oj.uz

Submission #117106

# Submission time Handle Problem Language Result Execution time Memory
117106 2019-06-14T21:12:08 Z eriksuenderhauf Mecho (IOI09_mecho) C++11
100 / 100
 333 ms 7160 KB 
//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define mem(a,v) memset((a), (v), sizeof (a))
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%I64d", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%I64d\n", (n))
#define pii pair<int, int>
#define pil pair<int, long long>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vil vector<pil>
#define vll vector<pll>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> oset;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 810;
const double eps = 1e-9;
int a[MAXN][MAXN], vis[MAXN][MAXN];
int n, s, dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
char str[MAXN][MAXN];
pii st = mp(0, 0), en = mp(0, 0);

bool in(int x, int y) {
	if (x < 1 || x > n || y < 1 || y > n)
		return 0;
	return 1;
}

bool ok(int t) {
	mem(vis, 0x3f);
	deque<pii> pq;
	pq.pb(st);
	vis[st.fi][st.se] = 0;
	while (!pq.empty()) {
		pii cur = pq.front(); pq.pop_front();
		if (cur == en)
			return 1;
		for (int i = 0; i < 4; i++) {
			int nx = cur.fi + dx[i];
			int ny = cur.se + dy[i];
			if (!in(nx, ny) || vis[cur.fi][cur.se] / s + t >= a[cur.fi][cur.se])
				continue;
			if (vis[nx][ny] > vis[cur.fi][cur.se] + 1) {
				vis[nx][ny] = vis[cur.fi][cur.se] + 1;
				pq.pb(mp(nx, ny));
			}
		}
	}
	return 0;
}

