oj.uz

Submission #935004

# Submission time Handle Problem Language Result Execution time Memory
935004 2024-02-28T10:42:52 Z May27_th Mecho (IOI09_mecho) C++17
84 / 100
 136 ms 7000 KB 
#include<bits/stdc++.h>
#define taskname "A"
using namespace std;

void World_Final();
void Solve();

int main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    if (fopen(taskname".in", "r")) {
        freopen(taskname".in", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    World_Final();
}

void World_Final(){
    int Tests = 1;
    //cin >> Tests;
    while (Tests --) {
        Solve();
    }
}

const int MAXN = 805;
int N, S, bee[MAXN][MAXN], bear[MAXN][MAXN]; char G[MAXN][MAXN];
int dx[4] = {0, 0, 1, -1}, dy[4] = {1, -1, 0, 0};
pair<int, int> st, en;
bool query(int rest){
    memset(bear, -1, sizeof(bear));
    queue<pair<int, int>> q; q.push(st); bear[st.first][st.second] = 0;
    while (!q.empty()) {
        int u, v; tie(u, v) = q.front();
        //cout << u << " " << v << "\n";
        q.pop();
        for (int i = 0; i < 4; i ++) {
            int nu = u + dx[i];
            int nv = v + dy[i];
            if (nu >= 1 && nu <= N && nv >= 1 && nv <= N) {
                if (G[nu][nv] == 'G' && bear[nu][nv] == -1) {
                    int t = (bear[u][v] + 1)/S;
                    if (t < bee[nu][nv] - rest) {
                        bear[nu][nv] = bear[u][v] + 1;
                        q.push(make_pair(nu, nv));
                    }
                }
                if (G[nu][nv] == 'D' && bear[nu][nv] == -1) {
                    bear[nu][nv] = bear[u][v] + 1;
                    q.push(make_pair(nu, nv));
                }
            }
        }
    }
    return bear[en.first][en.second] != -1;

}
void Solve(){
    cin >> N >> S;
    for (int i = 1; i <= N; i ++) {
        for (int j = 1; j <= N; j ++) {
            cin >> G[i][j];
        }
    }

