답안 #92080

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
92080 2019-01-01T11:54:12 Z arman_ferdous Mecho (IOI09_mecho) C++17
45 / 100
544 ms 66560 KB
#include <bits/stdc++.h>
using namespace std;
 
typedef pair<int,int> ii;
const int N = 1001;
const int inf = 2e9;
 
int n, S, d[N][N], dist[N][N];
char s[N][N];
queue<ii> q;
ii mecho, home;
 
int dx[] = {1,0,-1,0};
int dy[] = {0,1,0,-1};
 
bool can(int T) {
	for(int i = 0; i < n; i++)
		for(int j = 0; j < n; j++)
			dist[i][j] = inf;
	if(T * S >= d[mecho.first][mecho.second]) return false;
 
	q.push(mecho);
	dist[mecho.first][mecho.second] = T * S;
	ii u; int arrival, tx, ty;
	while(!q.empty()) {
		u = q.front(); q.pop();
		for(int i = 0; i < 4; i++) {
			tx = u.first + dx[i], ty = u.second + dy[i];
			if(min(tx,ty) < 0 || max(tx,ty) >= n) continue;
			if(s[tx][ty] != 'G' && s[tx][ty] != 'D') continue;
			arrival = dist[u.first][u.second] + 1;
			if(arrival >= d[tx][ty] || arrival > dist[tx][ty]) continue;
			dist[tx][ty] = dist[u.first][u.second] + 1;
			q.push({tx,ty});
		}
	} 
	return dist[home.first][home.second] != inf;
}
 
int main() {
	scanf("%d %d", &n, &S);
	for(int i = 0; i < n; i++)
		scanf(" %s", s[i]);
 
	for(int i = 0; i < n; i++)
		for(int j = 0; j < n; j++) {
			d[i][j] = inf;
			if(s[i][j] == 'M') mecho = {i,j};
			else if(s[i][j] == 'D') home = {i,j};
		}
	s[mecho.first][mecho.second] = 'G';
 
	for(int i = 0; i < n; i++)
		for(int j = 0; j < n; j++) 
			if(s[i][j] == 'H') {
				q.push({i,j});
				d[i][j] = 0;
			}
 
	while(!q.empty()) {
		ii u = q.front(); q.pop();
		for(int i = 0; i < 4; i++) {
			int tx = u.first + dx[i], ty = u.second + dy[i];
			if(min(tx,ty) < 0 || max(tx,ty) >= n) continue;
			if(s[tx][ty] != 'G') continue;
			if(d[tx][ty] < d[u.first][u.second] + S) continue;
			d[tx][ty] = d[u.first][u.second] + S;
			q.push({tx,ty});
		}
	}
	int lo = 0, hi = n * n, ans = -1;
	while(lo <= hi) {
		int mid = (lo + hi) >> 1;
		if(can(mid)) ans = mid, lo = mid+1;
		else hi = mid-1;
	} printf("%d\n", ans);
	return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:41:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &S);
  ~~~~~^~~~~~~~~~~~~~~~~
mecho.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %s", s[i]);
   ~~~~~^~~~~~~~~~~~~
# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 292 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Runtime error 328 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
8 Correct 2 ms 504 KB Output is correct
9 Correct 2 ms 504 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 504 KB Output is correct
12 Correct 2 ms 888 KB Output is correct
13 Runtime error 435 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
14 Runtime error 448 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 480 KB Output is correct
17 Correct 2 ms 508 KB Output is correct
18 Correct 2 ms 504 KB Output is correct
19 Correct 2 ms 632 KB Output is correct
20 Correct 2 ms 632 KB Output is correct
21 Correct 2 ms 604 KB Output is correct
22 Correct 2 ms 632 KB Output is correct
23 Correct 2 ms 760 KB Output is correct
24 Correct 2 ms 764 KB Output is correct
25 Correct 3 ms 888 KB Output is correct
26 Correct 2 ms 888 KB Output is correct
27 Correct 2 ms 888 KB Output is correct
28 Correct 2 ms 888 KB Output is correct
29 Correct 2 ms 888 KB Output is correct
30 Correct 2 ms 1016 KB Output is correct
31 Correct 2 ms 1016 KB Output is correct
32 Correct 2 ms 1016 KB Output is correct
33 Correct 8 ms 3448 KB Output is correct
34 Correct 8 ms 3576 KB Output is correct
35 Runtime error 304 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
36 Correct 9 ms 3960 KB Output is correct
37 Correct 9 ms 3960 KB Output is correct
38 Runtime error 304 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
39 Correct 10 ms 4472 KB Output is correct
40 Correct 11 ms 4476 KB Output is correct
41 Runtime error 289 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
42 Correct 13 ms 4988 KB Output is correct
43 Correct 13 ms 4900 KB Output is correct
44 Runtime error 285 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
45 Correct 13 ms 5468 KB Output is correct
46 Correct 14 ms 5496 KB Output is correct
47 Runtime error 284 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
48 Correct 16 ms 5880 KB Output is correct
49 Correct 17 ms 5884 KB Output is correct
50 Runtime error 295 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
51 Correct 19 ms 6392 KB Output is correct
52 Correct 20 ms 6392 KB Output is correct
53 Runtime error 307 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
54 Correct 21 ms 7032 KB Output is correct
55 Correct 23 ms 7032 KB Output is correct
56 Runtime error 282 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
57 Correct 24 ms 7544 KB Output is correct
58 Correct 26 ms 7544 KB Output is correct
59 Runtime error 298 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
60 Correct 26 ms 7932 KB Output is correct
61 Correct 28 ms 8056 KB Output is correct
62 Runtime error 279 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
63 Correct 119 ms 7928 KB Output is correct
64 Correct 201 ms 8056 KB Output is correct
65 Correct 156 ms 8036 KB Output is correct
66 Correct 133 ms 8040 KB Output is correct
67 Correct 126 ms 8032 KB Output is correct
68 Correct 55 ms 8064 KB Output is correct
69 Correct 57 ms 7992 KB Output is correct
70 Correct 41 ms 8056 KB Output is correct
71 Correct 45 ms 8056 KB Output is correct
72 Correct 34 ms 8056 KB Output is correct
73 Runtime error 495 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
74 Runtime error 496 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
75 Runtime error 530 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
76 Runtime error 507 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
77 Runtime error 503 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
78 Runtime error 447 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
79 Runtime error 544 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
80 Runtime error 434 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
81 Runtime error 438 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
82 Runtime error 480 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
83 Runtime error 395 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
84 Runtime error 401 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
85 Runtime error 416 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
86 Runtime error 416 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
87 Runtime error 374 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
88 Runtime error 351 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
89 Runtime error 337 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
90 Runtime error 336 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
91 Runtime error 334 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)
92 Runtime error 369 ms 66560 KB Execution killed with signal 9 (could be triggered by violating memory limits)