oj.uz

Submission #854113

# Submission time Handle Problem Language Result Execution time Memory
854113 2023-09-26T07:26:58 Z nhatvpm Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 547 ms 124000 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long;

void setIO(string name) {
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}



void solve(){
	int n,m,dx[]={0,0,1,-1},dy[]={1,-1,0,0};
	cin>>n>>m;
	string grid[n];
	for (int i=0;i<n;i++) cin>>grid[i];
	deque<pair<int,int>> q;
	vector<vector<int>> dis(n,vector<int>(m,0));
	dis[0][0]=1;
	int res=0;
	q.push_front({0,0});
	while (!q.empty()){
		int x=q.front().first,y=q.front().second;
		res=max(res,dis[x][y]);
		q.pop_front();
		for (int i=0;i<4;i++){
			int r=x+dx[i],c=y+dy[i];
			if (r>=0&&r<n&&c>=0&&c<m&&grid[r][c]!='.'&&dis[r][c]==0){
				int w=grid[r][c]!=grid[x][y]?1:0;
				
					dis[r][c]=dis[x][y]+w;
					if (w==1) q.push_back({r,c});
					else q.push_front({r,c});
				
				
			}
		}
	}
	cout<<res;
	
	
	
	
	
	
	
}


int main(){
	//setIO("");
	ios_base::sync_with_stdio(0);
    cin.tie(0);
	int tc=1;
	//cin>>tc;
	while (tc--){
		solve();
	}
}

Compilation message

tracks.cpp: In function 'void setIO(std::string)':
tracks.cpp:7:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tracks.cpp:8:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 1880 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 4 ms 1368 KB Output is correct
5 Correct 2 ms 856 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 2 ms 856 KB Output is correct
12 Correct 3 ms 856 KB Output is correct
13 Correct 2 ms 856 KB Output is correct
14 Correct 2 ms 856 KB Output is correct
15 Correct 6 ms 1880 KB Output is correct
16 Correct 8 ms 1880 KB Output is correct
17 Correct 5 ms 1880 KB Output is correct
18 Correct 4 ms 1368 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 856 KB Output is correct
2 Correct 25 ms 9820 KB Output is correct
3 Correct 150 ms 96760 KB Output is correct
4 Correct 39 ms 22860 KB Output is correct
5 Correct 79 ms 54352 KB Output is correct
6 Correct 515 ms 109788 KB Output is correct
7 Correct 2 ms 856 KB Output is correct
8 Correct 2 ms 860 KB Output is correct
9 Correct 2 ms 612 KB Output is correct
10 Correct 1 ms 600 KB Output is correct
11 Correct 2 ms 856 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 25 ms 9816 KB Output is correct
14 Correct 14 ms 5720 KB Output is correct
15 Correct 10 ms 6232 KB Output is correct
16 Correct 13 ms 4188 KB Output is correct
17 Correct 74 ms 24704 KB Output is correct
18 Correct 44 ms 24624 KB Output is correct
19 Correct 39 ms 22604 KB Output is correct
20 Correct 34 ms 21032 KB Output is correct
21 Correct 94 ms 56236 KB Output is correct
22 Correct 83 ms 54352 KB Output is correct
23 Correct 133 ms 46832 KB Output is correct
24 Correct 85 ms 54864 KB Output is correct
25 Correct 322 ms 96484 KB Output is correct
26 Correct 531 ms 124000 KB Output is correct
27 Correct 484 ms 114876 KB Output is correct
28 Correct 547 ms 109960 KB Output is correct
29 Correct 506 ms 107436 KB Output is correct
30 Correct 514 ms 111920 KB Output is correct
31 Correct 319 ms 62016 KB Output is correct
32 Correct 476 ms 113572 KB Output is correct