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Submission #988363

# Submission time Handle Problem Language Result Execution time Memory
988363 2024-05-24T14:39:08 Z steveonalex Mecho (IOI09_mecho) C++17
100 / 100
 201 ms 7856 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};

const int N = 900;
const int INF = 1e9 + 69;
int n, s;
bitset<N> grid[N];
int dis1[N][N], dis2[N][N];

int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n >> s;
    vector<string> field(n);
    for(int i = 0; i<n; ++i) cin >> field[i];

    for(int i = 0; i<=n+1; ++i) grid[i][0] = grid[0][i] = grid[i][n+1] = grid[n+1][i] = 1;
    for(int i = 0; i<n; ++i) for(int j = 0 ;j<n; ++j) if (field[i][j] == 'T' || field[i][j] == 'D'){
        grid[i+1][j+1] = 1;
    }

    for(int i = 0; i<=n+1; ++i) for(int j = 0; j<=n+1; ++j) dis1[i][j] = INF;

    deque<pair<int, int>> q;
    for(int i = 0; i<n; ++i) for(int j = 0; j<n; ++j) if (field[i][j] == 'H') {
        q.push_back({i + 1, j+1});
        dis1[i+1][j+1] = 0;
    }

    while(q.size()){
        pair<int, int> u = q.front(); q.pop_front();

        for(int dir = 0; dir < 4; ++dir){
            pair<int, int> v = {u.first + dx[dir], u.second + dy[dir]};
            if (!grid[v.first][v.second] && minimize(dis1[v.first][v.second], dis1[u.first][u.second] + 1)){
                q.push_back(v);
            }
        }
    }

    pair<int, int> S, E;
    for(int i = 0; i<n; ++i) for(int j = 0; j<n; ++j){
        if (field[i][j] == 'D') E = {i+1, j+1};
        if (field[i][j] == 'M') S = {i+1, j+1};
    }

    grid[E.first][E.second] = 0;

    if (dis1[S.first][S.second] == INF) exit(1);
    ll l = -1, r = dis1[S.first][S.second] * s - 1;
    while(l < r){
        ll mid = (l + r + 1) >> 1;
        for(int i = 0; i<=n+1; ++i) for(int j = 0; j<=n+1; ++j) dis2[i][j] = INF;

        dis2[S.first][S.second] = mid;

        deque<pair<int, int>> q; q.push_back(S);
        while(q.size()){
            pair<int, int> u = q.front(); q.pop_front();

            int cur = dis2[u.first][u.second];

            for(int dir = 0; dir < 4; ++dir){
                pair<int, int> v = {u.first + dx[dir], u.second + dy[dir]};
                if (!grid[v.first][v.second] && dis1[v.first][v.second] > (cur + 1) / s && minimize(dis2[v.first][v.second], cur + 1)){
                    q.push_back(v);
                }
            }
        }
        if (dis2[E.first][E.second] == INF) r = mid - 1;
        else l = mid;
    }

    if (l >= 0) l /= s;

    cout << l << "\n";

    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2520 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2392 KB Output is correct
7 Correct 104 ms 7668 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 2 ms 2396 KB Output is correct
12 Correct 2 ms 4700 KB Output is correct
13 Correct 3 ms 4700 KB Output is correct
14 Correct 2 ms 4700 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2392 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 KB Output is correct
20 Correct 1 ms 2392 KB Output is correct
21 Correct 1 ms 2652 KB Output is correct
22 Correct 1 ms 2652 KB Output is correct
23 Correct 1 ms 4700 KB Output is correct
24 Correct 1 ms 4700 KB Output is correct
25 Correct 2 ms 4700 KB Output is correct
26 Correct 1 ms 4700 KB Output is correct
27 Correct 1 ms 4696 KB Output is correct
28 Correct 2 ms 4696 KB Output is correct
29 Correct 1 ms 4700 KB Output is correct
30 Correct 2 ms 4700 KB Output is correct
31 Correct 1 ms 4700 KB Output is correct
32 Correct 2 ms 4908 KB Output is correct
33 Correct 4 ms 6744 KB Output is correct
34 Correct 5 ms 6744 KB Output is correct
35 Correct 32 ms 6748 KB Output is correct
36 Correct 5 ms 7004 KB Output is correct
37 Correct 6 ms 7004 KB Output is correct
38 Correct 40 ms 7004 KB Output is correct
39 Correct 6 ms 7076 KB Output is correct
40 Correct 7 ms 7000 KB Output is correct
41 Correct 54 ms 7004 KB Output is correct
42 Correct 8 ms 7004 KB Output is correct
43 Correct 11 ms 7000 KB Output is correct
44 Correct 64 ms 7004 KB Output is correct
45 Correct 8 ms 7004 KB Output is correct
46 Correct 10 ms 7000 KB Output is correct
47 Correct 76 ms 7004 KB Output is correct
48 Correct 10 ms 7260 KB Output is correct
49 Correct 12 ms 7260 KB Output is correct
50 Correct 93 ms 7260 KB Output is correct
51 Correct 11 ms 7260 KB Output is correct
52 Correct 14 ms 7256 KB Output is correct
53 Correct 113 ms 7260 KB Output is correct
54 Correct 13 ms 7512 KB Output is correct
55 Correct 15 ms 7260 KB Output is correct
56 Correct 144 ms 7508 KB Output is correct
57 Correct 15 ms 7256 KB Output is correct
58 Correct 17 ms 7256 KB Output is correct
59 Correct 153 ms 7500 KB Output is correct
60 Correct 16 ms 7512 KB Output is correct
61 Correct 20 ms 7516 KB Output is correct
62 Correct 182 ms 7516 KB Output is correct
63 Correct 79 ms 7516 KB Output is correct
64 Correct 201 ms 7516 KB Output is correct
65 Correct 153 ms 7564 KB Output is correct
66 Correct 92 ms 7512 KB Output is correct
67 Correct 91 ms 7768 KB Output is correct
68 Correct 51 ms 7512 KB Output is correct
69 Correct 49 ms 7516 KB Output is correct
70 Correct 40 ms 7440 KB Output is correct
71 Correct 31 ms 7504 KB Output is correct
72 Correct 27 ms 7516 KB Output is correct
73 Correct 45 ms 7772 KB Output is correct
74 Correct 87 ms 7856 KB Output is correct
75 Correct 67 ms 7768 KB Output is correct
76 Correct 61 ms 7832 KB Output is correct
77 Correct 70 ms 7844 KB Output is correct
78 Correct 85 ms 7816 KB Output is correct
79 Correct 79 ms 7768 KB Output is correct
80 Correct 66 ms 7812 KB Output is correct
81 Correct 74 ms 7772 KB Output is correct
82 Correct 65 ms 7772 KB Output is correct
83 Correct 85 ms 7772 KB Output is correct
84 Correct 105 ms 7772 KB Output is correct
85 Correct 84 ms 7772 KB Output is correct
86 Correct 87 ms 7768 KB Output is correct
87 Correct 90 ms 7772 KB Output is correct
88 Correct 93 ms 7720 KB Output is correct
89 Correct 122 ms 7720 KB Output is correct
90 Correct 104 ms 7716 KB Output is correct
91 Correct 108 ms 7512 KB Output is correct
92 Correct 102 ms 7512 KB Output is correct