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Submission #535621

# Submission time Handle Problem Language Result Execution time Memory
535621 2022-03-10T16:50:42 Z louiskwok Mecho (IOI09_mecho) C++17
57 / 100
 194 ms 17932 KB 
#include <bits/stdc++.h>
using namespace std;
bool visited[805][805];
int distBee[805][805];
double distBear[805][805];
char g[805][805];
int dr[] = {-1,0,1,0};
int dc[] = {0,1,0,-1};
int n,sr,sc,er,ec,mxtime;
double s;
bool success;
bool possible(double t) {
    memset(visited,0,sizeof visited);
    queue < pair<int,int> > bfs;
    distBear[sr][sc] = t;
    bfs.push({sr,sc});
    while (!bfs.empty()) {
        int curR = bfs.front().first;
        int curC = bfs.front().second;
        bfs.pop();
        for (int i=0;i<4;i++) {
            int nr = curR + dr[i];
            int nc = curC + dc[i];
            if (nr<1||nr>n||nc<1||nc>n||visited[nr][nc]||g[nr][nc]=='T'||distBear[curR][curC]+(double)1/s>=(double)distBee[nr][nc]) continue;
            visited[nr][nc] = true;
            distBear[nr][nc] = distBear[curR][curC]+1/s;
            bfs.push({nr,nc});
        }
    }
    if (visited[er][ec]) {
        success = true;
        return true;
    }
    return false;
}
int main() {
    queue < pair<int,int> > bfs;
    cin >> n >> s;
    for (int i=1;i<=n;i++) {
        for (int j=1;j<=n;j++) {
            cin >> g[i][j];
            if (g[i][j]=='M') sr = i,sc = j;
            else if (g[i][j]=='D') er = i,ec = j;
            else if (g[i][j]=='H') {
                visited[i][j] = true;
                bfs.push({i,j});
            }
        }
    }
    while (!bfs.empty()) {
        int curR = bfs.front().first;
        int curC = bfs.front().second;
        bfs.pop();
        for (int i=0;i<4;i++) {
            int nr = curR + dr[i];
            int nc = curC + dc[i];
            if (nr==sr&&nc==sc) distBee[nr][nc] = distBee[curR][curC]+1;
            if (nr<1||nr>n||nc<1||nc>n||visited[nr][nc]||g[nr][nc]=='T'||g[nr][nc]=='M') continue;
            visited[nr][nc] = true;
            distBee[nr][nc] = distBee[curR][curC]+1;
            mxtime = max(mxtime,distBee[nr][nc]);
            bfs.push({nr,nc});
        }
    }
    int lo = 0,hi = distBee[sr][sc]-1;
    while (lo<hi) {
        int mid = (lo+hi+1)/2;
        if (possible((double)mid)) lo = mid;
        else hi = mid-1;
    }
    if (!possible(0)) cout << -1/0 << endl;
    else cout << lo << endl;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:71:33: warning: division by zero [-Wdiv-by-zero]
   71 |     if (!possible(0)) cout << -1/0 << endl;
      |                               ~~^~

Subtask #1
57.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 852 KB Output is correct
2 Runtime error 2 ms 1748 KB Execution killed with signal 8
3 Correct 1 ms 980 KB Output is correct
4 Incorrect 1 ms 980 KB Output isn't correct
5 Correct 1 ms 980 KB Output is correct
6 Runtime error 2 ms 1876 KB Execution killed with signal 8
7 Incorrect 120 ms 9140 KB Output isn't correct
8 Runtime error 2 ms 1876 KB Execution killed with signal 8
9 Correct 1 ms 980 KB Output is correct
10 Correct 1 ms 980 KB Output is correct
11 Correct 1 ms 980 KB Output is correct
12 Runtime error 2 ms 2644 KB Execution killed with signal 8
13 Incorrect 1 ms 1236 KB Output isn't correct
14 Runtime error 3 ms 2388 KB Execution killed with signal 8
15 Correct 1 ms 980 KB Output is correct
