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Submission #335728

# Submission time Handle Problem Language Result Execution time Memory
335728 2020-12-13T19:23:29 Z DavidDamian Mecho (IOI09_mecho) C++11
53 / 100
 240 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(){
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            bees[i][j]=INT_MAX;
            if(forest[i][j]=='H'){
                Q.push(node(i,j));
                bees[i][j]=0;
            }
        }
    }
    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){
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            dist[i][j]=INT_MAX;
        }
    }
    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-1;
        }
    }
    return k;
}

int main()
{
    cin>>n>>s;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            cin>>forest[i][j];
            if(forest[i][j]=='M'){
                mecho=node(i,j);
            }
            else if(forest[i][j]=='D'){
                home=node(i,j);
            }
        }
    }
    bfsBees();
    int ans=binarySearch();
    cout<<ans<<endl;
    return 0;
}

Subtask #1
53.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 149 ms 8300 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 620 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Incorrect 1 ms 1004 KB Output isn't correct
13 Correct 1 ms 748 KB Output is correct
14 Correct 1 ms 876 KB Output is correct
15 Incorrect 1 ms 492 KB Output isn't correct
16 Incorrect 1 ms 492 KB Output isn't correct
17 Incorrect 1 ms 492 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 620 KB Output isn't correct
22 Incorrect 1 ms 748 KB Output isn't correct
23 Incorrect 1 ms 748 KB Output isn't correct
24 Incorrect 2 ms 876 KB Output isn't correct
25 Incorrect 1 ms 876 KB Output isn't correct
26 Incorrect 2 ms 876 KB Output isn't correct
27 Incorrect 2 ms 876 KB Output isn't correct
28 Incorrect 2 ms 1004 KB Output isn't correct
29 Incorrect 2 ms 1004 KB Output isn't correct
30 Incorrect 2 ms 1004 KB Output isn't correct
31 Incorrect 2 ms 1004 KB Output isn't correct
32 Incorrect 2 ms 1132 KB Output isn't correct
33 Incorrect 57 ms 3436 KB Output isn't correct
34 Incorrect 26 ms 4076 KB Output isn't correct
35 Correct 31 ms 4088 KB Output is correct
36 Incorrect 26 ms 3948 KB Output isn't correct
37 Incorrect 34 ms 4588 KB Output isn't correct
38 Correct 41 ms 4588 KB Output is correct
39 Incorrect 38 ms 4460 KB Output isn't correct
40 Incorrect 48 ms 5100 KB Output isn't correct
41 Correct 50 ms 5100 KB Output is correct
42 Incorrect 41 ms 4972 KB Output isn't correct
43 Incorrect 59 ms 5740 KB Output isn't correct
44 Correct 64 ms 5868 KB Output is correct
45 Incorrect 48 ms 5356 KB Output isn't correct
46 Incorrect 64 ms 6252 KB Output isn't correct
47 Correct 85 ms 6252 KB Output is correct
48 Incorrect 57 ms 5868 KB Output isn't correct
49 Incorrect 75 ms 6764 KB Output isn't correct
50 Correct 104 ms 7020 KB Output is correct
51 Incorrect 68 ms 6380 KB Output isn't correct
52 Incorrect 88 ms 7532 KB Output isn't correct
53 Correct 125 ms 7532 KB Output is correct
54 Incorrect 80 ms 6892 KB Output isn't correct
55 Incorrect 109 ms 7916 KB Output isn't correct
56 Correct 140 ms 8044 KB Output is correct
57 Incorrect 91 ms 7404 KB Output isn't correct
58 Incorrect 123 ms 8556 KB Output isn't correct
59 Correct 163 ms 8556 KB Output is correct
60 Incorrect 105 ms 7916 KB Output isn't correct
61 Incorrect 142 ms 9196 KB Output isn't correct
62 Correct 187 ms 9324 KB Output is correct
63 Correct 149 ms 9288 KB Output is correct
64 Correct 221 ms 9196 KB Output is correct
65 Correct 240 ms 9196 KB Output is correct
66 Correct 170 ms 9196 KB Output is correct
67 Correct 163 ms 9344 KB Output is correct
68 Correct 87 ms 9196 KB Output is correct
69 Correct 84 ms 9196 KB Output is correct
70 Correct 86 ms 9196 KB Output is correct
71 Correct 81 ms 9324 KB Output is correct
72 Correct 69 ms 7916 KB Output is correct
73 Correct 72 ms 9452 KB Output is correct
74 Correct 110 ms 9452 KB Output is correct
75 Correct 118 ms 9452 KB Output is correct
76 Correct 111 ms 9452 KB Output is correct
77 Correct 105 ms 9452 KB Output is correct
78 Correct 122 ms 8172 KB Output is correct
79 Correct 93 ms 7788 KB Output is correct
80 Correct 101 ms 7788 KB Output is correct
81 Correct 117 ms 7916 KB Output is correct
82 Correct 102 ms 7916 KB Output is correct
83 Correct 127 ms 8044 KB Output is correct
84 Correct 122 ms 8044 KB Output is correct
85 Correct 115 ms 8088 KB Output is correct
86 Correct 125 ms 8172 KB Output is correct
87 Correct 129 ms 8172 KB Output is correct
88 Correct 130 ms 8428 KB Output is correct
89 Correct 129 ms 8044 KB Output is correct
90 Correct 132 ms 8044 KB Output is correct
91 Correct 141 ms 8172 KB Output is correct
92 Correct 131 ms 8172 KB Output is correct