oj.uz

Submission #715613

# Submission time Handle Problem Language Result Execution time Memory
715613 2023-03-27T10:11:48 Z Iliya_ Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 803 ms 160216 KB 
// IN THE NAME OF GOD
#include<bits/stdc++.h>
#define endl '\n'
#define file_reading freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);
#define flush cout.flush();
using namespace std;
typedef long long ll;
typedef long double dll;
typedef unsigned long long ull;
 
const int N = 4e3+5, inf = 1e9; 
int dat[N][N], dist[N][N], ans, must; 
deque<pair<int,int>> q; 
 
void dij(int n, int m){
	for(int i=1; i<=n; i++) for(int j=1; j<=m; j++) dist[i][j] = inf; 
	dist[n][m] = 1;
	q.push_front({n,m}); 
	while(q.size()){
		int x = q.front().first, y = q.front().second; q.pop_front();
		ans = max(ans,dist[x][y]);
		if (x-1 >= 1 && dat[x][y] == dat[x-1][y] && dist[x-1][y] >= inf) dist[x-1][y] = dist[x][y], q.push_front({x-1,y}); 
		if (x+1 <= n && dat[x][y] == dat[x+1][y] && dist[x+1][y] >= inf) dist[x+1][y] = dist[x][y], q.push_front({x+1,y}); 
		if (y-1 >= 1 && dat[x][y] == dat[x][y-1] && dist[x][y-1] >= inf) dist[x][y-1] = dist[x][y], q.push_front({x,y-1}); 
		if (y+1 <= m && dat[x][y] == dat[x][y+1] && dist[x][y+1] >= inf) dist[x][y+1] = dist[x][y], q.push_front({x,y+1}); 
		if (x-1 >= 1 && dat[x][y] != dat[x-1][y] && dat[x-1][y] && dist[x-1][y] >= inf) dist[x-1][y] = dist[x][y]+1, q.push_back({x-1,y}); 
		if (x+1 <= n && dat[x][y] != dat[x+1][y] && dat[x+1][y] && dist[x+1][y] >= inf) dist[x+1][y] = dist[x][y]+1, q.push_back({x+1,y}); 
		if (y-1 >= 1 && dat[x][y] != dat[x][y-1] && dat[x][y-1] && dist[x][y-1] >= inf) dist[x][y-1] = dist[x][y]+1, q.push_back({x,y-1}); 
		if (y+1 <= m && dat[x][y] != dat[x][y+1] && dat[x][y+1] && dist[x][y+1] >= inf) dist[x][y+1] = dist[x][y]+1, q.push_back({x,y+1}); 
	}
}
 
void solve(){  
	int n,m; cin >> n >> m; 
	for(int i=1; i<=n; i++){
		for(int j=1; j<=m; j++){
			char g; cin >> g; 
			if (g == '.') dat[i][j] = 0; 
			else if (g == 'R') dat[i][j] = 1, must++; 
			else dat[i][j] = 2, must++; 
		}
	}
	if (must == 0){cout << 0 << endl; return;}
	dij(n,m); 
	cout << ans << endl; 
}
 
int32_t main(){
	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	int t; t=1; //cin >> t;
	while(t--){solve();}
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 6228 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 10 ms 5716 KB Output is correct
5 Correct 4 ms 3284 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 852 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct
10 Correct 4 ms 2772 KB Output is correct
11 Correct 4 ms 2260 KB Output is correct
12 Correct 8 ms 3284 KB Output is correct
13 Correct 4 ms 3284 KB Output is correct
14 Correct 4 ms 3284 KB Output is correct
15 Correct 16 ms 6328 KB Output is correct
16 Correct 20 ms 6244 KB Output is correct
17 Correct 13 ms 5972 KB Output is correct
18 Correct 12 ms 5716 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 31476 KB Output is correct
2 Correct 65 ms 22608 KB Output is correct
3 Correct 389 ms 125692 KB Output is correct
4 Correct 111 ms 44748 KB Output is correct
5 Correct 237 ms 94396 KB Output is correct
6 Correct 801 ms 138348 KB Output is correct
7 Correct 14 ms 32820 KB Output is correct
8 Correct 15 ms 31452 KB Output is correct
9 Correct 3 ms 836 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 13 ms 32212 KB Output is correct
12 Correct 1 ms 1620 KB Output is correct
13 Correct 66 ms 22608 KB Output is correct
14 Correct 38 ms 14656 KB Output is correct
15 Correct 38 ms 16204 KB Output is correct
16 Correct 31 ms 8444 KB Output is correct
17 Correct 158 ms 48232 KB Output is correct
18 Correct 152 ms 47584 KB Output is correct
19 Correct 125 ms 44680 KB Output is correct
20 Correct 95 ms 41256 KB Output is correct
21 Correct 246 ms 97528 KB Output is correct
22 Correct 256 ms 94364 KB Output is correct
23 Correct 302 ms 78760 KB Output is correct
24 Correct 232 ms 96344 KB Output is correct
25 Correct 650 ms 125716 KB Output is correct
26 Correct 467 ms 160216 KB Output is correct
27 Correct 583 ms 145776 KB Output is correct
28 Correct 803 ms 138320 KB Output is correct
29 Correct 801 ms 136952 KB Output is correct
30 Correct 688 ms 140464 KB Output is correct
31 Correct 787 ms 101156 KB Output is correct
32 Correct 549 ms 146204 KB Output is correct