oj.uz

Submission #281908

# Submission time Handle Problem Language Result Execution time Memory
281908 2020-08-23T15:36:34 Z Plurm Mecho (IOI09_mecho) C++11
30 / 100
 445 ms 6400 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){
	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 = 0;
	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:92:6: warning: unused variable 'oldDays' [-Wunused-variable]
   92 |  int oldDays = days;
      |      ^~~~~~~
mecho.cpp: In function 'int main()':
mecho.cpp:102:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  102 |  scanf("%d%d",&n,&s);
      |  ~~~~~^~~~~~~~~~~~~~
mecho.cpp:104:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  104 |   scanf("%s", t[i]+1);
      |   ~~~~~^~~~~~~~~~~~~~
mecho.cpp: In function 'bool escapePossible(int)':
mecho.cpp:73:10: warning: 'dy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   73 |  int dx, dy;
      |          ^~
mecho.cpp:73:6: warning: 'dx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   73 |  int dx, dy;
      |      ^~

Subtask #1
30.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Incorrect 0 ms 384 KB Output isn't correct
3 Incorrect 0 ms 384 KB Output isn't correct
4 Incorrect 1 ms 384 KB Output isn't correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Incorrect 325 ms 6080 KB Output isn't correct
8 Incorrect 1 ms 384 KB Output isn't correct
9 Correct 1 ms 384 KB Output is correct
10 Incorrect 1 ms 384 KB Output isn't correct
11 Incorrect 1 ms 384 KB Output isn't correct
12 Correct 1 ms 640 KB Output is correct
13 Incorrect 1 ms 640 KB Output isn't correct
14 Incorrect 2 ms 640 KB Output isn't 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 2 ms 768 KB Output isn't correct
30 Correct 2 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 2560 KB Output isn't correct
34 Correct 23 ms 2560 KB Output is correct
35 Correct 36 ms 2560 KB Output is correct
36 Incorrect 31 ms 2944 KB Output isn't correct
37 Correct 34 ms 2936 KB Output is correct
38 Correct 47 ms 2944 KB Output is correct
39 Incorrect 42 ms 3200 KB Output isn't correct
40 Correct 42 ms 3200 KB Output is correct
41 Correct 65 ms 3320 KB Output is correct
42 Incorrect 53 ms 3704 KB Output isn't correct
43 Correct 58 ms 3704 KB Output is correct
44 Correct 82 ms 3636 KB Output is correct
45 Incorrect 66 ms 3968 KB Output isn't correct
46 Correct 70 ms 3968 KB Output is correct
47 Correct 99 ms 4088 KB Output is correct
48 Incorrect 87 ms 4472 KB Output isn't correct
49 Correct 81 ms 4352 KB Output is correct
50 Correct 125 ms 4472 KB Output is correct
51 Incorrect 95 ms 4728 KB Output isn't correct
52 Correct 94 ms 4608 KB Output is correct
53 Correct 143 ms 4728 KB Output is correct
54 Incorrect 107 ms 4992 KB Output isn't correct
55 Correct 119 ms 5112 KB Output is correct
56 Correct 173 ms 5112 KB Output is correct
57 Incorrect 122 ms 5376 KB Output isn't correct
58 Correct 127 ms 5376 KB Output is correct
59 Correct 191 ms 5376 KB Output is correct
60 Incorrect 145 ms 5760 KB Output isn't correct
61 Correct 147 ms 5836 KB Output is correct
62 Correct 247 ms 5848 KB Output is correct
63 Correct 233 ms 5880 KB Output is correct
64 Correct 275 ms 5836 KB Output is correct
65 Correct 241 ms 5836 KB Output is correct
66 Incorrect 266 ms 5760 KB Output isn't correct
67 Incorrect 249 ms 5832 KB Output isn't correct
68 Correct 270 ms 5888 KB Output is correct
69 Correct 253 ms 5760 KB Output is correct
70 Correct 277 ms 5888 KB Output is correct
71 Correct 263 ms 5888 KB Output is correct
72 Incorrect 310 ms 5880 KB Output isn't correct
73 Incorrect 377 ms 6308 KB Output isn't correct
74 Correct 358 ms 6252 KB Output is correct
75 Correct 428 ms 6400 KB Output is correct
76 Correct 413 ms 6352 KB Output is correct
77 Correct 445 ms 6340 KB Output is correct
78 Incorrect 339 ms 6204 KB Output isn't correct
79 Correct 328 ms 6328 KB Output is correct
80 Correct 345 ms 6204 KB Output is correct
81 Correct 358 ms 6200 KB Output is correct
82 Correct 352 ms 6328 KB Output is correct
83 Correct 329 ms 6144 KB Output is correct
84 Correct 343 ms 6216 KB Output is correct
85 Correct 355 ms 6304 KB Output is correct
86 Correct 346 ms 6144 KB Output is correct
87 Correct 339 ms 6224 KB Output is correct
88 Correct 327 ms 6140 KB Output is correct
89 Correct 337 ms 6104 KB Output is correct
90 Correct 331 ms 6192 KB Output is correct
91 Correct 317 ms 6072 KB Output is correct
92 Correct 329 ms 6072 KB Output is correct