    memset(bee, -1, sizeof(bee)); queue<pair<int, int>> q;
    for (int i = 1; i <= N; i ++) {
        for (int j = 1; j <= N; j ++) {
            if (G[i][j] == 'H') {
                bee[i][j] = 0;
                q.push(make_pair(i, j));
            }
            if (G[i][j] == 'M') st = make_pair(i, j);
            if (G[i][j] == 'D') en = make_pair(i, j);
        }
    }
    while (!q.empty()) {
        int u, v; tie(u, v) = q.front();
        q.pop();
        for (int i = 0; i < 4; i ++) {
            int nu = u + dx[i];
            int nv = v + dy[i];
            if (nu >= 1 && nu <= N && nv >= 1 && nv <= N) {
                if ((G[nu][nv] == 'G' || G[nu][nv] == 'M') && bee[nu][nv] == -1) {
                    bee[nu][nv] = bee[u][v] + 1;
                    q.push(make_pair(nu, nv));
                }
            }
        }
    }
    int l = 0, h = 1e9;
    while (l <= h) {
        int mid = (l + h) / 2;
        //cout << mid << "\n";
        if (query(mid)) l = mid + 1;
        else h = mid - 1;
    } cout << h;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:11:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |         freopen(taskname".in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:12:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5980 KB Output is correct
2 Correct 3 ms 5980 KB Output is correct
3 Correct 3 ms 5980 KB Output is correct
4 Correct 3 ms 5980 KB Output is correct
5 Correct 3 ms 5980 KB Output is correct
6 Correct 3 ms 5980 KB Output is correct
7 Correct 75 ms 6128 KB Output is correct
8 Correct 3 ms 5980 KB Output is correct
9 Correct 3 ms 5980 KB Output is correct
10 Correct 3 ms 5980 KB Output is correct
11 Correct 3 ms 5980 KB Output is correct
12 Incorrect 3 ms 5980 KB Output isn't correct
13 Incorrect 3 ms 5980 KB Output isn't correct
14 Correct 3 ms 5836 KB Output is correct
15 Correct 3 ms 6008 KB Output is correct
16 Correct 3 ms 5980 KB Output is correct
17 Correct 3 ms 5980 KB Output is correct
18 Correct 3 ms 5980 KB Output is correct
19 Correct 3 ms 5980 KB Output is correct
20 Correct 3 ms 5980 KB Output is correct
21 Correct 3 ms 6020 KB Output is correct
22 Correct 3 ms 5980 KB Output is correct
23 Correct 3 ms 5980 KB Output is correct
24 Correct 3 ms 5976 KB Output is correct
25 Correct 3 ms 5980 KB Output is correct
26 Correct 3 ms 5980 KB Output is correct
27 Correct 3 ms 5976 KB Output is correct
28 Correct 3 ms 5980 KB Output is correct
29 Correct 3 ms 5980 KB Output is correct
30 Correct 3 ms 5980 KB Output is correct
31 Correct 3 ms 5980 KB Output is correct
32 Correct 3 ms 5976 KB Output is correct
33 Correct 5 ms 6236 KB Output is correct
34 Correct 6 ms 6096 KB Output is correct
35 Correct 18 ms 6236 KB Output is correct
36 Correct 6 ms 6232 KB Output is correct
37 Correct 6 ms 6236 KB Output is correct
38 Correct 22 ms 6248 KB Output is correct
39 Correct 7 ms 6236 KB Output is correct
40 Correct 9 ms 6236 KB Output is correct
41 Correct 30 ms 6236 KB Output is correct
42 Correct 7 ms 6236 KB Output is correct
43 Correct 7 ms 6188 KB Output is correct
44 Correct 37 ms 6208 KB Output is correct
45 Correct 9 ms 6232 KB Output is correct
46 Correct 8 ms 6236 KB Output is correct
47 Correct 43 ms 6360 KB Output is correct
48 Correct 10 ms 6232 KB Output is correct
49 Correct 11 ms 6168 KB Output is correct
50 Correct 63 ms 6332 KB Output is correct
51 Correct 12 ms 6236 KB Output is correct
52 Correct 12 ms 6236 KB Output is correct
53 Correct 68 ms 6488 KB Output is correct
54 Correct 15 ms 6232 KB Output is correct
55 Correct 15 ms 6488 KB Output is correct
56 Correct 77 ms 6460 KB Output is correct
57 Correct 13 ms 6232 KB Output is correct
58 Correct 13 ms 6492 KB Output is correct
59 Correct 81 ms 6504 KB Output is correct
60 Correct 15 ms 6488 KB Output is correct
61 Correct 17 ms 6488 KB Output is correct
62 Correct 96 ms 6488 KB Output is correct
63 Correct 80 ms 6532 KB Output is correct
64 Correct 136 ms 6488 KB Output is correct
65 Correct 132 ms 6564 KB Output is correct
66 Correct 109 ms 6488 KB Output is correct
67 Correct 82 ms 6488 KB Output is correct
68 Correct 37 ms 6492 KB Output is correct
69 Correct 37 ms 6380 KB Output is correct
70 Correct 27 ms 6488 KB Output is correct
71 Correct 28 ms 6488 KB Output is correct
72 Incorrect 25 ms 6492 KB Output isn't correct
73 Incorrect 26 ms 6744 KB Output isn't correct
74 Correct 48 ms 6748 KB Output is correct
75 Correct 53 ms 6744 KB Output is correct
76 Correct 47 ms 6748 KB Output is correct
77 Correct 53 ms 6744 KB Output is correct
78 Correct 64 ms 6804 KB Output is correct
79 Correct 43 ms 6624 KB Output is correct
80 Correct 59 ms 6748 KB Output is correct
81 Correct 57 ms 6768 KB Output is correct
82 Correct 50 ms 6776 KB Output is correct
83 Correct 63 ms 6760 KB Output is correct
84 Correct 55 ms 6592 KB Output is correct
85 Correct 59 ms 6648 KB Output is correct
86 Correct 60 ms 7000 KB Output is correct
87 Correct 57 ms 6780 KB Output is correct
88 Correct 64 ms 6732 KB Output is correct
89 Correct 64 ms 6688 KB Output is correct
90 Correct 68 ms 6744 KB Output is correct
91 Correct 61 ms 6492 KB Output is correct
92 Correct 70 ms 6748 KB Output is correct