oj.uz

Submission #938534

# Submission time Handle Problem Language Result Execution time Memory
938534 2024-03-05T09:18:19 Z mnbvcxz123 Mecho (IOI09_mecho) C++17
100 / 100
 122 ms 7004 KB 
#include <cstdio>
#include <cstring>
#include <queue>
using namespace std;
  
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1};
  
int n,s;
char str[805][805];
  
int vis[805][805];
int dep[805][805];
  
int sx, sy;
  
void bee(){
    queue<int> qx, qy, d;
    for (int i=0; i<n; i++) {
        for (int j=0; j<n; j++) {
            if(str[i][j] == 'H'){
                qx.push(i);
                qy.push(j);
                d.push(0);
                vis[i][j] = 1;
            }
        }
    }
    while (!qx.empty()){
        int xf = qx.front();
        int yf = qy.front();
        int df = d.front();
        qx.pop();
        qy.pop();
        d.pop();
        dep[xf][yf] = df;
        for (int i=0; i<4; i++) {
            int nx = xf + dx[i];
            int ny = yf + dy[i];
            if(nx < 0 || ny < 0 || nx >= n || ny >= n) continue;
            if(vis[nx][ny]) continue;
            if(str[nx][ny] != 'G' && str[nx][ny] != 'M') continue;
            vis[nx][ny] = 1;
            qx.push(nx);
            qy.push(ny);
            d.push(df+1);
        }
    }
}
  
bool trial(int x){
    memset(vis,0,sizeof(vis));
    queue<int> qx, qy, d;
    qx.push(sx);
    qy.push(sy);
    d.push(x * s);
    vis[sx][sy] = 1;
    while (!qx.empty()) {
        int xf = qx.front();
        int yf = qy.front();
        int df = d.front();
        qx.pop();
        qy.pop();
        d.pop();
        if(str[xf][yf] == 'D') return 1;
        for (int i=0; i<4; i++) {
            int nx = xf + dx[i];
            int ny = yf + dy[i];
            if(nx < 0 || ny < 0 || nx >= n || ny >= n) continue;
            if(vis[nx][ny]) continue;
            if(str[nx][ny] != 'G' && str[nx][ny] !='D') continue;
            if(str[nx][ny] != 'D' && (df+1) / s >= dep[nx][ny]) continue;
            vis[nx][ny] = 1;
            qx.push(nx);
            qy.push(ny);
            d.push(df+1);
        }
    }
    return 0;
}
  
int main(){
    scanf("%d %d",&n,&s);
    for (int i=0; i<n; i++) {
        scanf("%s",str[i]);
        for (int j=0; j<n; j++) {
            if(str[i][j] == 'M') sx = i, sy = j;
        }
    }
    bee();
    int s = 0, e = dep[sx][sy]-1;
    while (s != e) {
        int m = (s+e+1)/2;
        if(trial(m)) s = m;
        else e = m-1;
    }
    if(trial(s)) printf("%d",s);
    else printf("-1");
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:82:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |     scanf("%d %d",&n,&s);
      |     ~~~~~^~~~~~~~~~~~~~~
mecho.cpp:84:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         scanf("%s",str[i]);
      |         ~~~~~^~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4596 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 55 ms 6180 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 2 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 4700 KB Output is correct
14 Correct 1 ms 4700 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4440 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1 ms 4444 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct
21 Correct 2 ms 4444 KB Output is correct
22 Correct 3 ms 4440 KB Output is correct
23 Correct 1 ms 4444 KB Output is correct
24 Correct 2 ms 4444 KB Output is correct
25 Correct 1 ms 4696 KB Output is correct
26 Correct 1 ms 4524 KB Output is correct
27 Correct 1 ms 4700 KB Output is correct
28 Correct 1 ms 4700 KB Output is correct
29 Correct 1 ms 4700 KB Output is correct
30 Correct 1 ms 4528 KB Output is correct
31 Correct 1 ms 4700 KB Output is correct
32 Correct 1 ms 4700 KB Output is correct
33 Correct 3 ms 5724 KB Output is correct
34 Correct 4 ms 5724 KB Output is correct
35 Correct 19 ms 5720 KB Output is correct
36 Correct 4 ms 5724 KB Output is correct
37 Correct 4 ms 5724 KB Output is correct
38 Correct 25 ms 5720 KB Output is correct
39 Correct 4 ms 5884 KB Output is correct
40 Correct 4 ms 5976 KB Output is correct
41 Correct 24 ms 5980 KB Output is correct
42 Correct 5 ms 5980 KB Output is correct
43 Correct 6 ms 5980 KB Output is correct
44 Correct 29 ms 5980 KB Output is correct
45 Correct 6 ms 6032 KB Output is correct
46 Correct 6 ms 5980 KB Output is correct
47 Correct 36 ms 5980 KB Output is correct
48 Correct 6 ms 5976 KB Output is correct
49 Correct 6 ms 5980 KB Output is correct
50 Correct 41 ms 5980 KB Output is correct
51 Correct 7 ms 6232 KB Output is correct
52 Correct 7 ms 6204 KB Output is correct
53 Correct 53 ms 6320 KB Output is correct
54 Correct 8 ms 6232 KB Output is correct
55 Correct 8 ms 6236 KB Output is correct
56 Correct 64 ms 6360 KB Output is correct
57 Correct 8 ms 6348 KB Output is correct
58 Correct 10 ms 6236 KB Output is correct
59 Correct 69 ms 6440 KB Output is correct
60 Correct 9 ms 6492 KB Output is correct
61 Correct 10 ms 6492 KB Output is correct
62 Correct 82 ms 6320 KB Output is correct
63 Correct 73 ms 6504 KB Output is correct
64 Correct 122 ms 6484 KB Output is correct
65 Correct 120 ms 6408 KB Output is correct
66 Correct 106 ms 6492 KB Output is correct
67 Correct 86 ms 6772 KB Output is correct
68 Correct 35 ms 6488 KB Output is correct
69 Correct 30 ms 6488 KB Output is correct
70 Correct 29 ms 6548 KB Output is correct
71 Correct 28 ms 6492 KB Output is correct
72 Correct 22 ms 6492 KB Output is correct
73 Correct 24 ms 6744 KB Output is correct
74 Correct 42 ms 6792 KB Output is correct
75 Correct 44 ms 7004 KB Output is correct
76 Correct 52 ms 6880 KB Output is correct
77 Correct 43 ms 6744 KB Output is correct
78 Correct 49 ms 6748 KB Output is correct
79 Correct 37 ms 6752 KB Output is correct
80 Correct 41 ms 6744 KB Output is correct
81 Correct 51 ms 6840 KB Output is correct
82 Correct 39 ms 6748 KB Output is correct
83 Correct 54 ms 6740 KB Output is correct
84 Correct 47 ms 6492 KB Output is correct
85 Correct 49 ms 6748 KB Output is correct
86 Correct 54 ms 6736 KB Output is correct
87 Correct 55 ms 6712 KB Output is correct
88 Correct 56 ms 6788 KB Output is correct
89 Correct 54 ms 6748 KB Output is correct
90 Correct 59 ms 6740 KB Output is correct
91 Correct 58 ms 6748 KB Output is correct
92 Correct 65 ms 6772 KB Output is correct