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Submission #982894

# Submission time Handle Problem Language Result Execution time Memory
982894 2024-05-15T01:34:50 Z doducanh Mecho (IOI09_mecho) C++17
79 / 100
 168 ms 7004 KB 
#include <bits/stdc++.h>

using namespace std;
int dx[4]={0,1,-1,0};
int dy[4]={1,0,0,-1};
string fields[805];
int beetime[805][805];
int mechotime[805][805];
int n,s;
bool check(int x,int y)
{
    return (x>=0&&x<n&&y>=0&&y<n&&(fields[x][y]=='G'||fields[x][y]=='M'));
}
bool is_acc(int x,int y)
{
    return ((x/s)<y);
}
int main()
{
    cin>>n>>s;
    for(int i=0;i<n;i++)cin>>fields[i];
    int mechoposx,mechoposy;
    int mechohomex,mechohomey;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            beetime[i][j]=-1;
        }
    }
    queue<pair<int,int>>q;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(fields[i][j]=='M'){
                mechoposx=i;
                mechoposy=j;
            }
            if(fields[i][j]=='D'){
                mechohomex=i;
                mechohomey=j;
            }
            if(fields[i][j]=='H'){
                beetime[i][j]=0;
                q.push({i,j});
            }
        }
    }
    while(q.size()){
        int x=q.front().first;
        int y=q.front().second;
        q.pop();
        for(int i=0;i<4;i++){
            int nx=x+dx[i];
            int ny=y+dy[i];
            if(check(nx,ny)&&beetime[nx][ny]==-1){
                beetime[nx][ny]=beetime[x][y]+1;
                q.push({nx,ny});
            }
        }
    }
    int l=0,r=n*n;
    int res=0;
    while(l<=r){
        int eating_time=(l+r)/2;
        q.push({mechoposx,mechoposy});
        if(beetime[mechoposx][mechoposy]<=eating_time)q.pop();
        bool acc=false;
        for(int i=0;i<n;i++){
            for(int j=0;j<n;j++){
                mechotime[i][j]=-1;
            }
        }
        mechotime[mechoposx][mechoposy]=0;
        while(q.size()){
            int x=q.front().first;
            int y=q.front().second;
            q.pop();
            for(int i=0;i<4;i++)
            {
                int nx=x+dx[i];
                int ny=y+dy[i];
                if(check(nx,ny)&&mechotime[nx][ny]==-1&&is_acc(mechotime[x][y]+1,beetime[nx][ny]-eating_time)) {
                    mechotime[nx][ny]=mechotime[x][y]+1;
                    q.push({nx,ny});
                }
            }
        }
        for(int i=0;i<4;i++){
            int nx=mechohomex+dx[i];
            int ny=mechohomey+dy[i];
            if(check(nx,ny)&&mechotime[nx][ny]!=-1){
                acc=true;
                break;
            }
        }
        if(acc){
            res=eating_time;
            l=eating_time+1;
        }
        else r=eating_time-1;
    }
    cout<<res;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:71:40: warning: 'mechoposy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   71 |         mechotime[mechoposx][mechoposy]=0;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
mecho.cpp:71:40: warning: 'mechoposx' may be used uninitialized in this function [-Wmaybe-uninitialized]
mecho.cpp:88:17: warning: 'mechohomey' may be used uninitialized in this function [-Wmaybe-uninitialized]
   88 |             int ny=mechohomey+dy[i];
      |                 ^~
mecho.cpp:87:17: warning: 'mechohomex' may be used uninitialized in this function [-Wmaybe-uninitialized]
   87 |             int nx=mechohomex+dx[i];
      |                 ^~

Subtask #1
79.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 65 ms 6264 KB Output is correct
8 Incorrect 1 ms 2396 KB Output isn't correct
9 Correct 1 ms 2516 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Incorrect 1 ms 4700 KB Output isn't correct
13 Correct 1 ms 2652 KB Output is correct
14 Incorrect 1 ms 4748 KB Output isn't correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2392 KB Output is correct
19 Correct 1 ms 2392 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2652 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 2652 KB Output is correct
24 Correct 1 ms 2652 KB Output is correct
25 Correct 1 ms 4700 KB Output is correct
26 Correct 1 ms 4700 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 4700 KB Output is correct
31 Correct 1 ms 4700 KB Output is correct
32 Correct 1 ms 4568 KB Output is correct
33 Correct 5 ms 4956 KB Output is correct
34 Correct 5 ms 4956 KB Output is correct
35 Correct 17 ms 4992 KB Output is correct
36 Correct 6 ms 4956 KB Output is correct
37 Correct 7 ms 4956 KB Output is correct
38 Correct 22 ms 5028 KB Output is correct
39 Correct 7 ms 4956 KB Output is correct
40 Correct 8 ms 5100 KB Output is correct
41 Correct 40 ms 4956 KB Output is correct
42 Correct 9 ms 5208 KB Output is correct
43 Correct 9 ms 5212 KB Output is correct
44 Correct 38 ms 5212 KB Output is correct
45 Correct 11 ms 5468 KB Output is correct
46 Correct 11 ms 5468 KB Output is correct
47 Correct 41 ms 5476 KB Output is correct
48 Correct 17 ms 5464 KB Output is correct
49 Correct 13 ms 5556 KB Output is correct
50 Correct 52 ms 5640 KB Output is correct
51 Correct 15 ms 5724 KB Output is correct
52 Correct 16 ms 5932 KB Output is correct
53 Correct 62 ms 5736 KB Output is correct
54 Correct 17 ms 5980 KB Output is correct
55 Correct 17 ms 5980 KB Output is correct
56 Correct 74 ms 5980 KB Output is correct
57 Correct 19 ms 6204 KB Output is correct
58 Correct 21 ms 6236 KB Output is correct
59 Correct 101 ms 6420 KB Output is correct
60 Correct 21 ms 6492 KB Output is correct
61 Correct 22 ms 6492 KB Output is correct
62 Correct 94 ms 6484 KB Output is correct
63 Correct 91 ms 6664 KB Output is correct
64 Correct 168 ms 6640 KB Output is correct
65 Correct 123 ms 6696 KB Output is correct
66 Correct 102 ms 6892 KB Output is correct
67 Incorrect 113 ms 6480 KB Output isn't correct
68 Correct 50 ms 6740 KB Output is correct
69 Correct 42 ms 6480 KB Output is correct
70 Correct 33 ms 6544 KB Output is correct
71 Correct 38 ms 6612 KB Output is correct
72 Correct 28 ms 6480 KB Output is correct
73 Correct 29 ms 6796 KB Output is correct
74 Correct 49 ms 6736 KB Output is correct
75 Correct 58 ms 7004 KB Output is correct
76 Correct 61 ms 6740 KB Output is correct
77 Correct 59 ms 6784 KB Output is correct
78 Incorrect 71 ms 6760 KB Output isn't correct
79 Correct 42 ms 6748 KB Output is correct
80 Correct 53 ms 6888 KB Output is correct
81 Correct 56 ms 6892 KB Output is correct
82 Correct 51 ms 6844 KB Output is correct
83 Correct 63 ms 6736 KB Output is correct
84 Correct 55 ms 6484 KB Output is correct
85 Correct 63 ms 6736 KB Output is correct
86 Correct 60 ms 6912 KB Output is correct
87 Correct 60 ms 6736 KB Output is correct
88 Correct 64 ms 6696 KB Output is correct
89 Correct 63 ms 6816 KB Output is correct
90 Correct 66 ms 6860 KB Output is correct
91 Correct 70 ms 6840 KB Output is correct
92 Correct 69 ms 6736 KB Output is correct