oj.uz

Submission #100781

# Submission time Handle Problem Language Result Execution time Memory
100781 2019-03-14T10:14:52 Z Alexa2001 Mecho (IOI09_mecho) C++17
100 / 100
 239 ms 7032 KB 
#include <bits/stdc++.h>

using namespace std;

const int Nmax = 808, inf = Nmax * Nmax;
int n, S;
char a[Nmax][Nmax];

int dx[] = { 0, 0, 1, -1 };
int dy[] = { 1, -1, 0, 0 };

int tmp[Nmax][Nmax], D[Nmax][Nmax];
queue< pair<int,int> > q;


void prec()
{
    int i, j, x, y, X, Y;

    for(i=1; i<=n; ++i)
        for(j=1; j<=n; ++j)
            tmp[i][j] = inf;

    for(i=1; i<=n; ++i)
        for(j=1; j<=n; ++j)
            if(a[i][j] == 'H')
            {
                q.push({i, j});
                tmp[i][j] = 0;
            }

    while(q.size())
    {
        tie(x, y) = q.front();
        q.pop();

        for(i=0; i<4; ++i)
        {
            X = x + dx[i];
            Y = y + dy[i];

            if((a[X][Y] == 'G' || a[X][Y] == 'M') && tmp[X][Y] == inf)
            {
                tmp[X][Y] = tmp[x][y] + 1;
                q.push({X, Y});
            }
        }
    }
}

bool check(int T)
{
    while(q.size()) q.pop();

    int i, j, x, y, X, Y;
    for(i=1; i<=n; ++i)
        for(j=1; j<=n; ++j)
        {
            if(a[i][j] == 'M')
                x = i, y = j;
            D[i][j] = inf;
        }

    if(!(T < tmp[x][y])) return 0;

    q.push({x, y});
    D[x][y] = 0;

    while(q.size())
    {
        tie(X, Y) = q.front();
        q.pop();

        for(i=0; i<4; ++i)
        {
            x = X + dx[i];
            y = Y + dy[i];

            if(a[x][y] == 'D') return 1;

            if(a[x][y] == 'G' && D[X][Y] + 1 < S * (tmp[x][y] - T) && D[x][y] == inf)
            {
                D[x][y] = D[X][Y] + 1;
                q.push({x, y});
            }
        }
    }
    return 0;
}

int main()
{
//    freopen("input", "r", stdin);
    cin.sync_with_stdio(false);

    cin >> n >> S;
    int i;
    for(i=1; i<=n; ++i) cin >> (a[i] + 1);

    prec();

    int st, dr, mid;
    st = 0; dr = n * n;
    while(st <= dr)
    {
        mid = (st + dr) / 2;
        if(check(mid)) st = mid + 1;
            else dr = mid - 1;
    }
    cout << dr << '\n';

    return 0;
}

Compilation message

mecho.cpp: In function 'bool check(int)':
mecho.cpp:64:22: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(!(T < tmp[x][y])) return 0;
              ~~~~~~~~^
mecho.cpp:64:22: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 184 ms 6776 KB Output is correct
8 Correct 2 ms 512 KB Output is correct
9 Correct 2 ms 512 KB Output is correct
10 Correct 2 ms 512 KB Output is correct
11 Correct 3 ms 512 KB Output is correct
12 Correct 2 ms 768 KB Output is correct
13 Correct 2 ms 768 KB Output is correct
14 Correct 2 ms 768 KB Output is correct
15 Correct 2 ms 512 KB Output is correct
16 Correct 2 ms 512 KB Output is correct
17 Correct 3 ms 512 KB Output is correct
18 Correct 2 ms 512 KB Output is correct
19 Correct 2 ms 512 KB Output is correct
20 Correct 3 ms 640 KB Output is correct
21 Correct 2 ms 640 KB Output is correct
22 Correct 2 ms 640 KB Output is correct
23 Correct 2 ms 768 KB Output is correct
24 Correct 2 ms 640 KB Output is correct
25 Correct 2 ms 768 KB Output is correct
26 Correct 3 ms 768 KB Output is correct
27 Correct 3 ms 896 KB Output is correct
28 Correct 3 ms 768 KB Output is correct
29 Correct 2 ms 896 KB Output is correct
30 Correct 2 ms 768 KB Output is correct
31 Correct 3 ms 1024 KB Output is correct
32 Correct 4 ms 896 KB Output is correct
33 Correct 8 ms 2816 KB Output is correct
34 Correct 8 ms 2876 KB Output is correct
35 Correct 27 ms 2944 KB Output is correct
36 Correct 9 ms 3200 KB Output is correct
37 Correct 11 ms 3328 KB Output is correct
38 Correct 32 ms 3328 KB Output is correct
39 Correct 10 ms 3584 KB Output is correct
40 Correct 10 ms 3712 KB Output is correct
41 Correct 52 ms 3816 KB Output is correct
42 Correct 12 ms 3968 KB Output is correct
43 Correct 11 ms 4224 KB Output is correct
44 Correct 65 ms 4096 KB Output is correct
45 Correct 15 ms 4224 KB Output is correct
46 Correct 15 ms 4608 KB Output is correct
47 Correct 72 ms 4608 KB Output is correct
48 Correct 14 ms 4608 KB Output is correct
49 Correct 16 ms 4992 KB Output is correct
50 Correct 75 ms 4992 KB Output is correct
51 Correct 16 ms 4992 KB Output is correct
52 Correct 18 ms 5504 KB Output is correct
53 Correct 93 ms 5376 KB Output is correct
54 Correct 20 ms 5376 KB Output is correct
55 Correct 21 ms 5760 KB Output is correct
56 Correct 135 ms 5880 KB Output is correct
57 Correct 23 ms 5760 KB Output is correct
58 Correct 23 ms 6272 KB Output is correct
59 Correct 154 ms 6264 KB Output is correct
60 Correct 34 ms 6016 KB Output is correct
61 Correct 26 ms 6648 KB Output is correct
62 Correct 239 ms 6648 KB Output is correct
63 Correct 132 ms 6648 KB Output is correct
64 Correct 238 ms 6732 KB Output is correct
65 Correct 197 ms 6648 KB Output is correct
66 Correct 165 ms 6776 KB Output is correct
67 Correct 164 ms 6648 KB Output is correct
68 Correct 77 ms 6648 KB Output is correct
69 Correct 72 ms 6624 KB Output is correct
70 Correct 54 ms 6648 KB Output is correct
71 Correct 56 ms 6648 KB Output is correct
72 Correct 48 ms 6648 KB Output is correct
73 Correct 67 ms 6904 KB Output is correct
74 Correct 79 ms 6904 KB Output is correct
75 Correct 99 ms 7004 KB Output is correct
76 Correct 90 ms 6904 KB Output is correct
77 Correct 105 ms 6876 KB Output is correct
78 Correct 105 ms 6912 KB Output is correct
79 Correct 65 ms 6892 KB Output is correct
80 Correct 106 ms 6904 KB Output is correct
81 Correct 119 ms 6912 KB Output is correct
82 Correct 115 ms 6904 KB Output is correct
83 Correct 135 ms 6912 KB Output is correct
84 Correct 123 ms 6884 KB Output is correct
85 Correct 116 ms 7032 KB Output is correct
86 Correct 112 ms 6904 KB Output is correct
87 Correct 97 ms 6912 KB Output is correct
88 Correct 125 ms 6868 KB Output is correct
89 Correct 145 ms 6892 KB Output is correct
90 Correct 118 ms 6864 KB Output is correct
91 Correct 111 ms 6872 KB Output is correct
92 Correct 110 ms 6776 KB Output is correct