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Submission #519415

# Submission time Handle Problem Language Result Execution time Memory
519415 2022-01-26T10:35:23 Z MODDI Mecho (IOI09_mecho) C++14
49 / 100
 222 ms 6420 KB 
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vl vector<ll>
#define mp make_pair
#define pb push_back
using namespace std;
int n, s,sx, sy, ex, ey;
const int Nmax = 1000;
char mat[Nmax][Nmax];
int dist[Nmax][Nmax];
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};
vector<pii> hives;
class state{
	public:
		int x;
		int y;
		int steps_made;
		int cur_minute;
};
bool in_range(int i, int j){
	if(i >= 0 && j >= 0 && i < n && j < n)
		return true;
	return false;
}
void calculate_dist(){
	queue<vector<pii> > q;
	q.push(hives);
	while(!q.empty()){
		vector<pii> current = q.front(); q.pop();
		vector<pii> next_current;
		for(int i = 0; i < current.size(); i++){
			int x = current[i].first, y = current[i].second;
			for(int dir = 0; dir < 4; dir++){
				int nx = x + dx[dir], ny = y + dy[dir];
				if(in_range(nx, ny) && mat[nx][ny] != 'T' && dist[nx][ny] == -1){
					dist[nx][ny] = 1 + dist[x][y];
					next_current.pb(mp(nx,ny));
				}
			}
		}
		if(next_current.size() > 0)
			q.push(next_current);
	}
}
bool solve(int minutes){
	queue<state> q;
	q.push({sx,sy,0,minutes+1});
	bool finished = false;
	bool vis[801][801];
	memset(vis, false, sizeof(vis));
	vis[sx][sy] = true;
	while(!q.empty()){
		state current = q.front(); q.pop();
		int x = current.x, y = current.y, steps_made = current.steps_made, cur_minute = current.cur_minute;
		//cout<<x<<" "<<y<<" "<<steps_made<<" "<<cur_minute<<endl;
		if(steps_made == s){
			steps_made = 0;
			cur_minute++;
		}
			
		for(int dir = 0; dir < 4; dir++){
			int nx = x + dx[dir], ny = y + dy[dir];
			//cout<<dist[nx][ny]<<" "<<cur_minute<<endl;
			if(in_range(nx,ny) && mat[nx][ny] != 'T' &&  !vis[nx][ny] && dist[nx][ny] >= cur_minute){
				if(dist[nx][ny] == cur_minute && steps_made + 1 == s)
					continue;
				if(nx == ex && ny == ey){
					finished = true;
					break;
				}
				vis[nx][ny] = true;
				q.push({nx, ny, steps_made + 1, cur_minute});
			}
		}
		if(finished)
			break;
	}
	return finished;
}
int main(){
	cin>>n>>s;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			cin>>mat[i][j];
			if(mat[i][j] == 'M')
				sx = i, sy = j;
			if(mat[i][j] == 'D')
				ex = i, ey = j;
			if(mat[i][j] == 'H')
				hives.pb(mp(i,j));
		}
	}
	memset(dist, -1, sizeof(dist));
	for(int i = 0; i < hives.size(); i++)
		dist[hives[i].first][hives[i].second] = 0;
		
	calculate_dist(); 
	int l = 0, r = 10000, solution=-1;
	while(l <= r){
		int mid = (l + r) / 2;
		bool sol = solve(mid);
		if(sol){
			solution = mid;
			l = mid + 1;
		}
		else
			r = mid - 1;
	}
	cout<<solution<<endl;
}

Compilation message

mecho.cpp: In function 'void calculate_dist()':
mecho.cpp:35:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   for(int i = 0; i < current.size(); i++){
      |                  ~~^~~~~~~~~~~~~~~~
mecho.cpp: In function 'int main()':
mecho.cpp:98:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |  for(int i = 0; i < hives.size(); i++)
      |                 ~~^~~~~~~~~~~~~~

