oj.uz

Submission #978134

# Submission time Handle Problem Language Result Execution time Memory
978134 2024-05-08T22:15:21 Z Bodisha Mecho (IOI09_mecho) C++17
54 / 100
 279 ms 7248 KB 
#include <bits/stdc++.h>
#define MAX_N 801
#define UNVISITED 0
#define BEAR 1
#define BEE 2

using namespace std;

int n, s;
char grid[MAX_N][MAX_N];
int visited[MAX_N][MAX_N];
int beed[MAX_N][MAX_N];

bool check(int t) {
    pair<int, int> mecho_pos;
    pair<int, int> home_pos;
    vector<pair<int, int>> hive_edges;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            visited[i][j] = UNVISITED;
            beed[i][j] = -69;
            if(grid[i][j] == 'H') {
                hive_edges.push_back({i, j});
            }
            if(grid[i][j] == 'M') {
                mecho_pos = {i, j};
            }
            if(grid[i][j] == 'D') {
                home_pos = {i, j};
            }
        }
    }
    queue<pair<int, int>> beeq;
    vector<pair<int, int>> bees_edge;
    for(auto iter : hive_edges) {
        visited[iter.first][iter.second] = BEE;
        beed[iter.first][iter.second] = 0;
        beeq.push(iter);
    }
    while(!beeq.empty()) {
        pair<int, int> curr = beeq.front();
        beeq.pop();
        if(beed[curr.first][curr.second] == t) {
            bees_edge.push_back(curr);
            continue;
        }
        if(visited[curr.first + 1][curr.second] == UNVISITED && (grid[curr.first + 1][curr.second] == 'G' || grid[curr.first + 1][curr.second] == 'M')) {
            visited[curr.first + 1][curr.second] = BEE;
            beed[curr.first + 1][curr.second] = beed[curr.first][curr.second] + 1;
            beeq.push({curr.first + 1, curr.second});
        }
        if(visited[curr.first - 1][curr.second] == UNVISITED && (grid[curr.first - 1][curr.second] == 'G' || grid[curr.first - 1][curr.second] == 'M')) {
            visited[curr.first - 1][curr.second] = BEE;
            beed[curr.first - 1][curr.second] = beed[curr.first][curr.second] + 1;
            beeq.push({curr.first - 1, curr.second});
        }
        if(visited[curr.first][curr.second + 1] == UNVISITED && (grid[curr.first][curr.second + 1] == 'G' || grid[curr.first][curr.second + 1] == 'M')) {
            visited[curr.first][curr.second + 1] = BEE;
            beed[curr.first][curr.second + 1] = beed[curr.first][curr.second] + 1;
            beeq.push({curr.first, curr.second + 1});
        }
        if(visited[curr.first][curr.second - 1] == UNVISITED && (grid[curr.first][curr.second - 1] == 'G' || grid[curr.first][curr.second - 1] == 'M')) {
            visited[curr.first][curr.second - 1] = BEE;
            beed[curr.first][curr.second - 1] = beed[curr.first][curr.second] + 1;
            beeq.push({curr.first, curr.second - 1});
        }
    }
    if(visited[mecho_pos.first][mecho_pos.second] == BEE) {
        return false;
    }
    set<pair<int, int>> mecho_edge;
    mecho_edge.insert(mecho_pos);
    bool found = false;
    while(!found) {
        if(mecho_edge.size() == 0) {
            return false;
        }
        queue<pair<pair<int, int>, int>> q; // mecho queue
        for(auto iter : mecho_edge) {
            visited[iter.first][iter.second] = BEAR;
            q.push({iter, 0});
        }
        mecho_edge.clear();
        while(!q.empty()) {
            pair<pair<int, int>, int> curr = q.front();
            q.pop();
            if(curr.first.first + 1 < n && visited[curr.first.first + 1][curr.first.second] == UNVISITED && (grid[curr.first.first + 1][curr.first.second] == 'G' || grid[curr.first.first + 1][curr.first.second] == 'D')){
                if(curr.second == s - 1) {
                    visited[curr.first.first + 1][curr.first.second] = BEAR;
