Submission #53461

# Submission time Handle Problem Language Result Execution time Memory
53461 2018-06-30T05:26:31 Z 강태규(#1417) Mecho (IOI09_mecho) C++11
84 / 100
226 ms 8928 KB
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <unordered_map>
#include <functional>
#include <cstring>
#include <cmath>
#include <ctime>
#include <cstdlib>

using namespace std;
typedef long long llong;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<llong, llong> pll;

const int inf = 1e8;
int n, sd, sx, sy;
char grid[800][801];
int dist[800][800];
int bdst[800][800];
int que[800 * 800];
const int gox[4] = { 1, 0, -1, 0 };
const int goy[4] = { 0, 1, 0, -1 };

int check(int t) {
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            bdst[i][j] = inf;
        }
    }
    int tp = 0, bt = 0;
    bdst[sx][sy] = sd * t;
    que[tp++] = sx * n + sy;
    while (bt < tp) {
        int xy = que[bt++];
        int x = xy / n;
        int y = xy % n;
        if (dist[x][y] * sd <= bdst[x][y]) continue;
        if (grid[x][y] == 'D') return 1;
        for (int i = 0; i < 4; ++i) {
            int nx = x + gox[i];
            int ny = y + goy[i];
            if (nx < 0 || n <= nx || ny < 0 || n <= ny) continue;
            if (grid[nx][ny] == 'T') continue;
            if (bdst[nx][ny] < inf) continue;
            bdst[nx][ny] = bdst[x][y] + 1;
            que[tp++] = nx * n + ny;
        }
    }
    return 0;
}

int main() {
    scanf("%d%d", &n, &sd);
    int tp = 0, bt = 0;
    for (int i = 0; i < n; ++i) {
        scanf("%s", grid[i]);
        for (int j = 0; j < n; ++j) {
            dist[i][j] = inf;
            if (grid[i][j] == 'M') sx = i, sy = j;
            else if (grid[i][j] == 'H') dist[i][j] = 0, que[tp++] = i * n + j;
        }
    }
    
    while (bt < tp) {
        int xy = que[bt++];
        int x = xy / n;
        int y = xy % n;
        if (grid[x][y] == 'D') continue;
        for (int i = 0; i < 4; ++i) {
            int nx = x + gox[i];
            int ny = y + goy[i];
            if (nx < 0 || n <= nx || ny < 0 || n <= ny) continue;
            if (grid[nx][ny] == 'T') continue;
            if (dist[nx][ny] < inf) continue;
            dist[nx][ny] = dist[x][y] + 1;
            que[tp++] = nx * n + ny;
        }
    }
    
