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Submission #977539

# Submission time Handle Problem Language Result Execution time Memory
977539 2024-05-08T06:30:20 Z farica Mecho (IOI09_mecho) C++14
36 / 100
 1000 ms 6740 KB 
#include <bits/stdc++.h>
#define int long long

using namespace std;

const int MAX_N = 4e5 + 5;

int n, s, dist[800][800], sx, sy;
string grid[800];

bool test(int m) {
    priority_queue<pair<int, pair<int,int>>>pq;
    vector<vector<bool>>visited(n, vector<bool>(n, 0));
    pq.push({0, {sx, sy}});
    while(!pq.empty()) {
        int x = pq.top().second.first, y = pq.top().second.second, cnt = -1 * pq.top().first;
        pq.pop();
        if(visited[x][y]) continue;
        visited[x][y] = 1;
        if(grid[x][y] == 'D') return true;
        int cost = ((cnt+1) / s) + ((cnt+1) % s > 0 ? 1 : 0) + m;
        if(x && grid[x-1][y] != 'T' && dist[x-1][y] >= cost) pq.push({(cnt + 1) * -1, {x-1, y}});
        if(y && grid[x][y-1] != 'T' && dist[x][y-1] >= cost) pq.push({(cnt + 1) * -1, {x, y-1}});
        if(x+1<n && grid[x+1][y] != 'T' && dist[x+1][y] >= cost) pq.push({(cnt + 1) * -1, {x+1, y}});
        if(y+1<n && grid[x][y+1] != 'T' && dist[x][y+1] >= cost) pq.push({(cnt + 1) * -1, {x, y+1}});
    }
    return false;
}

void solve() {
    cin >> n >> s;
    queue<pair<int,int>>q;
    for(int i=0; i<n; ++i) {
        cin >> grid[i];
        for(int j=0; j<n; ++j) {
            dist[i][j] = -1;
            if(grid[i][j] == 'H') {
                q.push({i, j});
                dist[i][j] = 0;
            } else if(grid[i][j] == 'M') sx=i, sy=j;
        }
    }
    while(!q.empty()) {
        int i = q.front().first, j = q.front().second;
        q.pop();
        if(i && dist[i-1][j] == -1 && grid[i-1][j] != 'T') {
            dist[i-1][j] = dist[i][j] + 1;
            q.push({i-1, j});
        }
        if(j && dist[i][j-1] == -1 && grid[i][j-1] != 'T') {
            dist[i][j-1] = dist[i][j] + 1;
            q.push({i, j-1});
        }
        if(i<n-1 && dist[i+1][j] == -1 && grid[i+1][j] != 'T') {
            dist[i+1][j] = dist[i][j] + 1;
            q.push({i+1, j});
        }
        if(j<n-1 && dist[i][j+1] == -1 && grid[i][j+1] != 'T') {
            dist[i][j+1] = dist[i][j] + 1;
            q.push({i, j+1});
        }
    }
    if(!test(0)) {
        cout << -1 << endl;
        return;
    }
    int l=0, r=dist[sx][sy]-1, mid;
    while(l<=r) {
        mid = (l+r)/2;
        if(test(mid)) l = mid + 1;
        else r = mid - 1;
    }
    cout << l - 1 << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    while(t--) solve();

