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Submission #1051110

# Submission time Handle Problem Language Result Execution time Memory
1051110 2024-08-09T20:01:00 Z kvintsekstakord Mecho (IOI09_mecho) C++17
38 / 100
 119 ms 8276 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
38.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 4444 KB Output isn't correct
2 Incorrect 0 ms 4444 KB Output isn't correct
3 Incorrect 0 ms 4444 KB Output isn't correct
4 Incorrect 0 ms 4444 KB Output isn't correct
5 Correct 0 ms 4444 KB Output is correct
6 Correct 0 ms 4444 KB Output is correct
7 Correct 52 ms 7592 KB Output is correct
8 Incorrect 1 ms 4440 KB Output isn't correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 0 ms 4544 KB Output is correct
11 Correct 0 ms 4444 KB Output is correct
12 Incorrect 1 ms 4440 KB Output isn't correct
13 Incorrect 1 ms 4444 KB Output isn't correct
14 Correct 1 ms 4444 KB Output is correct
15 Incorrect 0 ms 4444 KB Output isn't correct
16 Correct 1 ms 4440 KB Output is correct
17 Incorrect 1 ms 4444 KB Output isn't correct
18 Correct 1 ms 4444 KB Output is correct
19 Incorrect 0 ms 4536 KB Output isn't correct
20 Correct 0 ms 4444 KB Output is correct
21 Incorrect 1 ms 4536 KB Output isn't correct
22 Correct 1 ms 4440 KB Output is correct
23 Incorrect 0 ms 4444 KB Output isn't correct
24 Correct 1 ms 4440 KB Output is correct
25 Incorrect 1 ms 4444 KB Output isn't correct
26 Correct 0 ms 4444 KB Output is correct
27 Incorrect 0 ms 4444 KB Output isn't correct
28 Correct 1 ms 4444 KB Output is correct
29 Incorrect 1 ms 4444 KB Output isn't correct
30 Correct 1 ms 4444 KB Output is correct
31 Incorrect 1 ms 4444 KB Output isn't correct
32 Correct 1 ms 4444 KB Output is correct
33 Incorrect 4 ms 6712 KB Output isn't correct
34 Correct 5 ms 6748 KB Output is correct
35 Correct 12 ms 6748 KB Output is correct
36 Incorrect 6 ms 6704 KB Output isn't correct
37 Correct 5 ms 6748 KB Output is correct
38 Correct 16 ms 6748 KB Output is correct
39 Incorrect 7 ms 6796 KB Output isn't correct
40 Correct 7 ms 6748 KB Output is correct
41 Correct 20 ms 6988 KB Output is correct
42 Incorrect 8 ms 6840 KB Output isn't correct
43 Correct 8 ms 6848 KB Output is correct
44 Correct 26 ms 7004 KB Output is correct
45 Incorrect 11 ms 7004 KB Output isn't correct
46 Correct 10 ms 6892 KB Output is correct
47 Correct 30 ms 6960 KB Output is correct
48 Incorrect 12 ms 7004 KB Output isn't correct
49 Correct 11 ms 7004 KB Output is correct
50 Correct 36 ms 7124 KB Output is correct
51 Incorrect 14 ms 7004 KB Output isn't correct
52 Correct 14 ms 7000 KB Output is correct
53 Correct 46 ms 7000 KB Output is correct
54 Incorrect 16 ms 7004 KB Output isn't correct
55 Correct 15 ms 7000 KB Output is correct
56 Correct 51 ms 7084 KB Output is correct
57 Incorrect 18 ms 7144 KB Output isn't correct
58 Correct 18 ms 7148 KB Output is correct
59 Correct 59 ms 7260 KB Output is correct
60 Incorrect 22 ms 7256 KB Output isn't correct
61 Correct 20 ms 7308 KB Output is correct
62 Correct 67 ms 7492 KB Output is correct
63 Correct 76 ms 7260 KB Output is correct
64 Correct 119 ms 7256 KB Output is correct
65 Correct 91 ms 7260 KB Output is correct
66 Incorrect 81 ms 7260 KB Output isn't correct
67 Correct 72 ms 7260 KB Output is correct
68 Correct 38 ms 7516 KB Output is correct
69 Correct 37 ms 7504 KB Output is correct
70 Correct 31 ms 7544 KB Output is correct
71 Correct 35 ms 7508 KB Output is correct
72 Incorrect 29 ms 7508 KB Output isn't correct
73 Incorrect 31 ms 8272 KB Output isn't correct
74 Correct 47 ms 8276 KB Output is correct
75 Correct 45 ms 8276 KB Output is correct
76 Correct 43 ms 8272 KB Output is correct
77 Correct 43 ms 8276 KB Output is correct
78 Correct 49 ms 7976 KB Output is correct
79 Correct 36 ms 8208 KB Output is correct
80 Correct 41 ms 8044 KB Output is correct
81 Correct 46 ms 8200 KB Output is correct
82 Correct 52 ms 8020 KB Output is correct
83 Correct 50 ms 7856 KB Output is correct
84 Correct 55 ms 7860 KB Output is correct
85 Correct 51 ms 8024 KB Output is correct
86 Correct 48 ms 8024 KB Output is correct
87 Correct 49 ms 8020 KB Output is correct
88 Correct 50 ms 7772 KB Output is correct
89 Correct 52 ms 7760 KB Output is correct
90 Correct 54 ms 7772 KB Output is correct
91 Correct 52 ms 7772 KB Output is correct
92 Correct 54 ms 7944 KB Output is correct