                    mecho_edge.insert({curr.first.first + 1, curr.first.second});
                } else {
                    visited[curr.first.first + 1][curr.first.second] = BEAR;
                    q.push({{curr.first.first + 1, curr.first.second}, curr.second + 1});
                }
            }
            if(curr.first.first - 1 >= 0 && visited[curr.first.first - 1][curr.first.second] == UNVISITED && (grid[curr.first.first - 1][curr.first.second] == 'G' || grid[curr.first.first - 1][curr.first.second] == 'D')){
                if(curr.second == s - 1) {
                    visited[curr.first.first - 1][curr.first.second] = BEAR;
                    mecho_edge.insert({curr.first.first - 1, curr.first.second});
                } else {
                    visited[curr.first.first - 1][curr.first.second] = BEAR;
                    q.push({{curr.first.first - 1, curr.first.second}, curr.second + 1});
                }
            }
            if(curr.first.second + 1 < n && visited[curr.first.first][curr.first.second + 1] == UNVISITED && (grid[curr.first.first][curr.first.second + 1] == 'G' || grid[curr.first.first][curr.first.second + 1] == 'D')){
                if(curr.second == s - 1) {
                    visited[curr.first.first][curr.first.second + 1] = BEAR;
                    mecho_edge.insert({curr.first.first, curr.first.second + 1});
                } else {
                    visited[curr.first.first][curr.first.second + 1] = BEAR;
                    q.push({{curr.first.first, curr.first.second + 1}, curr.second + 1});
                }
            }
            if(curr.first.second - 1 >= 0 && visited[curr.first.first][curr.first.second - 1] == UNVISITED && (grid[curr.first.first][curr.first.second - 1] == 'G' || grid[curr.first.first][curr.first.second - 1] == 'D')){
                if(curr.second == s - 1) {
                    visited[curr.first.first][curr.first.second - 1] = BEAR;
                    mecho_edge.insert({curr.first.first, curr.first.second - 1});
                } else {
                    visited[curr.first.first][curr.first.second - 1] = BEAR;
                    q.push({{curr.first.first, curr.first.second - 1}, curr.second + 1});
                }
            }
        }
        if(visited[home_pos.first][home_pos.second] == BEAR) {
            found = true;
            break;
        }
        vector<pair<int, int>> tmpedge;
        for(auto iter : bees_edge) {
            if(iter.first + 1 < n && visited[iter.first + 1][iter.second] == UNVISITED && grid[iter.first + 1][iter.second] == 'G') {
                visited[iter.first + 1][iter.second] = true;
                tmpedge.push_back({iter.first + 1, iter.second});
            }
            if(iter.first - 1 >= 0 && visited[iter.first - 1][iter.second] == UNVISITED && grid[iter.first - 1][iter.second] == 'G') {
                visited[iter.first - 1][iter.second] = true;
                tmpedge.push_back({iter.first - 1, iter.second});
            }
            if(iter.second + 1 < n && visited[iter.first][iter.second + 1] == UNVISITED && grid[iter.first][iter.second + 1] == 'G') {
                visited[iter.first][iter.second + 1] = true;
                tmpedge.push_back({iter.first, iter.second + 1});
            }
            if(iter.second - 1 >= 0 && visited[iter.first][iter.second - 1] == UNVISITED && grid[iter.first][iter.second - 1] == 'G') {
                visited[iter.first][iter.second - 1] = true;
                tmpedge.push_back({iter.first, iter.second - 1});
            }
        }
        bees_edge.clear();
        bees_edge = tmpedge;
    }
    if(found) {
        return true;
    } else {
        return false;
    }
}

