oj.uz

Submission #542410

# Submission time Handle Problem Language Result Execution time Memory
542410 2022-03-26T13:29:14 Z ddy888 Mecho (IOI09_mecho) C++17
100 / 100
 221 ms 11772 KB 
#undef _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
void debug_out() {cerr<<endl;}
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {cerr<<" "<<to_string(H);debug_out(T...);}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:",debug_out(__VA_ARGS__)
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long 
#define pb push_back
#define fi first
#define si second
typedef pair<int,int> pi;
typedef tuple<int,int,int> ti;  
template<typename T> bool chmin(T &a, T b) {return (b < a) ? a = b, 1 : 0;}
template<typename T> bool chmax(T &a, T b) {return (b > a) ? a = b, 1 : 0;}
const int INF = 1e9;

int N, S;
char A[810][810];
int dist[810][810], rev[810][810];
int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};
queue<pi> q;
pi st;

bool inside(int x, int y) {return (x >= 1 && x <= N && y >= 1 && y <= N);}

bool good(int delta) {
    while (q.size()) q.pop();
    memset(rev, -1, sizeof rev);
    rev[st.fi][st.si] = 0;
    q.push(st);
    while (q.size()) {
        auto [x, y] = q.front(); q.pop();
        if (rev[x][y] / S + delta >= dist[x][y]) continue;
        if (A[x][y] == 'D') return 1;
        for (int i = 0; i < 4; ++i) {
            int nx = x + dx[i], ny = y + dy[i];
            if (A[nx][ny] == 'T') continue;
            if (!inside(nx, ny)) continue;
            if (rev[nx][ny] != -1) continue;
            rev[nx][ny] = rev[x][y] + 1;
            q.push({nx, ny});
        }
    }
    return 0;
}

