms 8788 KB Output is correct
5 Correct 244 ms 12900 KB Output is correct
6 Execution timed out 2033 ms 73560 KB Time limit exceeded
7 Correct 4 ms 15964 KB Output is correct
8 Correct 3 ms 15380 KB Output is correct
9 Correct 3 ms 604 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 3 ms 15708 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 74 ms 6764 KB Output is correct
14 Correct 54 ms 4696 KB Output is correct
15 Correct 24 ms 4696 KB Output is correct
16 Correct 39 ms 2652 KB Output is correct
17 Correct 195 ms 8784 KB Output is correct
18 Correct 96 ms 8784 KB Output is correct
19 Correct 96 ms 8788 KB Output is correct
20 Correct 89 ms 8796 KB Output is correct
21 Correct 252 ms 12884 KB Output is correct
22 Correct 236 ms 12912 KB Output is correct
23 Correct 371 ms 10832 KB Output is correct
24 Correct 209 ms 12884 KB Output is correct
25 Correct 384 ms 15968 KB Output is correct
26 Correct 1040 ms 15116 KB Output is correct
27 Correct 1514 ms 25376 KB Output is correct
28 Execution timed out 2076 ms 73424 KB Time limit exceeded
29 Execution timed out 2074 ms 64852 KB Time limit exceeded
30 Correct 1984 ms 58772 KB Output is correct
31 Correct 1388 ms 17508 KB Output is correct
32 Correct 1354 ms 20560 KB Output is correct