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Submission #978536

# Submission time Handle Problem Language Result Execution time Memory
978536 2024-05-09T10:09:46 Z Bodisha Mecho (IOI09_mecho) C++17
72 / 100
 1000 ms 7508 KB 
#include <bits/stdc++.h>
#define MAX_N 801
 
using namespace std;
 
int n, s;
char grid[MAX_N][MAX_N];
bool visited[MAX_N][MAX_N];
int beed[MAX_N][MAX_N];
int steps[MAX_N][MAX_N];
 
bool check(int t) {
    pair<int, int> mecho_pos, home_pos;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            visited[i][j] = false;
            steps[i][j] = n * n;
            if(grid[i][j] == 'M') {
                mecho_pos = {i, j};
            }
            if(grid[i][j] == 'D') {
                home_pos = {i, j};
            }
        }
    }
    queue<pair<int, int>> q;
    visited[mecho_pos.first][mecho_pos.second] = true;
    steps[mecho_pos.first][mecho_pos.second] = 0;
    q.push(mecho_pos);
    while(!q.empty()) {
        pair<int, int> curr = q.front(); 
        q.pop();
        if(curr.first + 1 < n && !visited[curr.first + 1][curr.second] && (grid[curr.first + 1][curr.second] == 'G' || grid[curr.first + 1][curr.second] == 'M' || grid[curr.first + 1][curr.second] == 'D')) {
            visited[curr.first + 1][curr.second] = true;
            steps[curr.first + 1][curr.second] = steps[curr.first][curr.second] + 1;
            q.push({curr.first + 1, curr.second});
        }
        if(curr.first - 1 >= 0 && !visited[curr.first - 1][curr.second] && (grid[curr.first - 1][curr.second] == 'G' || grid[curr.first - 1][curr.second] == 'M' || grid[curr.first - 1][curr.second] == 'D')) {
            visited[curr.first - 1][curr.second] = true;
            steps[curr.first - 1][curr.second] = steps[curr.first][curr.second] + 1;
            q.push({curr.first - 1, curr.second});
        }
        if(curr.second + 1 < n && !visited[curr.first][curr.second + 1] && (grid[curr.first][curr.second + 1] == 'G' || grid[curr.first][curr.second + 1] == 'M' || grid[curr.first][curr.second + 1] == 'D')) {
            visited[curr.first][curr.second + 1] = true;
            steps[curr.first][curr.second + 1] = steps[curr.first][curr.second] + 1;
            q.push({curr.first, curr.second + 1});
        }
        if(curr.second - 1 >= 0 && !visited[curr.first][curr.second - 1] && (grid[curr.first][curr.second - 1] == 'G' || grid[curr.first][curr.second - 1] == 'M' || grid[curr.first][curr.second - 1] == 'D')) {
            visited[curr.first][curr.second - 1] = true;
            steps[curr.first][curr.second - 1] = steps[curr.first][curr.second] + 1;
            q.push({curr.first, curr.second - 1});
        }
    }
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            visited[i][j] = false;
        }
    }
    if(t + 1 > beed[mecho_pos.first][mecho_pos.second]) {
        return false;
    }
    queue<pair<pair<int, int>, int>> newq;
    visited[mecho_pos.first][mecho_pos.second] = true;
    newq.push({mecho_pos, 0});
    while(!newq.empty()) {
        pair<pair<int, int>, int> curr = newq.front(); 
        newq.pop();
        int tmp = t + 1 + ((curr.second + 1) / (s));
        if(curr.first.first + 1 < n && tmp <= beed[curr.first.first + 1][curr.first.second] && !visited[curr.first.first + 1][curr.first.second] && (grid[curr.first.first + 1][curr.first.second] == 'G' || grid[curr.first.first + 1][curr.first.second] == 'M' || grid[curr.first.first + 1][curr.first.second] == 'D')) {
            visited[curr.first.first + 1][curr.first.second] = true;
            newq.push({{curr.first.first + 1, curr.first.second}, curr.second + 1});
        }
        if(curr.first.first - 1 >= 0 && tmp <= beed[curr.first.first - 1][curr.first.second] && !visited[curr.first.first - 1][curr.second] && (grid[curr.first.first - 1][curr.first.second] == 'G' || grid[curr.first.first - 1][curr.first.second] == 'M' || grid[curr.first.first - 1][curr.first.second] == 'D')) {
            visited[curr.first.first - 1][curr.first.second] = true;
            newq.push({{curr.first.first - 1, curr.first.second}, curr.second + 1});
        }
        if(curr.first.second + 1 < n && tmp <= beed[curr.first.first][curr.first.second + 1] && !visited[curr.first.first][curr.first.second + 1] && (grid[curr.first.first][curr.first.second + 1] == 'G' || grid[curr.first.first][curr.first.second + 1] == 'M' || grid[curr.first.first][curr.first.second + 1] == 'D')) {
            visited[curr.first.first][curr.first.second + 1] = true;
            newq.push({{curr.first.first, curr.first.second + 1}, curr.second + 1});
        }
        if(curr.first.second - 1 >= 0 && tmp <= beed[curr.first.first][curr.first.second - 1] && !visited[curr.first.first][curr.first.second - 1] && (grid[curr.first.first][curr.first.second - 1] == 'G' || grid[curr.first.first][curr.first.second - 1] == 'M' || grid[curr.first.first][curr.first.second - 1] == 'D')) {
            visited[curr.first.first][curr.first.second - 1] = true;
            newq.push({{curr.first.first, curr.first.second - 1}, curr.second + 1});
        }
    }
    return visited[home_pos.first + 1][home_pos.second] || visited[home_pos.first - 1][home_pos.second] || visited[home_pos.first - 1][home_pos.second] || visited[home_pos.first][home_pos.second + 1] || visited[home_pos.first][home_pos.second - 1];
}
 
