oj.uz

Submission #196190

# Submission time Handle Problem Language Result Execution time Memory
196190 2020-01-17T03:18:22 Z tri Mecho (IOI09_mecho) C++14
100 / 100
 290 ms 7672 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;

#define pb push_back
#define f first
#define s second

const int MAXN = 1000;
const int INF = 1e9;

int unuse[MAXN][MAXN];
int reach[MAXN][MAXN];

const int dI[] = {-1, 0, 1, 0};
const int dJ[] = {0, -1, 0, 1};

int N, S;
pi st, goal;

bool reachGoal(int delay) {
    if (delay == -1) return true;
    for (int i = 0; i <= N + 1; i++) {
        for (int j = 0; j <= N + 1; j++) {
            reach[i][j] = INF;
        }
    }

    reach[st.f][st.s] = delay * S;
    queue<pi> q;
    q.push(st);

    while (q.size()) {
        pi cur = q.front();
        q.pop();

        if (reach[cur.f][cur.s] < unuse[cur.f][cur.s] * S) {
            for (int d = 0; d < 4; d++) {
                int nI = cur.f + dI[d];
                int nJ = cur.s + dJ[d];

                if (reach[nI][nJ] == INF) {
                    reach[nI][nJ] = reach[cur.f][cur.s] + 1;
                    q.push({nI, nJ});
                }
            }
        }
    }

    return reach[goal.f][goal.s] != INF;
}

int binSearch() {
    int low = -1;
    int high = 800 * 800;

    while (low != high) {
        int mid = (low + high + 1) / 2;

        if (reachGoal(mid)) {
            low = mid;
        } else {
            high = mid - 1;
        }
    }
    return low;
}

int main() {
    cin >> N >> S;

    for (int i = 0; i <= N + 1; i++) {
        for (int j = 0; j <= N + 1; j++) {
            unuse[i][j] = -1;
        }
    }

    for (int i = 0; i <= N + 1; i++) {
        unuse[0][i] = 0;
        unuse[N + 1][i] = 0;
        unuse[i][0] = 0;
        unuse[i][N + 1] = 0;
    }

    queue<pi> q;
    for (int i = 1; i <= N; i++) {
        string line;
        cin >> line;
        for (int j = 1; j <= N; j++) {
            char cur = line[j - 1];
            if (cur == 'T') {
                unuse[i][j] = 0;
            } else if (cur == 'H') {
                unuse[i][j] = 0;
                q.push({i, j});
            } else if (cur == 'M') {
                st = {i, j};
            } else if (cur == 'D') {
                goal = {i, j};
                unuse[i][j] = INF;
            } else {
                assert(cur == 'G');
            }
        }
    }

    while (!q.empty()) {
        pi cur = q.front();
        q.pop();

        for (int d = 0; d < 4; d++) {
            int nI = cur.f + dI[d];
            int nJ = cur.s + dJ[d];
            if (unuse[nI][nJ] == -1) {
                unuse[nI][nJ] = unuse[cur.f][cur.s] + 1;
                q.push({nI, nJ});
            }
        }
    }
    int ans = binSearch();
    cout << ans << endl;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 368 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 126 ms 7288 KB Output is correct
8 Correct 3 ms 504 KB Output is correct
9 Correct 2 ms 504 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 504 KB Output is correct
12 Correct 3 ms 888 KB Output is correct
13 Correct 3 ms 760 KB Output is correct
14 Correct 3 ms 888 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 3 ms 504 KB Output is correct
17 Correct 3 ms 504 KB Output is correct
18 Correct 2 ms 504 KB Output is correct
19 Correct 3 ms 504 KB Output is correct
20 Correct 3 ms 632 KB Output is correct
21 Correct 3 ms 632 KB Output is correct
22 Correct 2 ms 632 KB Output is correct
23 Correct 3 ms 760 KB Output is correct
24 Correct 3 ms 760 KB Output is correct
25 Correct 3 ms 760 KB Output is correct
26 Correct 3 ms 760 KB Output is correct
27 Correct 3 ms 888 KB Output is correct
28 Correct 3 ms 888 KB Output is correct
29 Correct 3 ms 888 KB Output is correct
30 Correct 3 ms 888 KB Output is correct
31 Correct 4 ms 888 KB Output is correct
32 Correct 4 ms 1016 KB Output is correct
33 Correct 16 ms 3192 KB Output is correct
34 Correct 15 ms 3192 KB Output is correct
35 Correct 34 ms 3252 KB Output is correct
36 Correct 19 ms 3624 KB Output is correct
37 Correct 20 ms 3576 KB Output is correct
38 Correct 53 ms 3768 KB Output is correct
39 Correct 26 ms 4088 KB Output is correct
40 Correct 24 ms 4088 KB Output is correct
41 Correct 68 ms 4088 KB Output is correct
42 Correct 24 ms 4512 KB Output is correct
43 Correct 29 ms 4544 KB Output is correct
44 Correct 66 ms 4512 KB Output is correct
45 Correct 34 ms 5020 KB Output is correct
46 Correct 36 ms 4984 KB Output is correct
47 Correct 103 ms 4984 KB Output is correct
48 Correct 38 ms 5368 KB Output is correct
49 Correct 61 ms 5500 KB Output is correct
50 Correct 101 ms 5468 KB Output is correct
51 Correct 41 ms 5880 KB Output is correct
52 Correct 43 ms 5864 KB Output is correct
53 Correct 130 ms 5976 KB Output is correct
54 Correct 49 ms 6392 KB Output is correct
55 Correct 53 ms 6264 KB Output is correct
56 Correct 153 ms 6392 KB Output is correct
57 Correct 54 ms 6756 KB Output is correct
58 Correct 58 ms 6844 KB Output is correct
59 Correct 175 ms 6908 KB Output is correct
60 Correct 62 ms 7288 KB Output is correct
61 Correct 68 ms 7416 KB Output is correct
62 Correct 201 ms 7288 KB Output is correct
63 Correct 154 ms 7288 KB Output is correct
64 Correct 290 ms 7416 KB Output is correct
65 Correct 223 ms 7308 KB Output is correct
66 Correct 186 ms 7288 KB Output is correct
67 Correct 181 ms 7372 KB Output is correct
68 Correct 106 ms 7408 KB Output is correct
69 Correct 103 ms 7340 KB Output is correct
70 Correct 105 ms 7288 KB Output is correct
71 Correct 69 ms 7292 KB Output is correct
72 Correct 69 ms 7208 KB Output is correct
73 Correct 73 ms 7544 KB Output is correct
74 Correct 95 ms 7628 KB Output is correct
75 Correct 111 ms 7604 KB Output is correct
76 Correct 103 ms 7648 KB Output is correct
77 Correct 106 ms 7672 KB Output is correct
78 Correct 119 ms 7416 KB Output is correct
79 Correct 104 ms 7544 KB Output is correct
80 Correct 118 ms 7608 KB Output is correct
81 Correct 107 ms 7504 KB Output is correct
82 Correct 100 ms 7540 KB Output is correct
83 Correct 120 ms 7584 KB Output is correct
84 Correct 107 ms 7416 KB Output is correct
85 Correct 113 ms 7480 KB Output is correct
86 Correct 117 ms 7568 KB Output is correct
87 Correct 131 ms 7516 KB Output is correct
88 Correct 140 ms 7548 KB Output is correct
89 Correct 137 ms 7544 KB Output is correct
90 Correct 126 ms 7516 KB Output is correct
91 Correct 119 ms 7432 KB Output is correct
92 Correct 133 ms 7452 KB Output is correct