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Submission #255346

# Submission time Handle Problem Language Result Execution time Memory
255346 2020-07-31T18:05:31 Z DavidDamian Mecho (IOI09_mecho) C++11
100 / 100
 229 ms 12024 KB 
#include <bits/stdc++.h>
using namespace std;
struct node
{
    int i,j;
    node(){}
    node(int i,int j) : i(i),j(j){}
};
int n,s;
char board[805][805];
int bee[805][805];
int d[805][805];
int color[805][805];
int fuel[805][805];
int dx[4]={1,-1,0,0};
int dy[4]={0,0,1,-1};
queue<node> Q;
node start,finish;
void bfsBee()
{
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            bee[i][j]=INT_MAX;
            if(board[i][j]=='H'){
                Q.push(node(i,j));
                bee[i][j]=0;
                color[i][j]=-1;
            }
        }
    }
    while(Q.size()){
        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(board[i][j]=='T' || board[i][j]=='D') continue;
            if(color[i][j]==0){
                color[i][j]=-1;
                Q.push(node(i,j));
                bee[i][j]=bee[u.i][u.j]+1;
            }
        }
    }
}
void bfsMecho(int init_d)
{
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            d[i][j]=INT_MAX;
            color[i][j]=0;
        }
    }
    if(bee[start.i][start.j]<=init_d-1) return;
    d[start.i][start.j]=init_d-1;
    fuel[start.i][start.j]=0;
    color[start.i][start.j]=init_d;
    Q.push(start);
    while(Q.size()){
        node u=Q.front();Q.pop();
        if(d[u.i][u.j]==bee[u.i][u.j] && fuel[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(board[i][j]=='T') continue;
            if(color[i][j]!=init_d){
                d[i][j]=(fuel[u.i][u.j]>0)? d[u.i][u.j] : d[u.i][u.j]+1;
                if(bee[i][j]<d[i][j]) continue;
                fuel[i][j]=(fuel[u.i][u.j]>0)? fuel[u.i][u.j]-1 : s-1;
                color[i][j]=init_d;
                Q.push(node(i,j));
            }
        }
    }
}
bool valid(int k)
{
    bfsMecho(k);
    return d[finish.i][finish.j]!=INT_MAX;
}
int binarySearch()
{
    int k=0;
    for(int b=10000;b>=1;b/=2){
        while(valid(k+b)) k+=b;
    }
    return k-1;
}
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>>board[i][j];
            if(board[i][j]=='M') start={i,j};
            if(board[i][j]=='D') finish={i,j};
        }
    }
    bfsBee();
    int maximum=binarySearch();
    cout<<maximum<<'\n';
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Correct 0 ms 512 KB Output is correct
7 Correct 152 ms 10872 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 512 KB Output is correct
10 Correct 1 ms 512 KB Output is correct
11 Correct 1 ms 512 KB Output is correct
12 Correct 1 ms 1152 KB Output is correct
13 Correct 1 ms 896 KB Output is correct
14 Correct 1 ms 1024 KB Output is correct
15 Correct 0 ms 512 KB Output is correct
16 Correct 1 ms 512 KB Output is correct
17 Correct 1 ms 640 KB Output is correct
18 Correct 1 ms 640 KB Output is correct
19 Correct 1 ms 640 KB Output is correct
20 Correct 1 ms 640 KB Output is correct
21 Correct 1 ms 768 KB Output is correct
22 Correct 1 ms 768 KB Output is correct
23 Correct 1 ms 896 KB Output is correct
24 Correct 1 ms 1024 KB Output is correct
25 Correct 1 ms 1024 KB Output is correct
26 Correct 1 ms 1024 KB Output is correct
27 Correct 1 ms 1024 KB Output is correct
28 Correct 1 ms 1152 KB Output is correct
29 Correct 1 ms 1152 KB Output is correct
30 Correct 1 ms 1152 KB Output is correct
31 Correct 1 ms 1152 KB Output is correct
32 Correct 1 ms 1152 KB Output is correct
33 Correct 11 ms 4480 KB Output is correct
34 Correct 10 ms 4864 KB Output is correct
35 Correct 29 ms 5152 KB Output is correct
36 Correct 17 ms 5248 KB Output is correct
37 Correct 14 ms 5504 KB Output is correct
38 Correct 39 ms 5888 KB Output is correct
39 Correct 29 ms 5760 KB Output is correct
40 Correct 29 ms 6272 KB Output is correct
41 Correct 57 ms 6528 KB Output is correct
42 Correct 28 ms 6400 KB Output is correct
43 Correct 30 ms 7040 KB Output is correct
44 Correct 68 ms 7296 KB Output is correct
45 Correct 35 ms 7040 KB Output is correct
46 Correct 31 ms 7808 KB Output is correct
47 Correct 77 ms 8064 KB Output is correct
48 Correct 45 ms 7808 KB Output is correct
49 Correct 40 ms 8568 KB Output is correct
50 Correct 100 ms 8704 KB Output is correct
51 Correct 62 ms 8568 KB Output is correct
52 Correct 52 ms 9216 KB Output is correct
53 Correct 126 ms 9472 KB Output is correct
54 Correct 79 ms 9172 KB Output is correct
55 Correct 63 ms 10104 KB Output is correct
56 Correct 150 ms 10232 KB Output is correct
57 Correct 94 ms 9848 KB Output is correct
58 Correct 76 ms 10872 KB Output is correct
59 Correct 169 ms 11000 KB Output is correct
60 Correct 114 ms 10488 KB Output is correct
61 Correct 93 ms 11520 KB Output is correct
62 Correct 195 ms 11716 KB Output is correct
63 Correct 139 ms 11640 KB Output is correct
64 Correct 229 ms 11768 KB Output is correct
65 Correct 209 ms 11896 KB Output is correct
66 Correct 179 ms 11640 KB Output is correct
67 Correct 137 ms 11768 KB Output is correct
68 Correct 70 ms 11768 KB Output is correct
69 Correct 58 ms 11768 KB Output is correct
70 Correct 59 ms 11768 KB Output is correct
71 Correct 50 ms 11768 KB Output is correct
72 Correct 47 ms 9848 KB Output is correct
73 Correct 49 ms 11896 KB Output is correct
74 Correct 90 ms 12024 KB Output is correct
75 Correct 103 ms 11896 KB Output is correct
76 Correct 102 ms 11972 KB Output is correct
77 Correct 106 ms 11896 KB Output is correct
78 Correct 101 ms 10616 KB Output is correct
79 Correct 82 ms 10236 KB Output is correct
80 Correct 97 ms 10364 KB Output is correct
81 Correct 109 ms 10616 KB Output is correct
82 Correct 91 ms 10484 KB Output is correct
83 Correct 111 ms 10808 KB Output is correct
84 Correct 113 ms 10556 KB Output is correct
85 Correct 113 ms 10732 KB Output is correct
86 Correct 127 ms 10632 KB Output is correct
87 Correct 132 ms 10744 KB Output is correct
88 Correct 117 ms 10772 KB Output is correct
89 Correct 124 ms 10616 KB Output is correct
90 Correct 146 ms 10876 KB Output is correct
91 Correct 150 ms 10744 KB Output is correct
92 Correct 132 ms 10744 KB Output is correct