Subtask #1
49.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4812 KB Output is correct
2 Incorrect 2 ms 4812 KB Output isn't correct
3 Correct 2 ms 4812 KB Output is correct
4 Incorrect 2 ms 4812 KB Output isn't correct
5 Correct 2 ms 4812 KB Output is correct
6 Incorrect 3 ms 4812 KB Output isn't correct
7 Incorrect 115 ms 5680 KB Output isn't correct
8 Correct 2 ms 4812 KB Output is correct
9 Correct 3 ms 4812 KB Output is correct
10 Correct 2 ms 4812 KB Output is correct
11 Correct 3 ms 4812 KB Output is correct
12 Incorrect 3 ms 4808 KB Output isn't correct
13 Incorrect 3 ms 4836 KB Output isn't correct
14 Correct 3 ms 4812 KB Output is correct
15 Correct 3 ms 4812 KB Output is correct
16 Correct 3 ms 4812 KB Output is correct
17 Correct 2 ms 4812 KB Output is correct
18 Correct 3 ms 4812 KB Output is correct
19 Correct 3 ms 4812 KB Output is correct
20 Correct 2 ms 4812 KB Output is correct
21 Correct 3 ms 4812 KB Output is correct
22 Correct 3 ms 4812 KB Output is correct
23 Correct 3 ms 4812 KB Output is correct
24 Correct 3 ms 4812 KB Output is correct
25 Correct 3 ms 4812 KB Output is correct
26 Correct 3 ms 4812 KB Output is correct
27 Correct 3 ms 4812 KB Output is correct
28 Correct 3 ms 4812 KB Output is correct
29 Correct 3 ms 4812 KB Output is correct
30 Correct 3 ms 4812 KB Output is correct
31 Correct 3 ms 4812 KB Output is correct
32 Correct 3 ms 4812 KB Output is correct
33 Incorrect 14 ms 5100 KB Output isn't correct
34 Incorrect 13 ms 5068 KB Output isn't correct
35 Correct 27 ms 5252 KB Output is correct
36 Incorrect 16 ms 5188 KB Output isn't correct
37 Incorrect 16 ms 5156 KB Output isn't correct
38 Correct 34 ms 5200 KB Output is correct
39 Incorrect 21 ms 5196 KB Output isn't correct
40 Incorrect 19 ms 5196 KB Output isn't correct
41 Correct 42 ms 5324 KB Output is correct
42 Incorrect 23 ms 5188 KB Output isn't correct
43 Incorrect 24 ms 5204 KB Output isn't correct
44 Correct 51 ms 5380 KB Output is correct
45 Incorrect 28 ms 5324 KB Output isn't correct
46 Incorrect 28 ms 5316 KB Output isn't correct
47 Correct 61 ms 5332 KB Output is correct
48 Incorrect 34 ms 5284 KB Output isn't correct
49 Incorrect 37 ms 5288 KB Output isn't correct
50 Correct 93 ms 5492 KB Output is correct
51 Incorrect 38 ms 5436 KB Output isn't correct
52 Incorrect 37 ms 5444 KB Output isn't correct
53 Correct 91 ms 5544 KB Output is correct
54 Incorrect 44 ms 5384 KB Output isn't correct
55 Incorrect 44 ms 5464 KB Output isn't correct
56 Correct 122 ms 5480 KB Output is correct
57 Incorrect 56 ms 5536 KB Output isn't correct
58 Incorrect 48 ms 5480 KB Output isn't correct
59 Correct 118 ms 5640 KB Output is correct
60 Incorrect 57 ms 5500 KB Output isn't correct
61 Incorrect 62 ms 5488 KB Output isn't correct
62 Correct 141 ms 5692 KB Output is correct
63 Correct 122 ms 5572 KB Output is correct
64 Correct 222 ms 5664 KB Output is correct
65 Correct 185 ms 5680 KB Output is correct
66 Correct 143 ms 5684 KB Output is correct
67 Correct 134 ms 5572 KB Output is correct
68 Correct 68 ms 5624 KB Output is correct
69 Correct 84 ms 5732 KB Output is correct
70 Correct 65 ms 5656 KB Output is correct
71 Correct 63 ms 5632 KB Output is correct
72 Incorrect 53 ms 5620 KB Output isn't correct
73 Incorrect 65 ms 6328 KB Output isn't correct
74 Correct 78 ms 6368 KB Output is correct
75 Correct 90 ms 6320 KB Output is correct
76 Correct 102 ms 6420 KB Output is correct
77 Correct 84 ms 6392 KB Output is correct
78 Correct 103 ms 5988 KB Output is correct
79 Correct 81 ms 6040 KB Output is correct
80 Correct 81 ms 5980 KB Output is correct
81 Correct 99 ms 6088 KB Output is correct
82 Correct 110 ms 5940 KB Output is correct
83 Correct 99 ms 5992 KB Output is correct
84 Correct 89 ms 5996 KB Output is correct
85 Correct 97 ms 5932 KB Output is correct
86 Correct 100 ms 6060 KB Output is correct
87 Correct 103 ms 6000 KB Output is correct
88 Correct 100 ms 5976 KB Output is correct
89 Correct 109 ms 5908 KB Output is correct
90 Correct 124 ms 5920 KB Output is correct
91 Correct 103 ms 6000 KB Output is correct
92 Correct 108 ms 5996 KB Output is correct