oj.uz

Submission #335748

# Submission time Handle Problem Language Result Execution time Memory
335748 2020-12-13T20:28:10 Z Christopher_Rdz Mecho (IOI09_mecho) C++14
12 / 100
 42 ms 9452 KB 
#include <bits/stdc++.h>
using namespace std;
struct node{
    int i;
    int j;
    node(){}
    node(int I,int J){
        i=I;
        j=J;
    }
};
queue<node> Q;
char forest[805][805];
int bees[805][805];
int dist[805][805];
int energy[805][805];
int dx[4]={1,-1,0,0};
int dy[4]={0,0,1,-1};
int n,s;

void bfsBees(){
    while(!Q.empty()){
        node u=Q.front();
        Q.pop();
        for(int mov=0;mov<4;mov++){
            int i=u.i+dx[mov];
            int j=u.j+dy[mov];
            if(i<1 || i>n) continue;
            if(j<1 || j>n) continue;
            if(forest[i][j]=='T' || forest[i][j]=='D') continue;
            if(bees[i][j]==INT_MAX){
                bees[i][j]=bees[u.i][u.j]+1;
                Q.push(node(i,j));
            }
        }
    }
}

node mecho;
node home;

bool bfsMecho(int init){
    if(bees[mecho.i][mecho.j]<=init) return false;
    dist[mecho.i][mecho.j]=init;
    energy[mecho.i][mecho.j]=0;
    Q.push(mecho);
    while(!Q.empty()){
        node u=Q.front();
        Q.pop();
        if(bees[u.i][u.j]==dist[u.i][u.j] && energy[u.i][u.j]==0) continue;
        for(int mov=0;mov<4;mov++){
            int i=u.i+dx[mov];
            int j=u.j+dy[mov];
            if(i<1 || i>n) continue;
            if(j<1 || j>n) continue;
            if(forest[i][j]=='T') continue;
            if(dist[i][j]==INT_MAX){
                int change=(energy[u.i][u.j]>0)? 0 : 1;
                dist[i][j]=dist[u.i][u.j]+change;
                if(bees[i][j]<dist[i][j]) continue;
                energy[i][j]=(energy[u.i][u.j]>0)? energy[u.i][u.j]-1 : s-1;
                Q.push(node(i,j));
            }
        }
    }
    return dist[home.i][home.j]!=INT_MAX;
}

int binarySearch(){
    int k=-1;
    int L=0,R=3*n;
    while(L<R){
        int mid=(L+R)/2;
        if(bfsMecho(mid)){
            k=mid;
            L=mid+1;
        }
        else{
            R=mid;
        }
    }
    return k;
}

int binarySearch2(){
    int k=-1;
    for(int b=5000;b>=1;b/=2){
        while(bfsMecho(b+k)) k+=b;
    }
    return k;
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>s;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            cin>>forest[i][j];            dist[i][j]=INT_MAX;
            energy[i][j]=0;
            if(forest[i][j]=='M'){
                mecho=node(i,j);
            }
            else if(forest[i][j]=='D'){
                home=node(i,j);
            }            bees[i][j]=INT_MAX;
            if(forest[i][j]=='H'){
                Q.push(node(i,j));
                bees[i][j]=0;            }
        }
    }        
    bfsBees();
    int ans=binarySearch2();
    cout<<ans<<endl;
    return 0;
}