    int s = -1, e = dist[sx][sy];
    while (s < e) {
        int m = (s + e + 1) / 2;
        if (check(m)) s = m;
        else e = m - 1;
    }
    printf("%d\n", s);
	return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:59:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &sd);
     ~~~~~^~~~~~~~~~~~~~~~~
mecho.cpp:62:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s", grid[i]);
         ~~~~~^~~~~~~~~~~~~~~
# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Incorrect 2 ms 548 KB Output isn't correct
3 Correct 2 ms 548 KB Output is correct
4 Incorrect 2 ms 548 KB Output isn't correct
5 Correct 2 ms 548 KB Output is correct
6 Incorrect 2 ms 548 KB Output isn't correct
7 Incorrect 102 ms 8576 KB Output isn't correct
8 Correct 2 ms 8576 KB Output is correct
9 Correct 2 ms 8576 KB Output is correct
10 Correct 2 ms 8576 KB Output is correct
11 Correct 2 ms 8576 KB Output is correct
12 Incorrect 2 ms 8576 KB Output isn't correct
13 Correct 2 ms 8576 KB Output is correct
14 Correct 3 ms 8576 KB Output is correct
15 Correct 2 ms 8576 KB Output is correct
16 Correct 2 ms 8576 KB Output is correct
17 Correct 2 ms 8576 KB Output is correct
18 Correct 2 ms 8576 KB Output is correct
19 Correct 2 ms 8576 KB Output is correct
20 Correct 2 ms 8576 KB Output is correct
21 Correct 2 ms 8576 KB Output is correct
22 Correct 2 ms 8576 KB Output is correct
23 Correct 3 ms 8576 KB Output is correct
24 Correct 2 ms 8576 KB Output is correct
25 Correct 2 ms 8576 KB Output is correct
26 Correct 3 ms 8576 KB Output is correct
27 Correct 2 ms 8576 KB Output is correct
28 Correct 3 ms 8576 KB Output is correct
29 Correct 2 ms 8576 KB Output is correct
30 Correct 2 ms 8576 KB Output is correct
31 Correct 2 ms 8576 KB Output is correct
32 Correct 2 ms 8576 KB Output is correct
33 Correct 7 ms 8576 KB Output is correct
34 Correct 10 ms 8576 KB Output is correct
35 Correct 25 ms 8576 KB Output is correct
36 Correct 8 ms 8576 KB Output is correct
37 Correct 9 ms 8576 KB Output is correct
38 Correct 33 ms 8576 KB Output is correct
39 Correct 10 ms 8576 KB Output is correct
40 Correct 13 ms 8576 KB Output is correct
41 Correct 44 ms 8576 KB Output is correct
42 Correct 11 ms 8576 KB Output is correct
43 Correct 12 ms 8576 KB Output is correct
44 Correct 68 ms 8576 KB Output is correct
45 Correct 14 ms 8576 KB Output is correct
46 Correct 14 ms 8576 KB Output is correct
47 Correct 67 ms 8576 KB Output is correct
48 Correct 14 ms 8576 KB Output is correct
49 Correct 14 ms 8576 KB Output is correct
50 Correct 81 ms 8576 KB Output is correct
51 Correct 17 ms 8576 KB Output is correct
52 Correct 17 ms 8576 KB Output is correct
53 Correct 122 ms 8576 KB Output is correct
54 Correct 19 ms 8576 KB Output is correct
55 Correct 23 ms 8576 KB Output is correct
56 Correct 128 ms 8576 KB Output is correct
57 Correct 26 ms 8576 KB Output is correct
58 Correct 21 ms 8576 KB Output is correct
59 Correct 133 ms 8576 KB Output is correct
60 Correct 24 ms 8576 KB Output is correct
61 Correct 23 ms 8576 KB Output is correct
62 Correct 168 ms 8576 KB Output is correct
63 Correct 148 ms 8576 KB Output is correct
64 Correct 226 ms 8576 KB Output is correct
65 Correct 217 ms 8576 KB Output is correct
66 Correct 160 ms 8576 KB Output is correct
67 Correct 144 ms 8576 KB Output is correct
68 Correct 60 ms 8576 KB Output is correct
69 Correct 60 ms 8576 KB Output is correct
70 Correct 54 ms 8576 KB Output is correct
71 Correct 51 ms 8576 KB Output is correct
72 Correct 45 ms 8576 KB Output is correct
73 Correct 58 ms 8704 KB Output is correct
74 Correct 78 ms 8736 KB Output is correct
75 Correct 76 ms 8736 KB Output is correct
76 Correct 82 ms 8828 KB Output is correct
77 Correct 81 ms 8828 KB Output is correct
78 Correct 95 ms 8828 KB Output is correct
79 Correct 85 ms 8828 KB Output is correct
80 Correct 100 ms 8828 KB Output is correct
81 Correct 88 ms 8828 KB Output is correct
82 Correct 75 ms 8828 KB Output is correct
83 Correct 159 ms 8828 KB Output is correct
84 Correct 92 ms 8828 KB Output is correct
85 Correct 99 ms 8828 KB Output is correct
86 Correct 110 ms 8828 KB Output is correct
87 Correct 98 ms 8928 KB Output is correct
88 Correct 106 ms 8928 KB Output is correct
89 Correct 132 ms 8928 KB Output is correct
90 Correct 114 ms 8928 KB Output is correct
91 Correct 132 ms 8928 KB Output is correct
92 Correct 112 ms 8928 KB Output is correct