oj.uz

Submission #783879

# Submission time Handle Problem Language Result Execution time Memory
783879 2023-07-15T11:42:05 Z VMaksimoski008 Mecho (IOI09_mecho) C++14
100 / 100
 152 ms 6876 KB 
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <unordered_map>
#include <unordered_set>
#include <ctime>
#include <cassert>
#include <complex>
#include <string>
#include <stack>
#include <cstring>
#include <chrono>
#include <random>
#include <numeric>
#include <bitset>
#include <array>
#include <functional>

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define debug(x) cout << #x << ": " << x << '\n'
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
#define each(x, v) for(auto &x : v)
#define mp make_pair

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using str = string;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;

void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

int n, s;
int dr[4] = {0, -1, 0, 1};
int dc[4] = {-1, 0, 1, 0};
char mat[800][800];
vector<pii> hives;
pii mecho, home;

int dist[800][800][2];
bool vis[800][800];

bool ok(int r, int c) {
    return (r >= 0 && r < n && c >= 0 && c < n && !vis[r][c] && mat[r][c] != 'T');
}

void hive_fill() {
    queue<pair<int, int> > q;
    for(pii &x : hives) {
        q.push(x);
        vis[x.first][x.second] = true;
    }

    while(!q.empty()) {
        int r = q.front().first;
        int c = q.front().second;
        q.pop();

        for(int i=0; i<4; i++) {
            int newR = r + dr[i];
            int newC = c + dc[i];
            if(!ok(newR, newC) || mat[newR][newC] == 'D') continue;
            vis[newR][newC] = true;
            dist[newR][newC][1] = dist[r][c][1] + 1;
            // if(mat[newR][newC] == 'G')
                q.push({ newR, newC });
        }
    }
}

int calcMinutes(int steps) {
    return steps / s;
}

bool check(int mid) {
    queue<pii> q;
    memset(vis, 0, sizeof(vis));

    q.push(mecho);
    vis[mecho.first][mecho.second] = true;
    while(!q.empty()) {
        int r = q.front().first;
        int c = q.front().second;
        q.pop();

        if(r == home.first && c == home.second)
            return true;

        for(int i=0; i<4; i++) {
            int newR = r + dr[i];
            int newC = c + dc[i];
            if(!ok(newR, newC)) continue;
            if(mid >= dist[newR][newC][1] && mat[newR][newC] != 'D') 
                continue;
            if(mid + calcMinutes(dist[r][c][0] + 1) >= dist[newR][newC][1] && mat[newR][newC] != 'D')
                continue;
            q.push({ newR, newC });
            vis[newR][newC] = true;
            dist[newR][newC][0] = dist[r][c][0] + 1;
        }
    }

    return false;
}

int32_t main() {
    setIO();

    cin >> n >> s;
    memset(dist, 0, sizeof(dist));
    memset(vis, 0, sizeof(vis));
    for(int i=0; i<n; i++) {
        for(int j=0; j<n; j++) {
            cin >> mat[i][j];
            if(mat[i][j] == 'H') hives.pb({i, j});
            else if(mat[i][j] == 'M') mecho = {i, j};
            else if(mat[i][j] == 'D') home = {i, j};
        }
    }

    hive_fill();

    int ans = -1;
    int l=0, r=dist[mecho.first][mecho.second][1]-1;
    while(l <= r) {
        int mid = (l + r) / 2;

        if(check(mid)) {
            ans = mid;
            l = mid + 1;
        } else {
            r = mid - 1;
        }
    }

    // for(int i=0; i<n; i++) {
    //     for(int j=0; j<n; j++) {
    //         cout << dist[i][j][1];
    //         if(j == n-1) cout << '\n';
    //         else cout << " ";
    //     }
    // }

    // cout << "-----------------\n";

    
    // for(int i=0; i<n; i++) {
    //     for(int j=0; j<n; j++) {
    //         cout << dist[i][j][0];
    //         if(j == n-1) cout << '\n';
    //         else cout << " ";
    //     }
    // }

