oj.uz

Submission #687222

# Submission time Handle Problem Language Result Execution time Memory
687222 2023-01-26T07:53:40 Z stevancv Mecho (IOI09_mecho) C++14
100 / 100
 206 ms 6944 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 800 + 2;
const int inf = 1e9;
string s[N];
int b[N][N], a[N][N], n, k;
int dx[4] = {-1, 0, 1, 0}, dy[4] = {0, -1, 0, 1};
bool Can(int x, int y) {
    if (x < 0 || x >= n) return 0;
    if (y < 0 || y >= n) return 0;
    if (s[x][y] == 'T') return 0;
    return 1;
}
bool Ok(int x, int y, int val, int m) {
    return (b[x][y] - val / k - m) > 0;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> k;
    for (int i = 0; i < n; i++) {
        cin >> s[i];
    }
    int ii, jj, iii, jjj;
    ii = jj = iii = jjj = -1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (s[i][j] == 'M') {
                ii = i;
                jj = j;
            }
            if (s[i][j] == 'D') {
                iii = i;
                jjj = j;
            }
        }
    }
    queue<pair<int, int>> q;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (s[i][j] == 'H') {
                q.push({i, j});
                b[i][j] = 0;
            }
            else b[i][j] = inf;
        }
    }
    while (!q.empty()) {
        auto u = q.front(); q.pop();
        for (int i = 0; i < 4; i++) {
            int nx = u.first + dx[i];
            int ny = u.second + dy[i];
            if (!Can(nx, ny) || (nx == iii && ny == jjj)) continue;
            if (b[nx][ny] > b[u.first][u.second] + 1) {
                q.push({nx, ny});
                b[nx][ny] = b[u.first][u.second] + 1;
            }
        }
    }
    auto Moze = [&] (int mid) {
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                a[i][j] = inf;
            }
        }
        if (mid >= b[iii][jjj]) return false;
        q.push({ii, jj});
        a[ii][jj] = 0;
        while (!q.empty()) {
            auto u = q.front(); q.pop();
            for (int i = 0; i < 4; i++) {
                int nx = u.first + dx[i];
                int ny = u.second + dy[i];
                if (!Can(nx, ny)) continue;
                if (Ok(nx, ny, a[u.first][u.second] + 1, mid) && a[nx][ny] > a[u.first][u.second] + 1) {
                    q.push({nx, ny});
                    a[nx][ny] = a[u.first][u.second] + 1;
                }
            }
        }
        return a[iii][jjj] != inf;
    };
    int l = 0, r = b[ii][jj] - 1, ans = -1;
    while (l <= r) {
        int mid = l + r >> 1;
        if (Moze(mid)) {
            l = mid + 1;
            ans = mid;
        }
        else r = mid - 1;
    }
    cout << ans << en;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:92:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   92 |         int mid = l + r >> 1;
      |                   ~~^~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 352 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 91 ms 6772 KB Output is correct
8 Correct 1 ms 420 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 488 KB Output is correct
18 Correct 1 ms 484 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 1 ms 612 KB Output is correct
23 Correct 1 ms 608 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 1 ms 724 KB Output is correct
26 Correct 1 ms 744 KB Output is correct
27 Correct 1 ms 740 KB Output is correct
28 Correct 1 ms 724 KB Output is correct
29 Correct 1 ms 724 KB Output is correct
30 Correct 1 ms 724 KB Output is correct
31 Correct 1 ms 724 KB Output is correct
32 Correct 1 ms 724 KB Output is correct
33 Correct 5 ms 2756 KB Output is correct
34 Correct 5 ms 2772 KB Output is correct
35 Correct 21 ms 2772 KB Output is correct
36 Correct 7 ms 3156 KB Output is correct
37 Correct 7 ms 3156 KB Output is correct
38 Correct 31 ms 3180 KB Output is correct
39 Correct 9 ms 3568 KB Output is correct
40 Correct 12 ms 3532 KB Output is correct
41 Correct 55 ms 3576 KB Output is correct
42 Correct 10 ms 3924 KB Output is correct
43 Correct 16 ms 3924 KB Output is correct
44 Correct 79 ms 3952 KB Output is correct
45 Correct 13 ms 4404 KB Output is correct
46 Correct 11 ms 4308 KB Output is correct
47 Correct 58 ms 4312 KB Output is correct
48 Correct 15 ms 4800 KB Output is correct
49 Correct 16 ms 4776 KB Output is correct
50 Correct 62 ms 4852 KB Output is correct
51 Correct 14 ms 5312 KB Output is correct
52 Correct 16 ms 5300 KB Output is correct
53 Correct 96 ms 5300 KB Output is correct
54 Correct 22 ms 5712 KB Output is correct
55 Correct 18 ms 5716 KB Output is correct
56 Correct 88 ms 5732 KB Output is correct
57 Correct 18 ms 6172 KB Output is correct
58 Correct 21 ms 6200 KB Output is correct
59 Correct 117 ms 6152 KB Output is correct
60 Correct 22 ms 6636 KB Output is correct
61 Correct 22 ms 6640 KB Output is correct
62 Correct 132 ms 6600 KB Output is correct
63 Correct 103 ms 6664 KB Output is correct
64 Correct 206 ms 6732 KB Output is correct
65 Correct 177 ms 6584 KB Output is correct
66 Correct 130 ms 6596 KB Output is correct
67 Correct 117 ms 6660 KB Output is correct
68 Correct 56 ms 6604 KB Output is correct
69 Correct 51 ms 6648 KB Output is correct
70 Correct 37 ms 6604 KB Output is correct
71 Correct 30 ms 6628 KB Output is correct
72 Correct 29 ms 6608 KB Output is correct
73 Correct 37 ms 6936 KB Output is correct
74 Correct 63 ms 6936 KB Output is correct
75 Correct 71 ms 6868 KB Output is correct
76 Correct 67 ms 6944 KB Output is correct
77 Correct 68 ms 6944 KB Output is correct
78 Correct 79 ms 6820 KB Output is correct
79 Correct 70 ms 6860 KB Output is correct
80 Correct 73 ms 6912 KB Output is correct
81 Correct 79 ms 6888 KB Output is correct
82 Correct 69 ms 6912 KB Output is correct
83 Correct 113 ms 6876 KB Output is correct
84 Correct 81 ms 6796 KB Output is correct
85 Correct 116 ms 6808 KB Output is correct
86 Correct 118 ms 6872 KB Output is correct
87 Correct 71 ms 6812 KB Output is correct
88 Correct 87 ms 6820 KB Output is correct
89 Correct 88 ms 6828 KB Output is correct
90 Correct 112 ms 6820 KB Output is correct
91 Correct 103 ms 6820 KB Output is correct
92 Correct 110 ms 6752 KB Output is correct