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Submission #281913

# Submission time Handle Problem Language Result Execution time Memory
281913 2020-08-23T15:39:32 Z Plurm Mecho (IOI09_mecho) C++11
45 / 100
 371 ms 5760 KB 
#include <bits/stdc++.h>
using namespace std;
char t[1024][1024];
char test[1024][1024];
int dist[1024][1024];
int n, s;
class state{
public:
	int x,y,cw;
	state(int a, int b, int c): x(a), y(b), cw(c) {}
};
void propagateBees(queue<state>& q, int limit){
	while(!q.empty() && q.front().cw < limit){
		state cur = q.front();
		q.pop();
		int x = cur.x;
		int y = cur.y;
		int w = cur.cw+1;
		if(x > 1 && (test[x-1][y] == 'G' || test[x-1][y] == 'M') && dist[x-1][y] > w){
			dist[x-1][y] = w;
			test[x-1][y] = 'H';
			q.emplace(x-1, y, w);
		}
		if(x < n && (test[x+1][y] == 'G' || test[x+1][y] == 'M') && dist[x+1][y] > w){
			dist[x+1][y] = w;
			test[x+1][y] = 'H';
			q.emplace(x+1, y, w);
		}
		if(y > 1 && (test[x][y-1] == 'G' || test[x][y-1] == 'M') && dist[x][y-1] > w){
			dist[x][y-1] = w;
			test[x][y-1] = 'H';
			q.emplace(x, y-1, w);
		}
		if(y < n && (test[x][y+1] == 'G' || test[x][y+1] == 'M') && dist[x][y+1] > w){
			dist[x][y+1] = w;
			test[x][y+1] = 'H';
			q.emplace(x, y+1, w);
		}
	}
}
void propagateMecho(queue<state>& q, int limit){
	while(!q.empty() && q.front().cw < limit){
		state cur = q.front();
		q.pop();
		int x = cur.x;
		int y = cur.y;
		if(test[x][y] != 'M') continue;
		int w = cur.cw+1;
		if(x > 1 && (test[x-1][y] == 'G' || test[x-1][y] == 'D') && dist[x-1][y] > w){
			dist[x-1][y] = w;
			test[x-1][y] = 'M';
			q.emplace(x-1, y, w);
		}
		if(x < n && (test[x+1][y] == 'G' || test[x+1][y] == 'D') && dist[x+1][y] > w){
			dist[x+1][y] = w;
			test[x+1][y] = 'M';
			q.emplace(x+1, y, w);
		}
		if(y > 1 && (test[x][y-1] == 'G' || test[x][y-1] == 'D') && dist[x][y-1] > w){
			dist[x][y-1] = w;
			test[x][y-1] = 'M';
			q.emplace(x, y-1, w);
		}
		if(y < n && (test[x][y+1] == 'G' || test[x][y+1] == 'D') && dist[x][y+1] > w){
			dist[x][y+1] = w;
			test[x][y+1] = 'M';
			q.emplace(x, y+1, w);
		}
	}
}
bool escapePossible(int days){
	if(days == -1) return true;
	queue<state> q, mq;
	int dx, dy;
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= n; j++){
			test[i][j] = t[i][j];
			dist[i][j] = 1e9;
			if(t[i][j] == 'H'){
				q.emplace(i,j,0);
				dist[i][j] = 0;
			}else if(t[i][j] == 'D'){
				dx = i;
				dy = j;
			}else if(t[i][j] == 'M'){
				mq.emplace(i,j,0);
				dist[i][j] = 0;
			}
		}
	}
	propagateBees(q, days);
	int lm = 0;
	int oldDays = days;
	while(!mq.empty() && !q.empty() && test[dx][dy] != 'M'){
		lm += s;
		propagateMecho(mq, lm);
		days++;
		propagateBees(q, days);
	}
	return test[dx][dy] == 'M';
}
int main(){
	scanf("%d%d",&n,&s);
	for(int i = 1; i <= n; i++){
		scanf("%s", t[i]+1);
	}
	int lo = -1;
	int hi = n*n;
	int mid;
	while(lo < hi){
		mid = (lo+hi+1)/2;
		if(escapePossible(mid)){
			lo = mid;
		}else{
			hi = mid-1;
		}
	}
	printf("%d\n", lo);
	return 0;
}

Compilation message

mecho.cpp: In function 'bool escapePossible(int)':
mecho.cpp:93:6: warning: unused variable 'oldDays' [-Wunused-variable]
   93 |  int oldDays = days;
      |      ^~~~~~~
mecho.cpp: In function 'int main()':
mecho.cpp:103:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  103 |  scanf("%d%d",&n,&s);
      |  ~~~~~^~~~~~~~~~~~~~
mecho.cpp:105:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  105 |   scanf("%s", t[i]+1);
      |   ~~~~~^~~~~~~~~~~~~~
mecho.cpp: In function 'bool escapePossible(int)':
mecho.cpp:74:10: warning: 'dy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   74 |  int dx, dy;
      |          ^~
mecho.cpp:74:6: warning: 'dx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   74 |  int dx, dy;
      |      ^~

