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Submission #1050734

# Submission time Handle Problem Language Result Execution time Memory
1050734 2024-08-09T13:42:14 Z kvintsekstakord Mecho (IOI09_mecho) C++17
84 / 100
 124 ms 7648 KB 
#include <bits/stdc++.h>
#define int int64_t
using namespace std;

int N, S;
char forest[810][810];
int btime[810][810];
bool visited[810][810];

int dx[]={1, -1, 0, 0};
int dy[]={0, 0, 1, -1};

struct src{
    int x, y;
    int step;
    src(int x, int y, int step) : x(x), y(y), step(step){};
};

int32_t main()
{
    cin >> N >> S;
    queue<src> bfs;
    int si, sj;
    int hi, hj;
    for(int i = 1; i <= N; i++){
        for(int j = 1; j <= N; j++){
            cin >> forest[i][j];
            btime[i][j]=1e9;

            if(forest[i][j]=='H'){
                bfs.push(src(i, j, 0));
                btime[i][j]=0;
            }
            if(forest[i][j]=='M'){
                si = i;
                sj = j;
            }
            if(forest[i][j]=='D'){
                hi=i; hj=j;
            }

        }
    }

    while(!bfs.empty()){
        int x = bfs.front().x;
        int y = bfs.front().y;
        int step = bfs.front().step;
        bfs.pop();
        for(int i = 0; i < 4; i++){
            int nx = x+dx[i];
            int ny = y+dy[i];
            if(nx<1 || nx>N || ny<1 || ny>N) continue;
            if(forest[nx][ny]=='T' || forest[nx][ny]=='D') continue;
            if(step+1<btime[nx][ny]){
                btime[nx][ny]=(step+1);
                bfs.push(src(nx, ny, step+1));
            }
        }
    }
    for(int i = 1; i <= N; i++){
        for(int j = 1; j <= N; j++){
            btime[i][j]*=S;
        }
    }
    int lo = 0;
    int hig = N*N;
    lo--;
    while(lo<hig){
        int mid = lo+(hig-lo+1)/2;

        queue<src> bfs2;
        for(int i = 1; i <= N; i++){
            for(int j = 1; j <= N; j++){
                visited[i][j]=false;
            }
        }
        visited[si][sj]=true;
        bfs2.push({si, sj, mid*S});
        bool possible = false;
        while(!bfs2.empty()){
            int x = bfs2.front().x;
            int y = bfs2.front().y;
            int step = bfs2.front().step;

            bfs2.pop();
            for(int i = 0; i < 4; i++){
                int nx = x+dx[i];
                int ny = y+dy[i];
                if(nx<1 || nx>N || ny<1 || ny>N) continue;
                if(forest[nx][ny]=='T') continue;
                if(forest[nx][ny]=='D'){
                    possible = true;
                    break;
                }
                if(visited[nx][ny]) continue;
                if( step+1<btime[nx][ny]){
                    visited[nx][ny]=true;
                    bfs2.push(src(nx, ny, step+1));
                }
            }
            if(possible) break;
        }

        if(possible){
            lo = mid;
        }else{
            hig = mid-1;
        }
    }
    cout << lo;

