Submission #145922

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
145922	2019-08-21T11:23:02 Z	popovicirobert	Mecho (IOI09_mecho)	C++14	100 / 100	291 ms	7000 KB

mecho

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long


#if 0
const int MOD = ;

inline int lgput(int a, int b) {
    int ans = 1;
    while(b > 0) {
        if(b & 1) ans = (1LL * ans * a) % MOD;
        b >>= 1;
        a = (1LL * a * a) % MOD;
    }
    return ans;
}

inline void mod(int &x) {
    if(x >= MOD)
        x -= MOD;
}

inline void add(int &x, int y) {
    x += y;
    mod(x);
}

inline void sub(int &x, int y) {
    x += MOD - y;
    mod(x);
}

inline void mul(int &x, int y) {
    x = (1LL * x * y) % MOD;
}

inline int inv(int x) {
    return lgput(x, MOD - 2);
}
#endif

#if 0
int fact[], invfact[];

inline void prec(int n) {
    fact[0] = 1;
    for(int i = 1; i <= n; i++) {
        fact[i] = (1LL * fact[i - 1] * i) % MOD;
    }
    invfact[n] = lgput(fact[n], MOD - 2);
    for(int i = n - 1; i >= 0; i--) {
        invfact[i] = (1LL * invfact[i + 1] * (i + 1)) % MOD;
    }
}

inline int comb(int n, int k) {
    if(n < k) return 0;
    return (1LL * fact[n] * (1LL * invfact[k] * invfact[n - k] % MOD)) % MOD;
}
#endif

using namespace std;

const int INF = 1e9;
const int MAXN = 800;

char mat[MAXN + 1][MAXN + 1];
int dl[] = {-1, 0, 1, 0}, dc[] = {0, -1, 0, 1}, n;

bool in(int l, int c) {
    return l > 0 && c > 0 && l <= n && c <= n;
}

int main() {
#if 0
    ifstream cin("A.in");
    ofstream cout("A.out");
#endif
    int i, j, s;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    cin >> n >> s;
    int lm, cm, ld, cd;
    for(i = 1; i <= n; i++) {
        cin >> mat[i] + 1;
        for(j = 1; j <= n; j++) {
            if(mat[i][j] == 'M') {
                lm = i, cm = j;
            }
            if(mat[i][j] == 'D') {
                ld = i, cd = j;
            }
        }
    }

    auto bfs = [&](vector < vector <int> > &dst, char ch) -> void {
        queue < pair <int, int> > Q;
        int i, j;
        for(i = 1; i <= n; i++) {
            for(j = 1; j <= n; j++) {
                dst[i][j] = INF;
                if(mat[i][j] == ch) {
                    Q.push({i, j});
                    dst[i][j] = 0;
                }
            }
        }
        while(Q.size()) {
            auto cur = Q.front();
            Q.pop();
            for(int i = 0; i < 4; i++) {
                int l = cur.first + dl[i], c = cur.second + dc[i];
                if(in(l, c) && dst[l][c] == INF && (mat[l][c] == 'G' || mat[l][c] == 'M')) {
                    dst[l][c] = dst[cur.first][cur.second] + 1;
                    Q.push({l, c});
                }
            }
        }
    };

    vector < vector <int> > H(n + 1, vector <int>(n + 1));
    vector < vector <int> > M(n + 1, vector <int>(n + 1));
    bfs(H, 'H');

    auto check = [&](int lim) -> bool {
        int i, j;
        for(i = 1; i <= n; i++) {
            for(j = 1; j <= n; j++) {
                M[i][j] = INF;
            }
        }
        if(lim >= H[lm][cm]) {
            return 0;
        }
        queue < pair <int, int> > Q; Q.push({lm, cm});
        M[lm][cm] = 0;
        while(Q.size()) {
            auto cur = Q.front();
            Q.pop();
            for(int i = 0; i < 4; i++) {
                int l = cur.first + dl[i], c = cur.second + dc[i];
                int d = (M[cur.first][cur.second] + 1) / s + lim;
                if(in(l, c) && M[l][c] == INF && d < H[l][c] && (mat[l][c] == 'G' || mat[l][c] == 'D')) {
                    Q.push({l, c});
                    M[l][c] = M[cur.first][cur.second] + 1;
                }
            }
        }
        return M[ld][cd] != INF;
    };

    int res = 0;
    for(int step = 1 << 19; step; step >>= 1) {
        if(check(res + step)) {
            res += step;
        }
    }
    cout << (check(res) ? res : -1);

    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:88:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         cin >> mat[i] + 1;
                ~~~~~~~^~~
mecho.cpp:152:24: warning: 'cd' may be used uninitialized in this function [-Wmaybe-uninitialized]
         return M[ld][cd] != INF;
                        ^
mecho.cpp:152:20: warning: 'ld' may be used uninitialized in this function [-Wmaybe-uninitialized]
         return M[ld][cd] != INF;
                    ^

