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Submission #103680

# Submission time Handle Problem Language Result Execution time Memory
103680 2019-04-02T04:14:04 Z tugushka Mecho (IOI09_mecho) C++14
57 / 100
 1000 ms 66560 KB 
#include<bits/stdc++.h>
#define mp make_pair
#define pb push_back
using namespace std;

using pii = pair < short, short >;
const int N = 805;
const int dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1};

char a[N][N];
pii mecho, home;
int n, s, hive[N][N];
bool used[N][N];

void hive_bfs(){
	memset( hive, 11, sizeof(hive) );
	queue < pii > q;
	for(int i = 0 ; i < n ; i++) for(int j = 0 ; j < n ; j++){
		if( a[i][j] == 'H' ){
			q.push( mp( i, j ) );
			hive[i][j] = 0;
		}
	}

	int dis = 0;
	while( !q.empty() ){
		dis += s;
		int sz = q.size();
		while( sz-- ){
			int x, y;
			tie(x, y) = q.front();
			q.pop();
			for(int i = 0 ; i < 4 ; i++){
				int tx = x+dx[i], ty = y+dy[i];
				if( tx < 0 || ty < 0 || tx >= n || ty >= n ) continue;
				if( a[tx][ty] == 'G' && hive[tx][ty] > 2e6 ){
					hive[tx][ty] = dis;
					q.push( mp( tx, ty ) );
				}
			}
		}
	}

	/*
	for(int i = 0 ; i < n ; i++){
		for(int j = 0 ; j < n ; j++){
			if( hive[i][j] > 2e6 ) printf("@@ ");
			else printf("%2d ", hive[i][j]);
		}
		printf("\n");
	}
	*/
}

bool mecho_bfs(int start_time){
	memset( used, 0, sizeof(used) );

	queue < pii > q;
	q.push( mecho );

	int dis = start_time;
	while( !q.empty() ){
		dis++;
		// cout << "dis " << dis << " : ";

		int sz = q.size();
		while( sz-- ){
			short x, y;
			tie(x, y) = q.front();
			q.pop();
			for(int i = 0 ; i < 4 ; i++){
				short tx = x+dx[i], ty = y+dy[i];
				if( tx < 0 || ty < 0 || tx >= n || ty >= n ) continue;
				if( !used[tx][ty] && a[tx][ty] == 'G' && hive[tx][ty] > dis ){
					used[tx][ty] = 1;
					if( used[ home.first ][ home.second ] ){
						return true;
					}
					// cout << "( " << tx << ',' << ty << " ), ";
					q.push( mp( tx, ty ) );
				}
			}
		}
		// cout << endl;
	}

	return used[ home.first ][ home.second ];
}

int main(){
	scanf("%d %d", &n, &s);
	for(int i = 0 ; i < n ; i++){
		scanf("%s", a[i]);
	}
	hive_bfs();
	for(int i = 0 ; i < n ; i++) for(int j = 0 ; j < n ; j++){
		if( a[i][j] == 'D' ){
			home = mp( i, j );
			a[i][j] = 'G';
		}
		if( a[i][j] == 'M' ){
			mecho = mp( i, j );
		}
	}

	if( !mecho_bfs( 0 ) ){
		printf("-1\n");
		return 0;
	}

/*
	int l = 0, r = n*n, res;
	while( l <= r ){
		int mid = (l+r)/2;

		if( mecho_bfs( s*(mid) ) ){
			res = mid;
			l = mid+1;
		} else {
			r = mid-1;
		}
	}
*/
	int res = 0;
	while( mecho_bfs( s*(res+1) ) ) res++;

	cout << res << endl;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:91:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &s);
  ~~~~~^~~~~~~~~~~~~~~~~
mecho.cpp:93:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", a[i]);
   ~~~~~^~~~~~~~~~~~