    return 0;
}

Compilation message

mecho.cpp: In function 'int32_t main()':
mecho.cpp:24:9: warning: variable 'hi' set but not used [-Wunused-but-set-variable]
   24 |     int hi, hj;
      |         ^~
mecho.cpp:24:13: warning: variable 'hj' set but not used [-Wunused-but-set-variable]
   24 |     int hi, hj;
      |             ^~
mecho.cpp:16:56: warning: 'si' may be used uninitialized in this function [-Wmaybe-uninitialized]
   16 |     src(int x, int y, int step) : x(x), y(y), step(step){};
      |                                                        ^
mecho.cpp:23:9: note: 'si' was declared here
   23 |     int si, sj;
      |         ^~
mecho.cpp:16:56: warning: 'sj' may be used uninitialized in this function [-Wmaybe-uninitialized]
   16 |     src(int x, int y, int step) : x(x), y(y), step(step){};
      |                                                        ^
mecho.cpp:23:13: note: 'sj' was declared here
   23 |     int si, sj;
      |             ^~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 0 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 0 ms 4444 KB Output is correct
7 Correct 58 ms 6920 KB Output is correct
8 Correct 0 ms 4440 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 0 ms 4444 KB Output is correct
11 Correct 0 ms 4444 KB Output is correct
12 Incorrect 0 ms 4444 KB Output isn't correct
13 Incorrect 0 ms 4444 KB Output isn't correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 0 ms 4444 KB Output is correct
16 Correct 0 ms 4444 KB Output is correct
17 Correct 0 ms 4444 KB Output is correct
18 Correct 0 ms 4444 KB Output is correct
19 Correct 0 ms 4444 KB Output is correct
20 Correct 0 ms 4444 KB Output is correct
21 Correct 1 ms 4444 KB Output is correct
22 Correct 1 ms 4444 KB Output is correct
23 Correct 1 ms 4444 KB Output is correct
24 Correct 0 ms 4444 KB Output is correct
25 Correct 0 ms 4444 KB Output is correct
26 Correct 0 ms 4444 KB Output is correct
27 Correct 1 ms 4540 KB Output is correct
28 Correct 1 ms 4440 KB Output is correct
29 Correct 1 ms 4444 KB Output is correct
30 Correct 1 ms 4444 KB Output is correct
31 Correct 1 ms 4444 KB Output is correct
32 Correct 1 ms 4444 KB Output is correct
33 Correct 4 ms 6748 KB Output is correct
34 Correct 4 ms 6748 KB Output is correct
35 Correct 12 ms 6748 KB Output is correct
36 Correct 6 ms 6748 KB Output is correct
37 Correct 6 ms 6748 KB Output is correct
38 Correct 16 ms 6748 KB Output is correct
39 Correct 7 ms 6748 KB Output is correct
40 Correct 7 ms 6748 KB Output is correct
41 Correct 21 ms 6784 KB Output is correct
42 Correct 9 ms 6748 KB Output is correct
43 Correct 9 ms 6768 KB Output is correct
44 Correct 26 ms 6748 KB Output is correct
45 Correct 10 ms 6748 KB Output is correct
46 Correct 10 ms 6748 KB Output is correct
47 Correct 34 ms 7004 KB Output is correct
48 Correct 12 ms 6748 KB Output is correct
49 Correct 11 ms 6596 KB Output is correct
50 Correct 35 ms 6768 KB Output is correct
51 Correct 14 ms 6748 KB Output is correct
52 Correct 13 ms 6596 KB Output is correct
53 Correct 43 ms 6768 KB Output is correct
54 Correct 16 ms 6744 KB Output is correct
55 Correct 15 ms 6748 KB Output is correct
56 Correct 51 ms 6776 KB Output is correct
57 Correct 18 ms 6744 KB Output is correct
58 Correct 17 ms 6748 KB Output is correct
59 Correct 59 ms 6812 KB Output is correct
60 Correct 21 ms 6848 KB Output is correct
61 Correct 22 ms 6844 KB Output is correct
62 Correct 67 ms 6748 KB Output is correct
63 Correct 65 ms 6748 KB Output is correct
64 Correct 124 ms 6740 KB Output is correct
65 Correct 88 ms 6844 KB Output is correct
66 Correct 78 ms 6744 KB Output is correct
67 Correct 71 ms 6748 KB Output is correct
68 Correct 37 ms 6748 KB Output is correct
69 Correct 37 ms 6748 KB Output is correct
70 Correct 31 ms 6760 KB Output is correct
71 Correct 33 ms 6744 KB Output is correct
72 Incorrect 30 ms 6764 KB Output isn't correct
73 Incorrect 31 ms 7516 KB Output isn't correct
74 Correct 50 ms 7648 KB Output is correct
75 Correct 45 ms 7516 KB Output is correct
76 Correct 42 ms 7516 KB Output is correct
77 Correct 41 ms 7516 KB Output is correct
78 Correct 52 ms 7412 KB Output is correct
79 Correct 35 ms 7512 KB Output is correct
80 Correct 51 ms 7576 KB Output is correct
81 Correct 44 ms 7596 KB Output is correct
82 Correct 41 ms 7388 KB Output is correct
83 Correct 51 ms 7260 KB Output is correct
84 Correct 58 ms 7284 KB Output is correct
85 Correct 49 ms 7260 KB Output is correct
86 Correct 48 ms 7260 KB Output is correct
87 Correct 52 ms 7368 KB Output is correct
88 Correct 50 ms 7260 KB Output is correct
89 Correct 51 ms 7104 KB Output is correct
90 Correct 52 ms 7252 KB Output is correct
91 Correct 51 ms 7260 KB Output is correct
92 Correct 54 ms 7104 KB Output is correct