Subtask #1
45.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Correct 0 ms 384 KB Output is correct
3 Incorrect 1 ms 384 KB Output isn't correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Incorrect 0 ms 384 KB Output isn't correct
7 Correct 313 ms 5472 KB Output is correct
8 Incorrect 1 ms 384 KB Output isn't correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 640 KB Output is correct
13 Incorrect 1 ms 640 KB Output isn't correct
14 Correct 2 ms 640 KB Output is correct
15 Incorrect 1 ms 384 KB Output isn't correct
16 Correct 1 ms 384 KB Output is correct
17 Incorrect 1 ms 512 KB Output isn't correct
18 Correct 1 ms 512 KB Output is correct
19 Incorrect 1 ms 512 KB Output isn't correct
20 Correct 1 ms 512 KB Output is correct
21 Incorrect 1 ms 512 KB Output isn't correct
22 Correct 1 ms 512 KB Output is correct
23 Incorrect 1 ms 640 KB Output isn't correct
24 Correct 1 ms 640 KB Output is correct
25 Incorrect 1 ms 640 KB Output isn't correct
26 Correct 1 ms 640 KB Output is correct
27 Incorrect 1 ms 768 KB Output isn't correct
28 Correct 1 ms 768 KB Output is correct
29 Incorrect 1 ms 768 KB Output isn't correct
30 Correct 1 ms 768 KB Output is correct
31 Incorrect 1 ms 768 KB Output isn't correct
32 Correct 2 ms 768 KB Output is correct
33 Incorrect 23 ms 2432 KB Output isn't correct
34 Correct 25 ms 2432 KB Output is correct
35 Correct 39 ms 2432 KB Output is correct
36 Incorrect 34 ms 2688 KB Output isn't correct
37 Correct 35 ms 2688 KB Output is correct
38 Correct 48 ms 2688 KB Output is correct
39 Incorrect 43 ms 3072 KB Output isn't correct
40 Correct 44 ms 3072 KB Output is correct
41 Correct 82 ms 3072 KB Output is correct
42 Incorrect 53 ms 3328 KB Output isn't correct
43 Correct 55 ms 3328 KB Output is correct
44 Correct 84 ms 3448 KB Output is correct
45 Incorrect 68 ms 3584 KB Output isn't correct
46 Correct 62 ms 3584 KB Output is correct
47 Correct 93 ms 3584 KB Output is correct
48 Incorrect 80 ms 3968 KB Output isn't correct
49 Correct 81 ms 4088 KB Output is correct
50 Correct 121 ms 4088 KB Output is correct
51 Incorrect 90 ms 4224 KB Output isn't correct
52 Correct 91 ms 4224 KB Output is correct
53 Correct 141 ms 4224 KB Output is correct
54 Incorrect 106 ms 4580 KB Output isn't correct
55 Correct 106 ms 4480 KB Output is correct
56 Correct 162 ms 4480 KB Output is correct
57 Incorrect 120 ms 4864 KB Output isn't correct
58 Correct 122 ms 4864 KB Output is correct
59 Correct 189 ms 4864 KB Output is correct
60 Incorrect 143 ms 5240 KB Output isn't correct
61 Correct 140 ms 5120 KB Output is correct
62 Correct 213 ms 5204 KB Output is correct
63 Correct 250 ms 5240 KB Output is correct
64 Correct 266 ms 5120 KB Output is correct
65 Correct 239 ms 5120 KB Output is correct
66 Correct 267 ms 5240 KB Output is correct
67 Correct 252 ms 5120 KB Output is correct
68 Correct 300 ms 5120 KB Output is correct
69 Correct 286 ms 5364 KB Output is correct
70 Correct 266 ms 5120 KB Output is correct
71 Correct 284 ms 5240 KB Output is correct
72 Incorrect 331 ms 5264 KB Output isn't correct
73 Incorrect 371 ms 5708 KB Output isn't correct
74 Correct 341 ms 5736 KB Output is correct
75 Correct 361 ms 5760 KB Output is correct
76 Correct 338 ms 5604 KB Output is correct
77 Correct 358 ms 5720 KB Output is correct
78 Correct 329 ms 5568 KB Output is correct
79 Correct 340 ms 5636 KB Output is correct
80 Correct 324 ms 5568 KB Output is correct
81 Correct 329 ms 5736 KB Output is correct
82 Correct 337 ms 5560 KB Output is correct
83 Correct 319 ms 5572 KB Output is correct
84 Correct 323 ms 5672 KB Output is correct
85 Correct 342 ms 5504 KB Output is correct
86 Correct 329 ms 5504 KB Output is correct
87 Correct 329 ms 5632 KB Output is correct
88 Correct 324 ms 5668 KB Output is correct
89 Correct 317 ms 5456 KB Output is correct
90 Correct 317 ms 5560 KB Output is correct
91 Correct 327 ms 5512 KB Output is correct
92 Correct 341 ms 5440 KB Output is correct