Subtask #1
57.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3456 KB Output is correct
2 Correct 5 ms 3456 KB Output is correct
3 Correct 5 ms 3456 KB Output is correct
4 Correct 4 ms 3456 KB Output is correct
5 Correct 4 ms 3584 KB Output is correct
6 Correct 6 ms 3456 KB Output is correct
7 Correct 282 ms 4252 KB Output is correct
8 Correct 5 ms 3456 KB Output is correct
9 Correct 5 ms 3584 KB Output is correct
10 Correct 5 ms 3456 KB Output is correct
11 Correct 5 ms 3584 KB Output is correct
12 Execution timed out 1066 ms 3456 KB Time limit exceeded
13 Incorrect 6 ms 3456 KB Output isn't correct
14 Correct 6 ms 3584 KB Output is correct
15 Correct 10 ms 3456 KB Output is correct
16 Correct 8 ms 3584 KB Output is correct
17 Correct 14 ms 3584 KB Output is correct
18 Correct 9 ms 3584 KB Output is correct
19 Correct 17 ms 3584 KB Output is correct
20 Correct 12 ms 3584 KB Output is correct
21 Correct 28 ms 3596 KB Output is correct
22 Correct 19 ms 3584 KB Output is correct
23 Correct 42 ms 3576 KB Output is correct
24 Correct 26 ms 3576 KB Output is correct
25 Correct 56 ms 3584 KB Output is correct
26 Correct 33 ms 3584 KB Output is correct
27 Correct 63 ms 3584 KB Output is correct
28 Correct 38 ms 3584 KB Output is correct
29 Correct 74 ms 3584 KB Output is correct
30 Correct 42 ms 3584 KB Output is correct
31 Correct 91 ms 3584 KB Output is correct
32 Correct 53 ms 3584 KB Output is correct
33 Execution timed out 1075 ms 3840 KB Time limit exceeded
34 Runtime error 484 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
35 Correct 19 ms 3960 KB Output is correct
36 Execution timed out 1076 ms 3840 KB Time limit exceeded
37 Runtime error 468 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
38 Correct 23 ms 3840 KB Output is correct
39 Execution timed out 1077 ms 3804 KB Time limit exceeded
40 Runtime error 494 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
41 Correct 22 ms 3840 KB Output is correct
42 Execution timed out 1079 ms 3840 KB Time limit exceeded
43 Runtime error 497 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
44 Correct 28 ms 3968 KB Output is correct
45 Execution timed out 1072 ms 3840 KB Time limit exceeded
46 Runtime error 440 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
47 Correct 46 ms 3968 KB Output is correct
48 Execution timed out 1081 ms 3968 KB Time limit exceeded
49 Runtime error 483 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
50 Correct 47 ms 3968 KB Output is correct
51 Execution timed out 1082 ms 3968 KB Time limit exceeded
52 Runtime error 487 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
53 Correct 59 ms 3968 KB Output is correct
54 Execution timed out 1061 ms 4088 KB Time limit exceeded
55 Runtime error 473 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
56 Correct 58 ms 3960 KB Output is correct
57 Execution timed out 1074 ms 4096 KB Time limit exceeded
58 Runtime error 508 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
59 Correct 76 ms 4096 KB Output is correct
60 Execution timed out 1072 ms 4096 KB Time limit exceeded
61 Runtime error 499 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
62 Correct 94 ms 4216 KB Output is correct
63 Correct 52 ms 4088 KB Output is correct
64 Runtime error 432 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
65 Execution timed out 1072 ms 4088 KB Time limit exceeded
66 Execution timed out 1070 ms 4088 KB Time limit exceeded
67 Correct 36 ms 4088 KB Output is correct
68 Correct 46 ms 4132 KB Output is correct
69 Correct 172 ms 4220 KB Output is correct
70 Correct 84 ms 4216 KB Output is correct
71 Correct 52 ms 4216 KB Output is correct
72 Execution timed out 1074 ms 4088 KB Time limit exceeded
73 Incorrect 594 ms 4204 KB Output isn't correct
74 Execution timed out 1078 ms 4204 KB Time limit exceeded
75 Correct 665 ms 4204 KB Output is correct
76 Correct 320 ms 4204 KB Output is correct
77 Execution timed out 1030 ms 4212 KB Time limit exceeded
78 Correct 46 ms 4216 KB Output is correct
79 Correct 941 ms 4344 KB Output is correct
80 Correct 484 ms 4344 KB Output is correct
81 Correct 384 ms 4220 KB Output is correct
82 Correct 842 ms 4332 KB Output is correct
83 Correct 33 ms 4224 KB Output is correct
84 Correct 904 ms 4224 KB Output is correct
85 Correct 304 ms 4344 KB Output is correct
86 Correct 234 ms 4216 KB Output is correct
87 Correct 625 ms 4220 KB Output is correct
88 Correct 43 ms 4224 KB Output is correct
89 Correct 514 ms 4284 KB Output is correct
90 Correct 214 ms 4248 KB Output is correct
91 Correct 333 ms 4224 KB Output is correct
92 Correct 142 ms 4344 KB Output is correct