int main() {
    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];
        }
    }
    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
54.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Incorrect 1 ms 2396 KB Output isn't correct
3 Incorrect 1 ms 2396 KB Output isn't correct
4 Incorrect 1 ms 2396 KB Output isn't correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 207 ms 6496 KB Output is correct
8 Incorrect 1 ms 2396 KB Output isn't correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 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 4696 KB Output is correct
15 Incorrect 1 ms 2392 KB Output isn't correct
16 Correct 1 ms 2484 KB Output is correct
17 Incorrect 1 ms 2396 KB Output isn't correct
18 Correct 1 ms 2396 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 2652 KB Output is correct
23 Incorrect 1 ms 2652 KB Output isn't correct
24 Correct 1 ms 2652 KB Output is correct
25 Incorrect 2 ms 4700 KB Output isn't correct
26 Correct 1 ms 4700 KB Output is correct
27 Incorrect 1 ms 4700 KB Output isn't correct
28 Correct 1 ms 4700 KB Output is correct
29 Incorrect 1 ms 4700 KB Output isn't correct
30 Correct 1 ms 4700 KB Output is correct
31 Incorrect 2 ms 4700 KB Output isn't correct
32 Correct 1 ms 4700 KB Output is correct
33 Incorrect 21 ms 4932 KB Output isn't correct
34 Correct 17 ms 4952 KB Output is correct
35 Correct 21 ms 4956 KB Output is correct
36 Incorrect 30 ms 4956 KB Output isn't correct
37 Correct 22 ms 5024 KB Output is correct
38 Correct 30 ms 4956 KB Output is correct
39 Incorrect 36 ms 5072 KB Output isn't correct
40 Correct 25 ms 4956 KB Output is correct
41 Correct 37 ms 4952 KB Output is correct
42 Incorrect 48 ms 4956 KB Output isn't correct
43 Correct 35 ms 4952 KB Output is correct
44 Correct 46 ms 5112 KB Output is correct
45 Incorrect 54 ms 4952 KB Output isn't correct
46 Correct 37 ms 5116 KB Output is correct
47 Correct 55 ms 5144 KB Output is correct
48 Incorrect 64 ms 5212 KB Output isn't correct
49 Correct 54 ms 5212 KB Output is correct
50 Correct 70 ms 5288 KB Output is correct
51 Incorrect 75 ms 5464 KB Output isn't correct
52 Correct 58 ms 5464 KB Output is correct
53 Correct 78 ms 5512 KB Output is correct
54 Incorrect 89 ms 5672 KB Output isn't correct
55 Correct 63 ms 5464 KB Output is correct
56 Correct 93 ms 5468 KB Output is correct
57 Incorrect 100 ms 5724 KB Output isn't correct
58 Correct 78 ms 5868 KB Output is correct
59 Correct 108 ms 5900 KB Output is correct
60 Incorrect 120 ms 6060 KB Output isn't correct
61 Correct 86 ms 5932 KB Output is correct
62 Correct 124 ms 6068 KB Output is correct
63 Correct 252 ms 6332 KB Output is correct
64 Correct 215 ms 6092 KB Output is correct
65 Correct 248 ms 5980 KB Output is correct
66 Incorrect 279 ms 6088 KB Output isn't correct
67 Correct 274 ms 6108 KB Output is correct
68 Correct 220 ms 6352 KB Output is correct
69 Correct 197 ms 5980 KB Output is correct
70 Correct 199 ms 6112 KB Output is correct
71 Correct 222 ms 6100 KB Output is correct
72 Correct 235 ms 5976 KB Output is correct
73 Correct 146 ms 7248 KB Output is correct
74 Correct 181 ms 6236 KB Output is correct
75 Correct 201 ms 6404 KB Output is correct
76 Correct 186 ms 6232 KB Output is correct
77 Correct 178 ms 6384 KB Output is correct
78 Correct 186 ms 7248 KB Output is correct
79 Correct 177 ms 6236 KB Output is correct
80 Correct 186 ms 6236 KB Output is correct
81 Correct 189 ms 6724 KB Output is correct
82 Correct 192 ms 6236 KB Output is correct
83 Correct 193 ms 7116 KB Output is correct
84 Correct 194 ms 6236 KB Output is correct
85 Correct 195 ms 6232 KB Output is correct
86 Correct 195 ms 6236 KB Output is correct
87 Correct 196 ms 6552 KB Output is correct
88 Correct 190 ms 6936 KB Output is correct
89 Correct 178 ms 6232 KB Output is correct
90 Correct 179 ms 6480 KB Output is correct
91 Correct 179 ms 6488 KB Output is correct
92 Correct 192 ms 6768 KB Output is correct