16 Correct 1 ms 1108 KB Output is correct
17 Correct 1 ms 980 KB Output is correct
18 Correct 1 ms 1108 KB Output is correct
19 Correct 1 ms 1108 KB Output is correct
20 Correct 1 ms 1108 KB Output is correct
21 Correct 1 ms 1108 KB Output is correct
22 Correct 1 ms 1236 KB Output is correct
23 Correct 1 ms 1236 KB Output is correct
24 Correct 1 ms 1364 KB Output is correct
25 Correct 1 ms 1236 KB Output is correct
26 Correct 1 ms 1364 KB Output is correct
27 Correct 2 ms 1236 KB Output is correct
28 Correct 2 ms 1492 KB Output is correct
29 Correct 1 ms 1364 KB Output is correct
30 Correct 2 ms 1492 KB Output is correct
31 Correct 2 ms 1364 KB Output is correct
32 Correct 2 ms 1492 KB Output is correct
33 Correct 11 ms 3168 KB Output is correct
34 Correct 15 ms 4272 KB Output is correct
35 Correct 29 ms 4516 KB Output is correct
36 Correct 15 ms 3540 KB Output is correct
37 Correct 16 ms 4828 KB Output is correct
38 Correct 35 ms 4928 KB Output is correct
39 Correct 18 ms 3820 KB Output is correct
40 Correct 20 ms 5324 KB Output is correct
41 Correct 47 ms 5452 KB Output is correct
42 Correct 22 ms 4200 KB Output is correct
43 Correct 25 ms 5932 KB Output is correct
44 Correct 65 ms 6160 KB Output is correct
45 Correct 26 ms 4440 KB Output is correct
46 Correct 28 ms 6420 KB Output is correct
47 Correct 65 ms 6460 KB Output is correct
48 Correct 30 ms 4808 KB Output is correct
49 Correct 33 ms 6964 KB Output is correct
50 Correct 79 ms 6960 KB Output is correct
51 Correct 36 ms 5104 KB Output is correct
52 Correct 38 ms 7316 KB Output is correct
53 Correct 104 ms 7452 KB Output is correct
54 Correct 41 ms 5384 KB Output is correct
55 Correct 45 ms 7756 KB Output is correct
56 Correct 122 ms 8052 KB Output is correct
57 Correct 47 ms 5820 KB Output is correct
58 Correct 54 ms 8140 KB Output is correct
59 Correct 141 ms 8480 KB Output is correct
60 Correct 52 ms 6024 KB Output is correct
61 Correct 57 ms 8608 KB Output is correct
62 Correct 166 ms 9096 KB Output is correct
63 Correct 128 ms 8936 KB Output is correct
64 Correct 189 ms 9108 KB Output is correct
65 Correct 194 ms 9056 KB Output is correct
66 Correct 182 ms 9120 KB Output is correct
67 Runtime error 153 ms 17860 KB Execution killed with signal 8
68 Correct 75 ms 8572 KB Output is correct
69 Correct 69 ms 8836 KB Output is correct
70 Correct 67 ms 8456 KB Output is correct
71 Correct 69 ms 8632 KB Output is correct
72 Runtime error 101 ms 17932 KB Execution killed with signal 8
73 Incorrect 94 ms 9304 KB Output isn't correct
74 Correct 97 ms 9344 KB Output is correct
75 Correct 102 ms 9292 KB Output is correct
76 Correct 89 ms 9152 KB Output is correct
77 Correct 94 ms 9344 KB Output is correct
78 Runtime error 108 ms 13516 KB Execution killed with signal 8
79 Correct 94 ms 9324 KB Output is correct
80 Correct 91 ms 6728 KB Output is correct
81 Correct 100 ms 6732 KB Output is correct
82 Correct 91 ms 6876 KB Output is correct
83 Correct 98 ms 6696 KB Output is correct
84 Correct 107 ms 9248 KB Output is correct
85 Correct 94 ms 6752 KB Output is correct
86 Correct 107 ms 6728 KB Output is correct
87 Correct 103 ms 7052 KB Output is correct
88 Correct 107 ms 7048 KB Output is correct
89 Correct 113 ms 9188 KB Output is correct
90 Correct 116 ms 8316 KB Output is correct
91 Correct 125 ms 9296 KB Output is correct
92 Correct 115 ms 7148 KB Output is correct