int main() {
	mem(a, -1);
	scanf("%d %d", &n, &s);
	deque<pii> pq;
	for (int i = 1; i <= n; i++) {
		scanf("%s", str[i] + 1);
		for (int j = 1; j <= n; j++) {
			if (str[i][j] == 'G' || str[i][j] == 'M' || str[i][j] == 'D')
				a[i][j] = INF;
			if (str[i][j] == 'M')
				st = mp(i, j);
			if (str[i][j] == 'D')
				en = mp(i, j);
			if (str[i][j] == 'H') {
				pq.pb(mp(i, j));
				a[i][j] = 0;
			}
		}
	}
	while (!pq.empty()) {
		pii cur = pq.front(); pq.pop_front();
		for (int i = 0; i < 4; i++) {
			int nx = cur.fi + dx[i];
			int ny = cur.se + dy[i];
			if (!in(nx, ny) || str[nx][ny] == 'D')
				continue;
			if (a[nx][ny] > a[cur.fi][cur.se] + 1) {
				a[nx][ny] = a[cur.fi][cur.se] + 1;
				pq.pb(mp(nx, ny));
			}
		}
	}
	int lo = 0, hi = n * n;
	while (lo <= hi) {
		int mi = (lo+hi) / 2;
		if (ok(mi))
			lo = mi + 1;
		else
			hi = mi - 1;
	}
	pri(lo - 1);
	return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:73:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &s);
  ~~~~~^~~~~~~~~~~~~~~~~
mecho.cpp:76:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", str[i] + 1);
   ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5504 KB Output is correct
2 Correct 7 ms 5504 KB Output is correct
3 Correct 7 ms 5504 KB Output is correct
4 Correct 6 ms 5504 KB Output is correct
5 Correct 7 ms 5504 KB Output is correct
6 Correct 7 ms 5504 KB Output is correct
7 Correct 122 ms 7004 KB Output is correct
8 Correct 10 ms 5504 KB Output is correct
9 Correct 7 ms 5504 KB Output is correct
10 Correct 7 ms 5504 KB Output is correct
11 Correct 7 ms 5760 KB Output is correct
12 Correct 8 ms 5504 KB Output is correct
13 Correct 8 ms 5504 KB Output is correct
14 Correct 8 ms 5504 KB Output is correct
15 Correct 7 ms 5504 KB Output is correct
16 Correct 7 ms 5476 KB Output is correct
17 Correct 7 ms 5504 KB Output is correct
18 Correct 8 ms 5504 KB Output is correct
19 Correct 7 ms 5504 KB Output is correct
20 Correct 7 ms 5504 KB Output is correct
21 Correct 7 ms 5504 KB Output is correct
22 Correct 7 ms 5492 KB Output is correct
23 Correct 7 ms 5504 KB Output is correct
24 Correct 7 ms 5504 KB Output is correct
25 Correct 7 ms 5504 KB Output is correct
26 Correct 7 ms 5504 KB Output is correct
27 Correct 8 ms 5596 KB Output is correct
28 Correct 7 ms 5504 KB Output is correct
29 Correct 7 ms 5504 KB Output is correct
30 Correct 8 ms 5504 KB Output is correct
31 Correct 9 ms 5504 KB Output is correct
32 Correct 8 ms 5504 KB Output is correct
33 Correct 11 ms 6016 KB Output is correct
34 Correct 12 ms 5888 KB Output is correct
35 Correct 40 ms 5888 KB Output is correct
36 Correct 12 ms 6016 KB Output is correct
37 Correct 11 ms 6016 KB Output is correct
38 Correct 44 ms 6012 KB Output is correct
39 Correct 12 ms 6016 KB Output is correct
40 Correct 13 ms 6016 KB Output is correct
41 Correct 65 ms 6016 KB Output is correct
42 Correct 12 ms 6136 KB Output is correct
43 Correct 14 ms 6144 KB Output is correct
44 Correct 87 ms 6144 KB Output is correct
45 Correct 14 ms 6144 KB Output is correct
46 Correct 14 ms 6144 KB Output is correct
47 Correct 87 ms 6272 KB Output is correct
48 Correct 14 ms 6392 KB Output is correct
49 Correct 15 ms 6272 KB Output is correct
50 Correct 116 ms 6272 KB Output is correct
51 Correct 16 ms 6400 KB Output is correct
52 Correct 19 ms 6400 KB Output is correct
53 Correct 134 ms 6516 KB Output is correct
54 Correct 17 ms 6528 KB Output is correct
55 Correct 19 ms 6528 KB Output is correct
56 Correct 159 ms 6620 KB Output is correct
57 Correct 21 ms 6656 KB Output is correct
58 Correct 20 ms 6652 KB Output is correct
59 Correct 192 ms 6776 KB Output is correct
60 Correct 22 ms 6784 KB Output is correct
61 Correct 20 ms 6784 KB Output is correct
62 Correct 219 ms 6748 KB Output is correct
63 Correct 168 ms 6784 KB Output is correct
64 Correct 333 ms 6904 KB Output is correct
65 Correct 240 ms 6776 KB Output is correct
66 Correct 191 ms 6904 KB Output is correct
67 Correct 180 ms 6776 KB Output is correct
68 Correct 60 ms 6776 KB Output is correct
69 Correct 60 ms 6776 KB Output is correct
70 Correct 44 ms 6776 KB Output is correct
71 Correct 54 ms 6784 KB Output is correct
72 Correct 31 ms 6776 KB Output is correct
73 Correct 36 ms 7160 KB Output is correct
74 Correct 69 ms 7032 KB Output is correct
75 Correct 85 ms 7032 KB Output is correct
76 Correct 80 ms 7032 KB Output is correct
77 Correct 77 ms 7040 KB Output is correct
78 Correct 101 ms 7160 KB Output is correct
79 Correct 59 ms 7032 KB Output is correct
80 Correct 74 ms 7032 KB Output is correct
81 Correct 87 ms 7024 KB Output is correct
82 Correct 72 ms 7008 KB Output is correct
83 Correct 95 ms 6904 KB Output is correct
84 Correct 86 ms 6904 KB Output is correct
85 Correct 114 ms 6904 KB Output is correct
86 Correct 110 ms 6988 KB Output is correct
87 Correct 114 ms 6988 KB Output is correct
88 Correct 100 ms 6984 KB Output is correct
89 Correct 106 ms 7032 KB Output is correct
90 Correct 121 ms 6936 KB Output is correct
91 Correct 121 ms 6904 KB Output is correct
92 Correct 124 ms 6948 KB Output is correct