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Submission #597572

# Submission time Handle Problem Language Result Execution time Memory
597572 2022-07-16T10:38:42 Z l_reho Mecho (IOI09_mecho) C++14
84 / 100
 216 ms 4072 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long

int N, S;

vector<string> V;
vector<vector<int>> P;

int dirs[4][2] = {{1, 0},{0, 1},{-1, 0},{0, -1}};

struct info{
	int r, c, d;
	info(){}
	
	info(int _r, int _c, int _d): r(_r), c(_c), d(_d) {}
};

void precompute(vector<pair<int, int>> starts){
	
	queue<info> q;
	
	for(int i = 0; i < (int)starts.size(); i++){
		q.push(info(starts[i].first, starts[i].second, 0));
		P[starts[i].first][starts[i].second] = 0;
	}
	
	while(!q.empty()){
		info curr = q.front();
		q.pop();
		
		int r = curr.r;
		int c = curr.c;
		int depth = curr.d;
		
		for(int i = 0; i < 4; i++){
			int nr = r + dirs[i][0];
			int nc = c + dirs[i][1];
			
			if(nr < 0 || nr >= N || nc < 0 || nc >= N || V[nr][nc] != 'G' || P[nr][nc] != INT_MAX) continue;
			 
			P[nr][nc] = depth+1;
			
			q.push(info(nr, nc, depth+1));
			
		}
		
	}
	
	
}

bool solver(int r, int c, int dr, int dc, int l){
	
	queue<info> q;
	
	q.push(info(r, c, l+1));	
	vector<vector<bool>> visited(N, vector<bool>(N, false));
	
	while(!q.empty()){
		info curr = q.front();
		q.pop();
		
		int r = curr.r;
		int c = curr.c;
		int depth = curr.d;
			
		// cout<<"DEBUG-->"<<l<<" "<<r<<" "<<c<<endl;
		visited[r][c] = true;
		
		for(int i = 0; i < 4; i++){
			int nr = r + dirs[i][0];
			int nc = c + dirs[i][1];
			
			if(nr < 0 || nr >= N || nc < 0 || nc >= N || (V[nr][nc] != 'G' && V[nr][nc] != 'D') || visited[nr][nc] || P[nr][nc] <= (l + (int)((depth-l)/S))) continue;
	
			visited[nr][nc] = true;
	
			q.push(info(nr, nc, depth+1));
				
		}
		
	}
	
		
	return visited[dr][dc];
}

void solve(){
	cin>>N>>S;
	
	V.assign(N, "");
	P.assign(N, vector<int>(N, INT_MAX));
	
	vector<pair<int, int>> starts;
	int sr, sc, dr, dc;
	for(int i = 0; i < N; i++){
		cin>>V[i];
		for(int j = 0; j < N; j++) 
			if(V[i][j] == 'H') starts.push_back({i, j});
			else if(V[i][j] == 'M') sr = i, sc = j;
			else if(V[i][j] == 'D') dr = i, dc = j;
			
	}
	
	precompute(starts);

	int low = 0;
	int high = N*N;
	int ans = -1;

	while(low <= high){
		int mid = low + (high - low)/2;

		if(solver(sr, sc, dr, dc, mid)){
			ans = mid;
			low = mid+1;
		}else high = mid-1;
		
	}
	
	cout<<ans<<endl;
	
}

int main(){
	solve();
}

Compilation message

mecho.cpp: In function 'void solve()':
mecho.cpp:116:12: warning: 'dr' may be used uninitialized in this function [-Wmaybe-uninitialized]
  116 |   if(solver(sr, sc, dr, dc, mid)){
      |      ~~~~~~^~~~~~~~~~~~~~~~~~~~~
mecho.cpp:116:12: warning: 'dc' may be used uninitialized in this function [-Wmaybe-uninitialized]
mecho.cpp:116:12: warning: 'sr' may be used uninitialized in this function [-Wmaybe-uninitialized]
mecho.cpp:116:12: warning: 'sc' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 93 ms 3796 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Incorrect 1 ms 212 KB Output isn't correct
13 Incorrect 1 ms 212 KB Output isn't correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 0 ms 212 KB Output is correct
22 Correct 0 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 212 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 7 ms 980 KB Output is correct
34 Correct 7 ms 976 KB Output is correct
35 Correct 27 ms 1008 KB Output is correct
36 Correct 9 ms 1108 KB Output is correct
37 Correct 8 ms 1108 KB Output is correct
38 Correct 33 ms 1176 KB Output is correct
39 Correct 9 ms 1384 KB Output is correct
40 Correct 10 ms 1340 KB Output is correct
41 Correct 42 ms 1376 KB Output is correct
42 Correct 13 ms 1752 KB Output is correct
43 Correct 13 ms 1844 KB Output is correct
44 Correct 53 ms 1836 KB Output is correct
45 Correct 15 ms 2052 KB Output is correct
46 Correct 16 ms 2004 KB Output is correct
47 Correct 76 ms 2096 KB Output is correct
48 Correct 16 ms 2368 KB Output is correct
49 Correct 18 ms 2492 KB Output is correct
50 Correct 74 ms 2388 KB Output is correct
51 Correct 18 ms 2696 KB Output is correct
52 Correct 22 ms 2644 KB Output is correct
53 Correct 99 ms 2696 KB Output is correct
54 Correct 25 ms 2924 KB Output is correct
55 Correct 26 ms 2976 KB Output is correct
56 Correct 105 ms 3016 KB Output is correct
57 Correct 27 ms 3368 KB Output is correct
58 Correct 29 ms 3364 KB Output is correct
59 Correct 138 ms 3236 KB Output is correct
60 Correct 31 ms 3736 KB Output is correct
61 Correct 29 ms 3668 KB Output is correct
62 Correct 132 ms 3696 KB Output is correct
63 Correct 124 ms 3728 KB Output is correct
64 Correct 216 ms 3732 KB Output is correct
65 Correct 163 ms 3736 KB Output is correct
66 Correct 128 ms 3668 KB Output is correct
67 Correct 131 ms 3628 KB Output is correct
68 Correct 66 ms 3756 KB Output is correct
69 Correct 56 ms 3732 KB Output is correct
70 Correct 43 ms 3744 KB Output is correct
71 Correct 48 ms 3672 KB Output is correct
72 Incorrect 42 ms 3648 KB Output isn't correct
73 Incorrect 103 ms 4060 KB Output isn't correct
74 Correct 63 ms 4060 KB Output is correct
75 Correct 78 ms 3992 KB Output is correct
76 Correct 66 ms 4064 KB Output is correct
77 Correct 65 ms 4072 KB Output is correct
78 Correct 77 ms 4012 KB Output is correct
79 Correct 63 ms 4012 KB Output is correct
80 Correct 80 ms 4012 KB Output is correct
81 Correct 97 ms 3888 KB Output is correct
82 Correct 65 ms 4016 KB Output is correct
83 Correct 84 ms 3924 KB Output is correct
84 Correct 82 ms 3968 KB Output is correct
85 Correct 92 ms 3832 KB Output is correct
86 Correct 87 ms 3860 KB Output is correct
87 Correct 81 ms 3944 KB Output is correct
88 Correct 87 ms 3864 KB Output is correct
89 Correct 89 ms 3860 KB Output is correct
90 Correct 90 ms 3868 KB Output is correct
91 Correct 92 ms 3880 KB Output is correct
92 Correct 101 ms 3860 KB Output is correct