    cout << ans << '\n';
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5844 KB Output is correct
2 Correct 2 ms 5844 KB Output is correct
3 Correct 2 ms 5844 KB Output is correct
4 Correct 2 ms 5884 KB Output is correct
5 Correct 2 ms 5844 KB Output is correct
6 Correct 2 ms 5844 KB Output is correct
7 Correct 97 ms 6808 KB Output is correct
8 Correct 2 ms 5972 KB Output is correct
9 Correct 3 ms 5844 KB Output is correct
10 Correct 3 ms 5972 KB Output is correct
11 Correct 2 ms 5972 KB Output is correct
12 Correct 3 ms 5972 KB Output is correct
13 Correct 2 ms 5972 KB Output is correct
14 Correct 3 ms 5972 KB Output is correct
15 Correct 2 ms 5972 KB Output is correct
16 Correct 2 ms 5972 KB Output is correct
17 Correct 2 ms 5972 KB Output is correct
18 Correct 2 ms 5972 KB Output is correct
19 Correct 2 ms 5972 KB Output is correct
20 Correct 2 ms 5972 KB Output is correct
21 Correct 2 ms 5972 KB Output is correct
22 Correct 2 ms 5972 KB Output is correct
23 Correct 2 ms 5972 KB Output is correct
24 Correct 3 ms 5972 KB Output is correct
25 Correct 4 ms 5972 KB Output is correct
26 Correct 2 ms 5972 KB Output is correct
27 Correct 3 ms 5972 KB Output is correct
28 Correct 3 ms 5972 KB Output is correct
29 Correct 4 ms 5972 KB Output is correct
30 Correct 3 ms 5972 KB Output is correct
31 Correct 3 ms 5972 KB Output is correct
32 Correct 2 ms 5972 KB Output is correct
33 Correct 5 ms 6228 KB Output is correct
34 Correct 5 ms 6228 KB Output is correct
35 Correct 20 ms 6236 KB Output is correct
36 Correct 6 ms 6280 KB Output is correct
37 Correct 6 ms 6152 KB Output is correct
38 Correct 27 ms 6168 KB Output is correct
39 Correct 6 ms 6228 KB Output is correct
40 Correct 6 ms 6316 KB Output is correct
41 Correct 37 ms 6228 KB Output is correct
42 Correct 7 ms 6356 KB Output is correct
43 Correct 7 ms 6352 KB Output is correct
44 Correct 42 ms 6356 KB Output is correct
45 Correct 8 ms 6356 KB Output is correct
46 Correct 8 ms 6356 KB Output is correct
47 Correct 61 ms 6356 KB Output is correct
48 Correct 12 ms 6356 KB Output is correct
49 Correct 10 ms 6356 KB Output is correct
50 Correct 58 ms 6432 KB Output is correct
51 Correct 10 ms 6356 KB Output is correct
52 Correct 11 ms 6372 KB Output is correct
53 Correct 72 ms 6476 KB Output is correct
54 Correct 18 ms 6488 KB Output is correct
55 Correct 12 ms 6516 KB Output is correct
56 Correct 83 ms 6508 KB Output is correct
57 Correct 13 ms 6480 KB Output is correct
58 Correct 14 ms 6500 KB Output is correct
59 Correct 92 ms 6536 KB Output is correct
60 Correct 14 ms 6484 KB Output is correct
61 Correct 14 ms 6484 KB Output is correct
62 Correct 109 ms 6576 KB Output is correct
63 Correct 90 ms 6568 KB Output is correct
64 Correct 152 ms 6576 KB Output is correct
65 Correct 151 ms 6576 KB Output is correct
66 Correct 108 ms 6572 KB Output is correct
67 Correct 98 ms 6572 KB Output is correct
68 Correct 41 ms 6612 KB Output is correct
69 Correct 36 ms 6604 KB Output is correct
70 Correct 35 ms 6612 KB Output is correct
71 Correct 28 ms 6592 KB Output is correct
72 Correct 28 ms 6608 KB Output is correct
73 Correct 35 ms 6776 KB Output is correct
74 Correct 56 ms 6876 KB Output is correct
75 Correct 56 ms 6848 KB Output is correct
76 Correct 58 ms 6848 KB Output is correct
77 Correct 62 ms 6876 KB Output is correct
78 Correct 68 ms 6836 KB Output is correct
79 Correct 48 ms 6808 KB Output is correct
80 Correct 58 ms 6836 KB Output is correct
81 Correct 65 ms 6836 KB Output is correct
82 Correct 54 ms 6740 KB Output is correct
83 Correct 73 ms 6804 KB Output is correct
84 Correct 60 ms 6788 KB Output is correct
85 Correct 61 ms 6740 KB Output is correct
86 Correct 72 ms 6740 KB Output is correct
87 Correct 63 ms 6792 KB Output is correct
88 Correct 73 ms 6740 KB Output is correct
89 Correct 71 ms 6744 KB Output is correct
90 Correct 79 ms 6740 KB Output is correct
91 Correct 75 ms 6740 KB Output is correct
92 Correct 84 ms 6756 KB Output is correct