int main() {
    vector<pair<int, int>> hives;
    cin >> n >> s;
    for(int i = 0; i < n; i++) {
        string tmp;
        cin >> tmp;
        for(int j = 0; j < n; j++) {
            grid[i][j] = tmp[j];
            if(grid[i][j] == 'H') {
                hives.push_back({i, j});
            }
        }
    }
    queue<pair<int, int>> q;
    for(auto iter : hives) {
        visited[iter.first][iter.second] = true;
        beed[iter.first][iter.second] = 0;
        q.push(iter);
    }
    while(!q.empty()) {
        pair<int, int> curr = q.front(); 
        q.pop();
        if(curr.first + 1 < n && !visited[curr.first + 1][curr.second] && (grid[curr.first + 1][curr.second] == 'G' || grid[curr.first + 1][curr.second] == 'M')) {
            visited[curr.first + 1][curr.second] = true;
            beed[curr.first + 1][curr.second] = beed[curr.first][curr.second] + 1;
            q.push({curr.first + 1, curr.second});
        }
        if(curr.first - 1 >= 0 && !visited[curr.first - 1][curr.second] && (grid[curr.first - 1][curr.second] == 'G' || grid[curr.first - 1][curr.second] == 'M')) {
            visited[curr.first - 1][curr.second] = true;
            beed[curr.first - 1][curr.second] = beed[curr.first][curr.second] + 1;
            q.push({curr.first - 1, curr.second});
        }
        if(curr.second + 1 < n && !visited[curr.first][curr.second + 1] && (grid[curr.first][curr.second + 1] == 'G' || grid[curr.first][curr.second + 1] == 'M')) {
            visited[curr.first][curr.second + 1] = true;
            beed[curr.first][curr.second + 1] = beed[curr.first][curr.second] + 1;
            q.push({curr.first, curr.second + 1});
        }
        if(curr.second - 1 >= 0 && !visited[curr.first][curr.second - 1] && (grid[curr.first][curr.second - 1] == 'G' || grid[curr.first][curr.second - 1] == 'M')) {
            visited[curr.first][curr.second - 1] = true;
            beed[curr.first][curr.second - 1] = beed[curr.first][curr.second] + 1;
            q.push({curr.first, curr.second - 1});
        }
    }
    int l = 0, r = n * n;
    int ans = -1;
    // true true true ... (true) false false
    while(l <= r) {
        int mid = l + (r - l) / 2;
        if(check(mid)) {
            ans = mid;
            l = mid + 1;
        } else {
            r = mid - 1;
        }
    }
    cout << ans;
    return 0;
}

