Submission #839372

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
839372	2023-08-29T22:20:29 Z	ArashJafariyan	Mecho (IOI09_mecho)	C++17	41 / 100	167 ms	6480 KB

mecho

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;

#define F first
#define S second
#define pb push_back
#define size(a) (int) a.size()
#define all(a) a.begin(), a.end()

const int maxn = 800 + 4, inf = 1e9;

int n, s, mx, my, dx, dy, d[maxn][maxn], save[maxn][maxn];
bitset<maxn> vis[maxn];
string a[maxn];
queue<array<int, 2>> q;

void rest() {
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            vis[i][j] = 0;
            d[i][j] = inf;
        }
    }
    return;
}

bool check0(int x, int y) {
    bool ret = (0 <= x && x < n);
    ret &= (0 <= y && y < n);
    if (ret) {
        ret &= !vis[x][y];
        ret &= ((a[x][y] == 'G' || a[x][y] == 'M') || a[x][y] == 'D');
    }
    return ret;
}

void upd0(int x, int y) { 
    int dis = d[x][y] + 1;

    if (check0(x - 1, y)) {
        vis[x - 1][y] = 1;
        d[x - 1][y] = dis;
        q.push({x - 1, y});
    }
    if (check0(x + 1, y)) {
        vis[x + 1][y] = 1;
        d[x + 1][y] = dis;
        q.push({x + 1, y});
    }
    if (check0(x, y - 1)) {
        vis[x][y - 1] = 1;
        d[x][y - 1] = dis;
        q.push({x, y - 1});
    }
    if (check0(x, y + 1)) {
        vis[x][y + 1] = 1;
        d[x][y + 1] = dis;
        q.push({x, y + 1});
    }
}

bool check1(int x, int y, int dis, int k) {
    bool ret = (0 <= x && x < n);
    ret &= (0 <= y && y < n);
    if (ret) {
        ret &= !vis[x][y];
        ret &= (a[x][y] == 'G' || a[x][y] == 'D');
        ret &= (dis + s - 1) / s <= save[x][y] - k;
    }
    return ret;
}

void upd1(int x, int y, int k) {
    int dis = d[x][y] + 1;
    
    if (check1(x - 1, y, dis, k)) {
        vis[x - 1][y] = 1;
        d[x - 1][y] = dis;
        q.push({x - 1, y});
    }
    if (check1(x + 1, y, dis, k)) {
        vis[x + 1][y] = 1;
        d[x + 1][y] = dis;
        q.push({x + 1, y});
    }
    if (check1(x, y - 1, dis, k)) {
        vis[x][y - 1] = 1;
        d[x][y - 1] = dis;
        q.push({x, y - 1});
    }
    if (check1(x, y + 1, dis, k)) {
        vis[x][y + 1] = 1;
        d[x][y + 1] = dis;
        q.push({x, y + 1});
    }
}

bool bfs(int k) {
    rest();

    d[mx][my] = 0;
    vis[mx][my] = 1;
    q.push({mx, my});
    while (!q.empty()) {
        array<int, 2> v = q.front();
        q.pop();
        upd1(v[0], v[1], k);
    }
    
    return d[dx][dy] != inf;
}

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

    cin >> n >> s;
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }

    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            if (a[i][j] == 'H') {
                q.push({i, j});
                vis[i][j] = 1;
            }
        }
    }

    while (!q.empty()) {
        array<int, 2> v = q.front();
        q.pop();
        upd0(v[0], v[1]);
    }

    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            if (a[i][j] == 'M') {
                mx = i;
                my = j;
            }
            if (a[i][j] == 'D') {
                dx = i;
                dy = j;
            }
            save[i][j] = d[i][j];
        }
    }

    int l, r;
    l = -1;
    r = save[mx][my];

    while (r - l > 1) {
        int m = (l + r) >> 1;
        if (bfs(m)) {
            l = m;
        }
        else {
            r = m;
        }
    }
    cout << l << '\n';

