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Submission #281943

# Submission time Handle Problem Language Result Execution time Memory
281943 2020-08-23T16:04:59 Z Plurm Mecho (IOI09_mecho) C++11
49 / 100
 390 ms 6344 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;
	while(!q.empty() && test[dx][dy] != 'M'){
		lm += s;
		propagateMecho(mq, lm);
		if(test[dx][dy] == 'M') return true;
		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 '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
49.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 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 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 343 ms 5976 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 2 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 26 ms 2560 KB Output isn't correct
34 Correct 28 ms 2560 KB Output is correct
35 Correct 54 ms 2560 KB Output is correct
36 Incorrect 33 ms 2944 KB Output isn't correct
37 Correct 34 ms 2944 KB Output is correct
38 Correct 72 ms 3064 KB Output is correct
39 Incorrect 48 ms 3284 KB Output isn't correct
40 Correct 42 ms 3200 KB Output is correct
41 Correct 78 ms 3200 KB Output is correct
42 Incorrect 54 ms 3584 KB Output isn't correct
43 Correct 53 ms 3584 KB Output is correct
44 Correct 103 ms 3584 KB Output is correct
45 Incorrect 68 ms 3968 KB Output isn't correct
46 Correct 66 ms 3968 KB Output is correct
47 Correct 125 ms 3992 KB Output is correct
48 Incorrect 80 ms 4224 KB Output isn't correct
49 Correct 84 ms 4224 KB Output is correct
50 Correct 146 ms 4472 KB Output is correct
51 Incorrect 95 ms 4608 KB Output isn't correct
52 Correct 95 ms 4608 KB Output is correct
53 Correct 180 ms 4708 KB Output is correct
54 Incorrect 109 ms 4992 KB Output isn't correct
55 Correct 120 ms 5112 KB Output is correct
56 Correct 214 ms 5072 KB Output is correct
57 Incorrect 121 ms 5376 KB Output isn't correct
58 Correct 145 ms 5376 KB Output is correct
59 Correct 237 ms 5448 KB Output is correct
60 Incorrect 146 ms 5884 KB Output isn't correct
61 Correct 140 ms 5880 KB Output is correct
62 Correct 311 ms 5760 KB Output is correct
63 Correct 312 ms 5880 KB Output is correct
64 Correct 330 ms 5880 KB Output is correct
65 Correct 300 ms 5880 KB Output is correct
66 Correct 321 ms 5820 KB Output is correct
67 Correct 302 ms 5760 KB Output is correct
68 Correct 338 ms 5760 KB Output is correct
69 Correct 328 ms 5880 KB Output is correct
70 Correct 305 ms 5864 KB Output is correct
71 Correct 351 ms 5888 KB Output is correct
72 Incorrect 338 ms 5884 KB Output isn't correct
73 Incorrect 390 ms 6232 KB Output isn't correct
74 Correct 365 ms 6236 KB Output is correct
75 Correct 385 ms 6228 KB Output is correct
76 Correct 388 ms 6264 KB Output is correct
77 Correct 365 ms 6344 KB Output is correct
78 Correct 359 ms 6312 KB Output is correct
79 Correct 344 ms 6192 KB Output is correct
80 Correct 355 ms 6192 KB Output is correct
81 Correct 361 ms 6292 KB Output is correct
82 Correct 357 ms 6284 KB Output is correct
83 Correct 356 ms 6164 KB Output is correct
84 Correct 344 ms 6168 KB Output is correct
85 Correct 367 ms 6136 KB Output is correct
86 Correct 368 ms 6208 KB Output is correct
87 Correct 341 ms 6128 KB Output is correct
88 Correct 354 ms 6056 KB Output is correct
89 Correct 365 ms 6208 KB Output is correct
90 Correct 355 ms 6052 KB Output is correct
91 Correct 337 ms 6056 KB Output is correct
92 Correct 381 ms 6152 KB Output is correct