Subtask #1

100.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 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	132 ms	6904 KB	Output is correct
8	Correct	3 ms	376 KB	Output is correct
9	Correct	2 ms	376 KB	Output is correct
10	Correct	2 ms	376 KB	Output is correct
11	Correct	2 ms	376 KB	Output is correct
12	Correct	2 ms	376 KB	Output is correct
13	Correct	2 ms	376 KB	Output is correct
14	Correct	2 ms	376 KB	Output is correct
15	Correct	2 ms	376 KB	Output is correct
16	Correct	2 ms	376 KB	Output is correct
17	Correct	2 ms	376 KB	Output is correct
18	Correct	2 ms	380 KB	Output is correct
19	Correct	2 ms	376 KB	Output is correct
20	Correct	2 ms	376 KB	Output is correct
21	Correct	2 ms	376 KB	Output is correct
22	Correct	2 ms	376 KB	Output is correct
23	Correct	2 ms	248 KB	Output is correct
24	Correct	3 ms	376 KB	Output is correct
25	Correct	3 ms	376 KB	Output is correct
26	Correct	2 ms	504 KB	Output is correct
27	Correct	2 ms	504 KB	Output is correct
28	Correct	2 ms	504 KB	Output is correct
29	Correct	3 ms	504 KB	Output is correct
30	Correct	3 ms	504 KB	Output is correct
31	Correct	2 ms	504 KB	Output is correct
32	Correct	2 ms	508 KB	Output is correct
33	Correct	8 ms	1656 KB	Output is correct
34	Correct	9 ms	1656 KB	Output is correct
35	Correct	33 ms	1784 KB	Output is correct
36	Correct	9 ms	2064 KB	Output is correct
37	Correct	10 ms	2040 KB	Output is correct
38	Correct	45 ms	2296 KB	Output is correct
39	Correct	11 ms	2552 KB	Output is correct
40	Correct	12 ms	2552 KB	Output is correct
41	Correct	58 ms	2552 KB	Output is correct
42	Correct	15 ms	2936 KB	Output is correct
43	Correct	16 ms	2936 KB	Output is correct
44	Correct	78 ms	2936 KB	Output is correct
45	Correct	15 ms	3452 KB	Output is correct
46	Correct	16 ms	3448 KB	Output is correct
47	Correct	93 ms	3580 KB	Output is correct
48	Correct	19 ms	4088 KB	Output is correct
49	Correct	19 ms	4088 KB	Output is correct
50	Correct	123 ms	4188 KB	Output is correct
51	Correct	21 ms	4572 KB	Output is correct
52	Correct	23 ms	4600 KB	Output is correct
53	Correct	156 ms	4696 KB	Output is correct
54	Correct	28 ms	5240 KB	Output is correct
55	Correct	30 ms	5240 KB	Output is correct
56	Correct	165 ms	5340 KB	Output is correct
57	Correct	25 ms	5880 KB	Output is correct
58	Correct	25 ms	6008 KB	Output is correct
59	Correct	198 ms	6136 KB	Output is correct
60	Correct	30 ms	6648 KB	Output is correct
61	Correct	31 ms	6652 KB	Output is correct
62	Correct	237 ms	6648 KB	Output is correct
63	Correct	175 ms	6648 KB	Output is correct
64	Correct	291 ms	6648 KB	Output is correct
65	Correct	278 ms	6648 KB	Output is correct
66	Correct	230 ms	6648 KB	Output is correct
67	Correct	188 ms	6648 KB	Output is correct
68	Correct	79 ms	6648 KB	Output is correct
69	Correct	72 ms	6872 KB	Output is correct
70	Correct	63 ms	6652 KB	Output is correct
71	Correct	63 ms	6776 KB	Output is correct
72	Correct	47 ms	6776 KB	Output is correct
73	Correct	64 ms	6904 KB	Output is correct
74	Correct	94 ms	6908 KB	Output is correct
75	Correct	97 ms	6904 KB	Output is correct
76	Correct	89 ms	6904 KB	Output is correct
77	Correct	96 ms	6904 KB	Output is correct
78	Correct	121 ms	6912 KB	Output is correct
79	Correct	78 ms	6904 KB	Output is correct
80	Correct	92 ms	6904 KB	Output is correct
81	Correct	103 ms	6912 KB	Output is correct
82	Correct	94 ms	6904 KB	Output is correct
83	Correct	135 ms	6904 KB	Output is correct
84	Correct	108 ms	6948 KB	Output is correct
85	Correct	111 ms	6904 KB	Output is correct
86	Correct	123 ms	6904 KB	Output is correct
87	Correct	109 ms	6904 KB	Output is correct
88	Correct	128 ms	6872 KB	Output is correct
89	Correct	124 ms	7000 KB	Output is correct
90	Correct	132 ms	6848 KB	Output is correct
91	Correct	119 ms	6904 KB	Output is correct
92	Correct	128 ms	6904 KB	Output is correct