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Submission #977529

# Submission time Handle Problem Language Result Execution time Memory
977529 2024-05-08T06:20:57 Z farica Mecho (IOI09_mecho) C++14
25 / 100
 1000 ms 7252 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=n*n, 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
25.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Incorrect 0 ms 484 KB Output isn't correct
3 Incorrect 1 ms 348 KB Output isn't correct
4 Incorrect 0 ms 348 KB Output isn't correct
5 Correct 0 ms 344 KB Output is correct
6 Incorrect 1 ms 344 KB Output isn't correct
7 Execution timed out 1089 ms 6468 KB Time limit exceeded
8 Incorrect 1 ms 756 KB Output isn't correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 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 Incorrect 1 ms 2904 KB Output isn't 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 2540 KB Output is correct
19 Incorrect 1 ms 2396 KB Output isn't correct
20 Correct 1 ms 2536 KB Output is correct
21 Incorrect 1 ms 2652 KB Output isn't correct
22 Correct 1 ms 2652 KB Output is correct
23 Incorrect 1 ms 2652 KB Output isn't correct
24 Correct 1 ms 2648 KB Output is correct
25 Incorrect 1 ms 2652 KB Output isn't correct
26 Correct 1 ms 2652 KB Output is correct
27 Incorrect 2 ms 2652 KB Output isn't correct
28 Correct 1 ms 2652 KB Output is correct
29 Incorrect 2 ms 2652 KB Output isn't correct
30 Correct 1 ms 2652 KB Output is correct
31 Incorrect 1 ms 2652 KB Output isn't correct
32 Correct 1 ms 2652 KB Output is correct
33 Incorrect 2 ms 2740 KB Output isn't correct
34 Correct 3 ms 2904 KB Output is correct
35 Correct 205 ms 2960 KB Output is correct
36 Incorrect 3 ms 4972 KB Output isn't correct
37 Correct 4 ms 4956 KB Output is correct
38 Correct 272 ms 5060 KB Output is correct
39 Incorrect 3 ms 4956 KB Output isn't correct
40 Correct 5 ms 5208 KB Output is correct
41 Correct 389 ms 5188 KB Output is correct
42 Incorrect 4 ms 5208 KB Output isn't correct
43 Correct 5 ms 5212 KB Output is correct
44 Correct 478 ms 5260 KB Output is correct
45 Incorrect 5 ms 5212 KB Output isn't correct
46 Correct 5 ms 5212 KB Output is correct
47 Correct 541 ms 5400 KB Output is correct
48 Incorrect 5 ms 5212 KB Output isn't correct
49 Correct 6 ms 5332 KB Output is correct
50 Correct 668 ms 5452 KB Output is correct
51 Incorrect 6 ms 5720 KB Output isn't correct
52 Correct 6 ms 5468 KB Output is correct
53 Correct 793 ms 5716 KB Output is correct
54 Incorrect 8 ms 5724 KB Output isn't correct
55 Correct 8 ms 5724 KB Output is correct
56 Correct 977 ms 5860 KB Output is correct
57 Incorrect 8 ms 6072 KB Output isn't correct
58 Correct 9 ms 6232 KB Output is correct
59 Execution timed out 1026 ms 6268 KB Time limit exceeded
60 Incorrect 9 ms 6492 KB Output isn't correct
61 Correct 9 ms 6636 KB Output is correct
62 Execution timed out 1027 ms 6744 KB Time limit exceeded
63 Correct 408 ms 6812 KB Output is correct
64 Correct 856 ms 6676 KB Output is correct
65 Correct 633 ms 6736 KB Output is correct
66 Incorrect 525 ms 6492 KB Output isn't correct
67 Correct 55 ms 6492 KB Output is correct
68 Correct 109 ms 6716 KB Output is correct
69 Correct 109 ms 6560 KB Output is correct
70 Correct 55 ms 6492 KB Output is correct
71 Correct 73 ms 6712 KB Output is correct
72 Incorrect 27 ms 6492 KB Output isn't correct
73 Incorrect 321 ms 7116 KB Output isn't correct
74 Correct 660 ms 7120 KB Output is correct
75 Correct 796 ms 7248 KB Output is correct
76 Correct 632 ms 7084 KB Output is correct
77 Correct 644 ms 7004 KB Output is correct
78 Correct 126 ms 7248 KB Output is correct
79 Correct 523 ms 7080 KB Output is correct
80 Correct 635 ms 6992 KB Output is correct
81 Correct 754 ms 7024 KB Output is correct
82 Correct 642 ms 7252 KB Output is correct
83 Correct 949 ms 6980 KB Output is correct
84 Correct 902 ms 6816 KB Output is correct
85 Correct 949 ms 6976 KB Output is correct
86 Correct 896 ms 6992 KB Output is correct
87 Correct 933 ms 7000 KB Output is correct
88 Correct 983 ms 6900 KB Output is correct
89 Execution timed out 1042 ms 6996 KB Time limit exceeded
90 Execution timed out 1042 ms 6808 KB Time limit exceeded
91 Execution timed out 1008 ms 6748 KB Time limit exceeded
92 Execution timed out 1020 ms 6724 KB Time limit exceeded