oj.uz

Submission #597582

# Submission time Handle Problem Language Result Execution time Memory
597582 2022-07-16T10:49:36 Z BhavayGoyal Mecho (IOI09_mecho) C++14
100 / 100
 193 ms 8140 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ld long double
#define ar array
#define vi vector<int>
#define vii vector<vector<int>>
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second
#define endl "\n"

const int MOD = 1e9+7;
const int inf = 1e9;
const ll linf = 1e18;

// -------------------------------------------------- Main Code --------------------------------------------------

const int N = 800;
int n, s;
int arr[N][N], beesDis[N][N], bearDis[N][N];
queue<pii> bees;
pii st, en;

int di[4] = {0, 0, 1, -1}, dj[4] = {1, -1, 0, 0};

bool isVal(int i, int j) {
    return (i >= 0 && j >= 0 && i < n && j < n && arr[i][j]);
}

void fillBees() {
    while (!bees.empty()) {
        auto f = bees.front(); bees.pop();
        for (int i = 0; i < 4; i++) {
            int ni = f.f+di[i], nj = f.s+dj[i];
            if (isVal(ni, nj) && beesDis[ni][nj] == -1) {
                beesDis[ni][nj] = beesDis[f.f][f.s]+1;
                bees.push({ni, nj});
            }
        }
    }
}

bool isPoss(int i, int j, int dis, int initTime) {
    return ((dis/s)+initTime < beesDis[i][j]);
}

bool isFiss(int initTime) {
    if (beesDis[st.f][st.s] <= initTime) return false;
    memset(bearDis, -1, sizeof bearDis);
    queue<pii> bear; bear.push({st.f, st.s});
    bearDis[st.f][st.s] = 0;
    while (!bear.empty()) {
        auto f = bear.front(); bear.pop();
        for (int i = 0; i < 4; i++) {
            int ni = f.f+di[i], nj = f.s+dj[i];
            if (isVal(ni, nj) && bearDis[ni][nj] == -1 && isPoss(ni, nj, bearDis[f.f][f.s]+1, initTime)) {
                bearDis[ni][nj] = bearDis[f.f][f.s]+1;
                bear.push({ni, nj});
            }
        }
    }

    for (int i = 0; i < 4; i++) {
        int ni = en.f+di[i], nj = en.s+dj[i];
        if (isVal(ni, nj) && bearDis[ni][nj] != -1) return true;
    }

    return false;
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> s;
    memset(beesDis, -1, sizeof beesDis);
    memset(arr, 0, sizeof arr);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            char x; cin >> x;
            if (x == 'M') st = {i, j};
            if (x == 'D') en = {i, j};
            if (x == 'H') {
                bees.push({i, j});
                beesDis[i][j] = 0;
            }
            if (x == 'G' || x == 'M') arr[i][j] = 1;
        }
    }

    fillBees();