Subtask #1
72.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2392 KB Output is correct
7 Execution timed out 1058 ms 7088 KB Time limit exceeded
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2396 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 2 ms 4700 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2392 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2652 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2652 KB Output is correct
22 Correct 1 ms 2652 KB Output is correct
23 Correct 1 ms 2652 KB Output is correct
24 Correct 1 ms 2652 KB Output is correct
25 Correct 1 ms 4700 KB Output is correct
26 Correct 2 ms 4700 KB Output is correct
27 Correct 1 ms 4700 KB Output is correct
28 Correct 1 ms 4724 KB Output is correct
29 Correct 2 ms 4700 KB Output is correct
30 Correct 1 ms 4700 KB Output is correct
31 Correct 2 ms 4700 KB Output is correct
32 Correct 1 ms 4700 KB Output is correct
33 Correct 23 ms 5276 KB Output is correct
34 Correct 19 ms 5248 KB Output is correct
35 Correct 327 ms 5460 KB Output is correct
36 Correct 29 ms 5208 KB Output is correct
37 Correct 22 ms 5212 KB Output is correct
38 Correct 328 ms 5560 KB Output is correct
39 Correct 37 ms 5416 KB Output is correct
40 Correct 31 ms 5208 KB Output is correct
41 Correct 353 ms 5688 KB Output is correct
42 Correct 50 ms 5468 KB Output is correct
43 Correct 34 ms 5464 KB Output is correct
44 Correct 476 ms 6120 KB Output is correct
45 Correct 65 ms 5556 KB Output is correct
46 Correct 46 ms 5468 KB Output is correct
47 Correct 546 ms 6136 KB Output is correct
48 Correct 68 ms 5724 KB Output is correct
49 Correct 49 ms 5720 KB Output is correct
50 Correct 596 ms 6128 KB Output is correct
51 Correct 84 ms 5980 KB Output is correct
52 Correct 59 ms 5980 KB Output is correct
53 Correct 580 ms 6420 KB Output is correct
54 Correct 101 ms 6236 KB Output is correct
55 Correct 67 ms 6236 KB Output is correct
56 Correct 508 ms 6552 KB Output is correct
57 Correct 116 ms 6460 KB Output is correct
58 Correct 77 ms 6236 KB Output is correct
59 Correct 498 ms 6988 KB Output is correct
60 Correct 132 ms 6736 KB Output is correct
61 Correct 87 ms 6492 KB Output is correct
62 Incorrect 350 ms 6996 KB Output isn't correct
63 Incorrect 267 ms 6952 KB Output isn't correct
64 Incorrect 283 ms 6492 KB Output isn't correct
65 Incorrect 281 ms 6712 KB Output isn't correct
66 Incorrect 292 ms 6696 KB Output isn't correct
67 Correct 285 ms 6480 KB Output is correct
68 Incorrect 229 ms 6724 KB Output isn't correct
69 Incorrect 221 ms 6492 KB Output isn't correct
70 Incorrect 217 ms 6748 KB Output isn't correct
71 Incorrect 232 ms 6724 KB Output isn't correct
72 Correct 222 ms 6748 KB Output is correct
73 Correct 443 ms 7504 KB Output is correct
74 Execution timed out 1052 ms 7192 KB Time limit exceeded
75 Execution timed out 1050 ms 7188 KB Time limit exceeded
76 Execution timed out 1057 ms 7308 KB Time limit exceeded
77 Execution timed out 1029 ms 7364 KB Time limit exceeded
78 Execution timed out 1028 ms 7292 KB Time limit exceeded
79 Execution timed out 1045 ms 7400 KB Time limit exceeded
80 Execution timed out 1016 ms 7188 KB Time limit exceeded
81 Execution timed out 1053 ms 7472 KB Time limit exceeded
82 Execution timed out 1022 ms 7236 KB Time limit exceeded
83 Correct 884 ms 7468 KB Output is correct
84 Correct 786 ms 6960 KB Output is correct
85 Correct 780 ms 7508 KB Output is correct
86 Correct 856 ms 6920 KB Output is correct
87 Correct 869 ms 7192 KB Output is correct
88 Correct 964 ms 7124 KB Output is correct
89 Correct 919 ms 7000 KB Output is correct
90 Correct 959 ms 7088 KB Output is correct
91 Correct 982 ms 7092 KB Output is correct
92 Execution timed out 1046 ms 6872 KB Time limit exceeded