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Submission #550468

# Submission time Handle Problem Language Result Execution time Memory
550468 2022-04-18T09:07:19 Z Jomnoi Mecho (IOI09_mecho) C++17
84 / 100
 156 ms 6312 KB 
#include <bits/stdc++.h>
#define DEBUG false
using namespace std;

const int MAX_N = 810;
const int INF = 1e9 + 7;
const int d[4][2] = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};

char s[MAX_N][MAX_N];
int db[MAX_N][MAX_N], dm[MAX_N][MAX_N];

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    int N, S;
    cin >> N >> S;
    for(int i = 1; i <= N; i++) {
        cin >> (s[i] + 1);
    }

    int sx, sy, ex, ey;
    queue <pair <int, int>> q;
    for(int i = 1; i <= N; i++) {
        for(int j = 1; j <= N; j++) {
            db[i][j] = INF;
            if(s[i][j] == 'H') {
                db[i][j] = 0;
                q.emplace(i, j);
            }
            else if(s[i][j] == 'M') {
                sx = i, sy = j;
            }
            else if(s[i][j] == 'D') {
                ex = i, ey = j;
            }
        }    
    }
    while(!q.empty()) {
        auto [ux, uy] = q.front();
        q.pop();

        for(int i = 0; i < 4; i++) {
            int vx = ux + d[i][0], vy = uy + d[i][1];
            if(vx < 1 or vx > N or vy < 1 or vy > N or s[vx][vy] == 'T' or s[vx][vy] == 'D' or db[vx][vy] != INF) {
                continue;
            }

            db[vx][vy] = db[ux][uy] + 1;
            q.emplace(vx, vy);
        }
    }

    int l = 0, r = 1e6, ans = -1;
    while(l <= r) {
        int mid = (l + r) / 2;

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

        queue <pair <int, int>> q;
        q.emplace(sx, sy);
        dm[sx][sy] = 0;
        while(!q.empty()) {
            auto [ux, uy] = q.front();
            q.pop();

            for(int i = 0; i < 4; i++) {
                int vx = ux + d[i][0], vy = uy + d[i][1];
                if(vx < 1 or vx > N or vy < 1 or vy > N or s[vx][vy] == 'T' or dm[vx][vy] != -1) {
                    continue;
                }
                if((dm[ux][uy] + 1) / S >= db[vx][vy] - mid) {
                    continue;
                }

                dm[vx][vy] = dm[ux][uy] + 1;
                q.emplace(vx, vy);
            }
        }

        if(dm[ex][ey] == -1) {
            r = mid - 1;
        }
        else {
            l = mid + 1;
            ans = mid;
        }
    }
    cout << ans;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:83:21: warning: 'ey' may be used uninitialized in this function [-Wmaybe-uninitialized]
   83 |         if(dm[ex][ey] == -1) {
      |            ~~~~~~~~~^
mecho.cpp:83:21: warning: 'ex' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 84 ms 6168 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Incorrect 1 ms 724 KB Output isn't correct
13 Incorrect 1 ms 596 KB Output isn't correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 0 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 1 ms 596 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 1 ms 724 KB Output is correct
25 Correct 1 ms 724 KB Output is correct
26 Correct 1 ms 724 KB Output is correct
27 Correct 1 ms 724 KB Output is correct
28 Correct 1 ms 724 KB Output is correct
29 Correct 1 ms 724 KB Output is correct
30 Correct 1 ms 724 KB Output is correct
31 Correct 1 ms 852 KB Output is correct
32 Correct 1 ms 852 KB Output is correct
33 Correct 5 ms 2772 KB Output is correct
34 Correct 5 ms 2772 KB Output is correct
35 Correct 18 ms 2772 KB Output is correct
36 Correct 6 ms 3156 KB Output is correct
37 Correct 5 ms 3076 KB Output is correct
38 Correct 26 ms 3176 KB Output is correct
39 Correct 6 ms 3540 KB Output is correct
40 Correct 9 ms 3528 KB Output is correct
41 Correct 35 ms 3540 KB Output is correct
42 Correct 10 ms 3796 KB Output is correct
43 Correct 9 ms 3796 KB Output is correct
44 Correct 43 ms 3864 KB Output is correct
45 Correct 8 ms 4180 KB Output is correct
46 Correct 8 ms 4180 KB Output is correct
47 Correct 51 ms 4180 KB Output is correct
48 Correct 10 ms 4564 KB Output is correct
49 Correct 11 ms 4564 KB Output is correct
50 Correct 65 ms 4516 KB Output is correct
51 Correct 11 ms 4956 KB Output is correct
52 Correct 12 ms 4948 KB Output is correct
53 Correct 70 ms 4948 KB Output is correct
54 Correct 12 ms 5324 KB Output is correct
55 Correct 15 ms 5324 KB Output is correct
56 Correct 89 ms 5332 KB Output is correct
57 Correct 13 ms 5692 KB Output is correct
58 Correct 14 ms 5588 KB Output is correct
59 Correct 91 ms 5588 KB Output is correct
60 Correct 13 ms 5972 KB Output is correct
61 Correct 15 ms 5936 KB Output is correct
62 Correct 107 ms 6024 KB Output is correct
63 Correct 101 ms 6032 KB Output is correct
64 Correct 156 ms 6028 KB Output is correct
65 Correct 134 ms 5944 KB Output is correct
66 Correct 140 ms 6024 KB Output is correct
67 Correct 118 ms 5940 KB Output is correct
68 Correct 41 ms 5964 KB Output is correct
69 Correct 42 ms 5960 KB Output is correct
70 Correct 35 ms 5972 KB Output is correct
71 Correct 30 ms 5968 KB Output is correct
72 Incorrect 29 ms 5964 KB Output isn't correct
73 Incorrect 26 ms 6212 KB Output isn't correct
74 Correct 50 ms 6228 KB Output is correct
75 Correct 55 ms 6300 KB Output is correct
76 Correct 51 ms 6276 KB Output is correct
77 Correct 57 ms 6228 KB Output is correct
78 Correct 66 ms 6312 KB Output is correct
79 Correct 64 ms 6276 KB Output is correct
80 Correct 58 ms 6224 KB Output is correct
81 Correct 60 ms 6184 KB Output is correct
82 Correct 45 ms 6188 KB Output is correct
83 Correct 75 ms 6236 KB Output is correct
84 Correct 64 ms 6236 KB Output is correct
85 Correct 65 ms 6236 KB Output is correct
86 Correct 76 ms 6148 KB Output is correct
87 Correct 63 ms 6240 KB Output is correct
88 Correct 68 ms 6180 KB Output is correct
89 Correct 75 ms 6192 KB Output is correct
90 Correct 74 ms 6224 KB Output is correct
91 Correct 71 ms 6184 KB Output is correct
92 Correct 75 ms 6180 KB Output is correct