    return 0;
}

Subtask #1
36.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Incorrect 0 ms 348 KB Output isn't correct
5 Correct 0 ms 348 KB Output is correct
6 Incorrect 0 ms 348 KB Output isn't correct
7 Execution timed out 1046 ms 6712 KB Time limit exceeded
8 Incorrect 1 ms 344 KB Output isn't correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Incorrect 1 ms 2652 KB Output isn't correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Incorrect 0 ms 348 KB Output isn't correct
16 Correct 0 ms 348 KB Output is correct
17 Incorrect 1 ms 2396 KB Output isn't correct
18 Correct 1 ms 2392 KB Output is correct
19 Incorrect 1 ms 2396 KB Output isn't correct
20 Correct 1 ms 2396 KB Output is correct
21 Incorrect 1 ms 2652 KB Output isn't correct
22 Correct 1 ms 2396 KB Output is correct
23 Incorrect 1 ms 2396 KB Output isn't correct
24 Correct 1 ms 2652 KB Output is correct
25 Incorrect 2 ms 2652 KB Output isn't correct
26 Correct 1 ms 2652 KB Output is correct
27 Incorrect 1 ms 2652 KB Output isn't correct
28 Correct 1 ms 2652 KB Output is correct
29 Incorrect 1 ms 2652 KB Output isn't correct
30 Correct 1 ms 2652 KB Output is correct
31 Incorrect 2 ms 2652 KB Output isn't correct
32 Correct 1 ms 2648 KB Output is correct
33 Incorrect 2 ms 2648 KB Output isn't correct
34 Correct 3 ms 2652 KB Output is correct
35 Correct 196 ms 2652 KB Output is correct
36 Incorrect 3 ms 4700 KB Output isn't correct
37 Correct 4 ms 4700 KB Output is correct
38 Correct 262 ms 4956 KB Output is correct
39 Incorrect 4 ms 4956 KB Output isn't correct
40 Correct 5 ms 4956 KB Output is correct
41 Correct 345 ms 5036 KB Output is correct
42 Incorrect 4 ms 4952 KB Output isn't correct
43 Correct 4 ms 4956 KB Output is correct
44 Correct 448 ms 5080 KB Output is correct
45 Incorrect 4 ms 4956 KB Output isn't correct
46 Correct 5 ms 4956 KB Output is correct
47 Correct 534 ms 5388 KB Output is correct
48 Incorrect 7 ms 5208 KB Output isn't correct
49 Correct 6 ms 4956 KB Output is correct
50 Correct 629 ms 5516 KB Output is correct
51 Incorrect 6 ms 5212 KB Output isn't correct
52 Correct 6 ms 5212 KB Output is correct
53 Correct 805 ms 5596 KB Output is correct
54 Incorrect 7 ms 5468 KB Output isn't correct
55 Correct 8 ms 5464 KB Output is correct
56 Correct 914 ms 5712 KB Output is correct
57 Incorrect 8 ms 5720 KB Output isn't correct
58 Correct 8 ms 5720 KB Output is correct
59 Execution timed out 1068 ms 5980 KB Time limit exceeded
60 Incorrect 9 ms 6244 KB Output isn't correct
61 Correct 9 ms 6276 KB Output is correct
62 Execution timed out 1027 ms 6300 KB Time limit exceeded
63 Correct 406 ms 6232 KB Output is correct
64 Correct 752 ms 6232 KB Output is correct
65 Correct 714 ms 6308 KB Output is correct
66 Incorrect 515 ms 6300 KB Output isn't correct
67 Correct 61 ms 6236 KB Output is correct
68 Correct 105 ms 6280 KB Output is correct
69 Correct 89 ms 6272 KB Output is correct
70 Correct 66 ms 6232 KB Output is correct
71 Correct 39 ms 6236 KB Output is correct
72 Correct 31 ms 6232 KB Output is correct
73 Correct 325 ms 6700 KB Output is correct
74 Correct 801 ms 6648 KB Output is correct
75 Correct 648 ms 6692 KB Output is correct
76 Correct 672 ms 6492 KB Output is correct
77 Correct 739 ms 6740 KB Output is correct
78 Correct 121 ms 6640 KB Output is correct
79 Correct 663 ms 6740 KB Output is correct
80 Correct 707 ms 6736 KB Output is correct
81 Correct 730 ms 6644 KB Output is correct
82 Correct 639 ms 6640 KB Output is correct
83 Correct 989 ms 6560 KB Output is correct
84 Correct 876 ms 6560 KB Output is correct
85 Correct 819 ms 6556 KB Output is correct
86 Correct 1000 ms 6564 KB Output is correct
87 Correct 850 ms 6740 KB Output is correct
88 Execution timed out 1036 ms 6468 KB Time limit exceeded
89 Execution timed out 1056 ms 6484 KB Time limit exceeded
90 Execution timed out 1068 ms 6740 KB Time limit exceeded
91 Execution timed out 1051 ms 6236 KB Time limit exceeded
92 Execution timed out 1042 ms 6232 KB Time limit exceeded