Subtask #1
12.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Incorrect 1 ms 384 KB Output isn't correct
3 Incorrect 1 ms 384 KB Output isn't correct
4 Incorrect 1 ms 364 KB Output isn't correct
5 Incorrect 1 ms 512 KB Output isn't correct
6 Incorrect 1 ms 492 KB Output isn't correct
7 Incorrect 36 ms 9324 KB Output isn't correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Incorrect 1 ms 492 KB Output isn't correct
11 Incorrect 1 ms 620 KB Output isn't correct
12 Correct 1 ms 1004 KB Output is correct
13 Correct 1 ms 876 KB Output is correct
14 Correct 1 ms 1024 KB Output is correct
15 Incorrect 1 ms 620 KB Output isn't correct
16 Incorrect 1 ms 620 KB Output isn't correct
17 Incorrect 1 ms 620 KB Output isn't correct
18 Incorrect 1 ms 620 KB Output isn't correct
19 Incorrect 1 ms 620 KB Output isn't correct
20 Incorrect 1 ms 620 KB Output isn't correct
21 Incorrect 1 ms 748 KB Output isn't correct
22 Incorrect 1 ms 748 KB Output isn't correct
23 Incorrect 1 ms 876 KB Output isn't correct
24 Incorrect 1 ms 876 KB Output isn't correct
25 Incorrect 1 ms 1004 KB Output isn't correct
26 Incorrect 1 ms 1004 KB Output isn't correct
27 Incorrect 1 ms 1004 KB Output isn't correct
28 Incorrect 1 ms 1004 KB Output isn't correct
29 Incorrect 1 ms 1132 KB Output isn't correct
30 Incorrect 1 ms 1132 KB Output isn't correct
31 Incorrect 1 ms 1132 KB Output isn't correct
32 Incorrect 1 ms 1132 KB Output isn't correct
33 Incorrect 7 ms 4076 KB Output isn't correct
34 Incorrect 7 ms 4076 KB Output isn't correct
35 Incorrect 9 ms 4076 KB Output isn't correct
36 Incorrect 8 ms 4588 KB Output isn't correct
37 Incorrect 9 ms 4588 KB Output isn't correct
38 Incorrect 11 ms 4588 KB Output isn't correct
39 Incorrect 10 ms 5100 KB Output isn't correct
40 Incorrect 11 ms 5100 KB Output isn't correct
41 Incorrect 14 ms 5228 KB Output isn't correct
42 Incorrect 12 ms 5740 KB Output isn't correct
43 Incorrect 13 ms 5740 KB Output isn't correct
44 Incorrect 17 ms 5740 KB Output isn't correct
45 Incorrect 14 ms 6252 KB Output isn't correct
46 Incorrect 15 ms 6252 KB Output isn't correct
47 Incorrect 21 ms 6252 KB Output isn't correct
48 Incorrect 16 ms 6892 KB Output isn't correct
49 Incorrect 18 ms 6892 KB Output isn't correct
50 Incorrect 24 ms 6892 KB Output isn't correct
51 Incorrect 20 ms 7404 KB Output isn't correct
52 Incorrect 20 ms 7404 KB Output isn't correct
53 Incorrect 26 ms 7404 KB Output isn't correct
54 Incorrect 22 ms 8044 KB Output isn't correct
55 Incorrect 23 ms 8044 KB Output isn't correct
56 Incorrect 30 ms 8044 KB Output isn't correct
57 Incorrect 25 ms 8556 KB Output isn't correct
58 Incorrect 26 ms 8556 KB Output isn't correct
59 Incorrect 35 ms 8556 KB Output isn't correct
60 Incorrect 29 ms 9116 KB Output isn't correct
61 Incorrect 29 ms 9068 KB Output isn't correct
62 Incorrect 40 ms 9068 KB Output isn't correct
63 Incorrect 34 ms 9068 KB Output isn't correct
64 Incorrect 33 ms 9068 KB Output isn't correct
65 Incorrect 33 ms 9068 KB Output isn't correct
66 Incorrect 35 ms 9068 KB Output isn't correct
67 Correct 33 ms 9068 KB Output is correct
68 Incorrect 37 ms 9068 KB Output isn't correct
69 Incorrect 36 ms 9068 KB Output isn't correct
70 Incorrect 36 ms 9068 KB Output isn't correct
71 Incorrect 36 ms 9068 KB Output isn't correct
72 Correct 36 ms 9068 KB Output is correct
73 Correct 42 ms 9324 KB Output is correct
74 Incorrect 34 ms 9452 KB Output isn't correct
75 Incorrect 35 ms 9324 KB Output isn't correct
76 Incorrect 35 ms 9452 KB Output isn't correct
77 Incorrect 37 ms 9324 KB Output isn't correct
78 Correct 35 ms 9324 KB Output is correct
79 Incorrect 41 ms 9324 KB Output isn't correct
80 Incorrect 34 ms 9324 KB Output isn't correct
81 Incorrect 35 ms 9324 KB Output isn't correct
82 Incorrect 35 ms 9324 KB Output isn't correct
83 Incorrect 40 ms 9324 KB Output isn't correct
84 Incorrect 35 ms 9324 KB Output isn't correct
85 Incorrect 35 ms 9452 KB Output isn't correct
86 Incorrect 34 ms 9324 KB Output isn't correct
87 Incorrect 36 ms 9324 KB Output isn't correct
88 Incorrect 34 ms 9196 KB Output isn't correct
89 Incorrect 41 ms 9196 KB Output isn't correct
90 Incorrect 35 ms 9196 KB Output isn't correct
91 Incorrect 35 ms 9196 KB Output isn't correct
92 Incorrect 34 ms 9196 KB Output isn't correct