    return 0;
}

Subtask #1

41.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	340 KB	Output isn't correct
2	Incorrect	1 ms	340 KB	Output isn't correct
3	Incorrect	0 ms	340 KB	Output isn't correct
4	Incorrect	0 ms	340 KB	Output isn't correct
5	Correct	0 ms	340 KB	Output is correct
6	Incorrect	1 ms	340 KB	Output isn't correct
7	Incorrect	86 ms	6276 KB	Output isn't correct
8	Incorrect	1 ms	340 KB	Output isn't correct
9	Correct	0 ms	340 KB	Output is correct
10	Correct	0 ms	340 KB	Output is correct
11	Correct	0 ms	340 KB	Output is correct
12	Incorrect	0 ms	724 KB	Output isn't correct
13	Correct	1 ms	596 KB	Output is correct
14	Correct	1 ms	724 KB	Output is correct
15	Incorrect	0 ms	592 KB	Output isn't correct
16	Correct	1 ms	468 KB	Output is correct
17	Incorrect	1 ms	468 KB	Output isn't correct
18	Correct	0 ms	468 KB	Output is correct
19	Incorrect	0 ms	468 KB	Output isn't correct
20	Correct	1 ms	468 KB	Output is correct
21	Incorrect	0 ms	596 KB	Output isn't correct
22	Correct	0 ms	596 KB	Output is correct
23	Incorrect	1 ms	596 KB	Output isn't correct
24	Correct	1 ms	596 KB	Output is correct
25	Incorrect	1 ms	724 KB	Output isn't correct
26	Correct	1 ms	724 KB	Output is correct
27	Incorrect	1 ms	724 KB	Output isn't correct
28	Correct	1 ms	724 KB	Output is correct
29	Incorrect	1 ms	724 KB	Output isn't correct
30	Correct	1 ms	724 KB	Output is correct
31	Incorrect	1 ms	724 KB	Output isn't correct
32	Correct	1 ms	724 KB	Output is correct
33	Incorrect	7 ms	2644 KB	Output isn't correct
34	Correct	8 ms	2644 KB	Output is correct
35	Correct	22 ms	2644 KB	Output is correct
36	Incorrect	10 ms	3028 KB	Output isn't correct
37	Correct	10 ms	3028 KB	Output is correct
38	Correct	33 ms	3028 KB	Output is correct
39	Incorrect	12 ms	3412 KB	Output isn't correct
40	Correct	12 ms	3412 KB	Output is correct
41	Correct	39 ms	3412 KB	Output is correct
42	Incorrect	14 ms	3796 KB	Output isn't correct
43	Correct	15 ms	3796 KB	Output is correct
44	Correct	48 ms	3796 KB	Output is correct
45	Incorrect	18 ms	4180 KB	Output isn't correct
46	Correct	18 ms	4180 KB	Output is correct
47	Correct	58 ms	4172 KB	Output is correct
48	Incorrect	21 ms	4564 KB	Output isn't correct
49	Correct	22 ms	4564 KB	Output is correct
50	Correct	69 ms	4564 KB	Output is correct
51	Incorrect	24 ms	4948 KB	Output isn't correct
52	Correct	25 ms	4948 KB	Output is correct
53	Correct	82 ms	4948 KB	Output is correct
54	Incorrect	27 ms	5332 KB	Output isn't correct
55	Correct	29 ms	5332 KB	Output is correct
56	Correct	99 ms	5332 KB	Output is correct
57	Incorrect	36 ms	5716 KB	Output isn't correct
58	Correct	33 ms	5716 KB	Output is correct
59	Correct	111 ms	5740 KB	Output is correct
60	Incorrect	37 ms	6124 KB	Output isn't correct
61	Correct	38 ms	6100 KB	Output is correct
62	Correct	138 ms	6124 KB	Output is correct
63	Correct	116 ms	6092 KB	Output is correct
64	Correct	156 ms	6124 KB	Output is correct
65	Correct	167 ms	6220 KB	Output is correct
66	Incorrect	122 ms	6128 KB	Output isn't correct
67	Correct	111 ms	6100 KB	Output is correct
68	Correct	46 ms	6100 KB	Output is correct
69	Correct	42 ms	6100 KB	Output is correct
70	Correct	38 ms	6064 KB	Output is correct
71	Correct	33 ms	6208 KB	Output is correct
72	Correct	37 ms	6204 KB	Output is correct
73	Correct	36 ms	6356 KB	Output is correct
74	Correct	67 ms	6356 KB	Output is correct
75	Correct	65 ms	6356 KB	Output is correct
76	Correct	74 ms	6476 KB	Output is correct
77	Correct	72 ms	6356 KB	Output is correct
78	Correct	77 ms	6480 KB	Output is correct
79	Correct	62 ms	6356 KB	Output is correct
80	Correct	72 ms	6436 KB	Output is correct
81	Correct	71 ms	6356 KB	Output is correct
82	Correct	65 ms	6356 KB	Output is correct
83	Correct	88 ms	6220 KB	Output is correct
84	Correct	72 ms	6228 KB	Output is correct
85	Correct	73 ms	6228 KB	Output is correct
86	Correct	86 ms	6356 KB	Output is correct
87	Correct	79 ms	6356 KB	Output is correct
88	Correct	93 ms	6288 KB	Output is correct
89	Correct	86 ms	6192 KB	Output is correct
90	Correct	101 ms	6288 KB	Output is correct
91	Correct	94 ms	6288 KB	Output is correct
92	Correct	93 ms	6228 KB	Output is correct