    int i = 0, j = n*n, ans = inf;
    while (i <= j) {
        int mid = (i+j)/2;
        if (isFiss(mid)) ans = mid, i = mid+1;
        else j = mid-1;
    }
    cout << (ans==inf?-1:ans) << endl;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7764 KB Output is correct
2 Correct 4 ms 7764 KB Output is correct
3 Correct 3 ms 7764 KB Output is correct
4 Correct 4 ms 7764 KB Output is correct
5 Correct 3 ms 7764 KB Output is correct
6 Correct 4 ms 7764 KB Output is correct
7 Correct 74 ms 7892 KB Output is correct
8 Correct 3 ms 7764 KB Output is correct
9 Correct 4 ms 7728 KB Output is correct
10 Correct 4 ms 7764 KB Output is correct
11 Correct 3 ms 7764 KB Output is correct
12 Correct 5 ms 7764 KB Output is correct
13 Correct 5 ms 7764 KB Output is correct
14 Correct 4 ms 7764 KB Output is correct
15 Correct 4 ms 7764 KB Output is correct
16 Correct 4 ms 7764 KB Output is correct
17 Correct 3 ms 7764 KB Output is correct
18 Correct 4 ms 7764 KB Output is correct
19 Correct 4 ms 7764 KB Output is correct
20 Correct 3 ms 7764 KB Output is correct
21 Correct 4 ms 7764 KB Output is correct
22 Correct 4 ms 7764 KB Output is correct
23 Correct 4 ms 7764 KB Output is correct
24 Correct 4 ms 7764 KB Output is correct
25 Correct 4 ms 7764 KB Output is correct
26 Correct 4 ms 7764 KB Output is correct
27 Correct 4 ms 7764 KB Output is correct
28 Correct 4 ms 7764 KB Output is correct
29 Correct 4 ms 7764 KB Output is correct
30 Correct 4 ms 7764 KB Output is correct
31 Correct 4 ms 7764 KB Output is correct
32 Correct 5 ms 7764 KB Output is correct
33 Correct 8 ms 7764 KB Output is correct
34 Correct 8 ms 7764 KB Output is correct
35 Correct 23 ms 7840 KB Output is correct
36 Correct 8 ms 7764 KB Output is correct
37 Correct 9 ms 7768 KB Output is correct
38 Correct 27 ms 7804 KB Output is correct
39 Correct 10 ms 7828 KB Output is correct
40 Correct 11 ms 7764 KB Output is correct
41 Correct 38 ms 7776 KB Output is correct
42 Correct 11 ms 7764 KB Output is correct
43 Correct 12 ms 7768 KB Output is correct
44 Correct 49 ms 7828 KB Output is correct
45 Correct 14 ms 7764 KB Output is correct
46 Correct 13 ms 7764 KB Output is correct
47 Correct 54 ms 7820 KB Output is correct
48 Correct 14 ms 7768 KB Output is correct
49 Correct 14 ms 7764 KB Output is correct
50 Correct 59 ms 7820 KB Output is correct
51 Correct 15 ms 7764 KB Output is correct
52 Correct 22 ms 7764 KB Output is correct
53 Correct 81 ms 7764 KB Output is correct
54 Correct 22 ms 7832 KB Output is correct
55 Correct 20 ms 7764 KB Output is correct
56 Correct 98 ms 7820 KB Output is correct
57 Correct 19 ms 7840 KB Output is correct
58 Correct 22 ms 7764 KB Output is correct
59 Correct 114 ms 7824 KB Output is correct
60 Correct 22 ms 7764 KB Output is correct
61 Correct 24 ms 7812 KB Output is correct
62 Correct 120 ms 7884 KB Output is correct
63 Correct 107 ms 7748 KB Output is correct
64 Correct 193 ms 7752 KB Output is correct
65 Correct 155 ms 7752 KB Output is correct
66 Correct 116 ms 7764 KB Output is correct
67 Correct 113 ms 7824 KB Output is correct
68 Correct 54 ms 7776 KB Output is correct
69 Correct 61 ms 7848 KB Output is correct
70 Correct 38 ms 7756 KB Output is correct
71 Correct 43 ms 7768 KB Output is correct
72 Correct 33 ms 7784 KB Output is correct
73 Correct 34 ms 8044 KB Output is correct
74 Correct 54 ms 8032 KB Output is correct
75 Correct 75 ms 8140 KB Output is correct
76 Correct 57 ms 8104 KB Output is correct
77 Correct 57 ms 8036 KB Output is correct
78 Correct 67 ms 8024 KB Output is correct
79 Correct 46 ms 8020 KB Output is correct
80 Correct 62 ms 8016 KB Output is correct
81 Correct 73 ms 8028 KB Output is correct
82 Correct 54 ms 8032 KB Output is correct
83 Correct 69 ms 8012 KB Output is correct
84 Correct 63 ms 8032 KB Output is correct
85 Correct 89 ms 8096 KB Output is correct
86 Correct 67 ms 8032 KB Output is correct
87 Correct 72 ms 8028 KB Output is correct
88 Correct 73 ms 7980 KB Output is correct
89 Correct 79 ms 7892 KB Output is correct
90 Correct 77 ms 7888 KB Output is correct
91 Correct 74 ms 7980 KB Output is correct
92 Correct 76 ms 7952 KB Output is correct