signed main() {
    fast;
    cin >> N >> S;
    for (int i = 1; i <= N; ++i) {
        for (int j = 1; j <= N; ++j) {
            cin >> A[i][j];
            dist[i][j] = INF;
            if (A[i][j] == 'H') {
                q.push({i, j});
                dist[i][j] = 0;
            } else if (A[i][j] == 'M') st = pi(i, j);
        }
    }
    while (q.size()) {
        auto [x, y] = q.front(); q.pop();
        for (int i = 0; i < 4; ++i) {
            int nx = x + dx[i], ny = y + dy[i];
            if (A[nx][ny] == 'T' || A[nx][ny] == 'D') continue;
            if (!inside(nx, ny)) continue;
            if (dist[nx][ny] != INF) continue;
            dist[nx][ny] = dist[x][y] + 1;
            q.push({nx, ny});
        }
    }
    if (!good(0)) return cout << -1, 0;
    int lo = -1, hi = 1e9 + 1;
    while (lo + 1 < hi) {
        int mid = (lo + hi) / 2;
        if (good(mid)) lo = mid;
        else hi = mid;
    }
    cout << lo;
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5460 KB Output is correct
2 Correct 7 ms 5460 KB Output is correct
3 Correct 7 ms 5460 KB Output is correct
4 Correct 7 ms 5496 KB Output is correct
5 Correct 7 ms 5504 KB Output is correct
6 Correct 7 ms 5516 KB Output is correct
7 Correct 117 ms 11392 KB Output is correct
8 Correct 2 ms 5460 KB Output is correct
9 Correct 8 ms 5460 KB Output is correct
10 Correct 7 ms 5540 KB Output is correct
11 Correct 8 ms 5460 KB Output is correct
12 Correct 9 ms 5784 KB Output is correct
13 Correct 7 ms 5716 KB Output is correct
14 Correct 3 ms 5784 KB Output is correct
15 Correct 7 ms 5564 KB Output is correct
16 Correct 8 ms 5460 KB Output is correct
17 Correct 8 ms 5588 KB Output is correct
18 Correct 7 ms 5588 KB Output is correct
19 Correct 6 ms 5588 KB Output is correct
20 Correct 7 ms 5588 KB Output is correct
21 Correct 7 ms 5588 KB Output is correct
22 Correct 7 ms 5588 KB Output is correct
23 Correct 7 ms 5716 KB Output is correct
24 Correct 7 ms 5716 KB Output is correct
25 Correct 8 ms 5784 KB Output is correct
26 Correct 7 ms 5716 KB Output is correct
27 Correct 8 ms 5716 KB Output is correct
28 Correct 7 ms 5716 KB Output is correct
29 Correct 7 ms 5844 KB Output is correct
30 Correct 7 ms 5844 KB Output is correct
31 Correct 13 ms 5872 KB Output is correct
32 Correct 8 ms 5788 KB Output is correct
33 Correct 15 ms 7892 KB Output is correct
34 Correct 15 ms 7972 KB Output is correct
35 Correct 29 ms 7892 KB Output is correct
36 Correct 11 ms 8276 KB Output is correct
37 Correct 12 ms 8312 KB Output is correct
38 Correct 31 ms 8276 KB Output is correct
39 Correct 14 ms 8668 KB Output is correct
40 Correct 11 ms 8680 KB Output is correct
41 Correct 54 ms 8672 KB Output is correct
42 Correct 13 ms 9032 KB Output is correct
43 Correct 13 ms 8916 KB Output is correct
44 Correct 74 ms 8916 KB Output is correct
45 Correct 16 ms 9392 KB Output is correct
46 Correct 19 ms 9300 KB Output is correct
47 Correct 69 ms 9392 KB Output is correct
48 Correct 16 ms 9720 KB Output is correct
49 Correct 16 ms 9744 KB Output is correct
50 Correct 71 ms 9748 KB Output is correct
51 Correct 19 ms 10060 KB Output is correct
52 Correct 19 ms 10016 KB Output is correct
53 Correct 106 ms 10232 KB Output is correct
54 Correct 19 ms 10460 KB Output is correct
55 Correct 23 ms 10364 KB Output is correct
56 Correct 95 ms 10460 KB Output is correct
57 Correct 21 ms 10776 KB Output is correct
58 Correct 19 ms 10808 KB Output is correct
59 Correct 138 ms 10804 KB Output is correct
60 Correct 25 ms 11092 KB Output is correct
61 Correct 22 ms 11164 KB Output is correct
62 Correct 128 ms 11176 KB Output is correct
63 Correct 129 ms 11160 KB Output is correct
64 Correct 221 ms 11168 KB Output is correct
65 Correct 200 ms 11172 KB Output is correct
66 Correct 134 ms 11048 KB Output is correct
67 Correct 39 ms 11264 KB Output is correct
68 Correct 62 ms 11220 KB Output is correct
69 Correct 62 ms 11216 KB Output is correct
70 Correct 44 ms 11220 KB Output is correct
71 Correct 43 ms 11208 KB Output is correct
72 Correct 40 ms 11220 KB Output is correct
73 Correct 57 ms 11608 KB Output is correct
74 Correct 78 ms 11664 KB Output is correct
75 Correct 103 ms 11720 KB Output is correct
76 Correct 75 ms 11720 KB Output is correct
77 Correct 85 ms 11716 KB Output is correct
78 Correct 37 ms 11660 KB Output is correct
79 Correct 69 ms 11772 KB Output is correct
80 Correct 68 ms 11624 KB Output is correct
81 Correct 84 ms 11668 KB Output is correct
82 Correct 95 ms 11596 KB Output is correct
83 Correct 92 ms 11584 KB Output is correct
84 Correct 88 ms 11452 KB Output is correct
85 Correct 87 ms 11584 KB Output is correct
86 Correct 113 ms 11580 KB Output is correct
87 Correct 89 ms 11484 KB Output is correct
88 Correct 96 ms 11480 KB Output is correct
89 Correct 98 ms 11476 KB Output is correct
90 Correct 102 ms 11484 KB Output is correct
91 Correct 95 ms 11468 KB Output is correct
92 Correct 92 ms 11488 KB Output is correct