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Submission #335501

# Submission time Handle Problem Language Result Execution time Memory
335501 2020-12-12T21:11:53 Z DavidDamian Mecho (IOI09_mecho) C++11
71 / 100
 253 ms 8960 KB 
#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
char forest[805][805];
int n,s;
queue<pii> Q;
int timeBees[805][805];
int dx[4]={1,-1,0,0};
int dy[4]{0,0,1,-1};
void bfsBees(vector<pii> source){
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            timeBees[i][j]=INT_MAX;
        }
    }
    for(pii u: source){
        timeBees[u.first][u.second]=0;
        Q.push(u);
    }
    while(!Q.empty()){
        pii u=Q.front();
        Q.pop();
        for(int mov=0;mov<4;mov++){
            int i=u.first+dx[mov];
            int j=u.second+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(timeBees[i][j]==INT_MAX){
                timeBees[i][j]=timeBees[u.first][u.second]+1;
                Q.push(pii(i,j));
            }
        }
    }
}
pii start;
pii goal;
int dist[805][805];
int fuel[805][805];
bool valid(int moment){
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            dist[i][j]=INT_MAX;
        }
    }
    dist[start.first][start.second]=moment-1;
    fuel[start.first][start.second]=0;
    Q.push(start);
    while(!Q.empty()){
        pii u=Q.front();
        Q.pop();
        if(dist[u.first][u.second]==timeBees[u.first][u.second] && fuel[u.first][u.second]==0) continue;
        for(int mov=0;mov<4;mov++){
            int i=u.first+dx[mov];
            int j=u.second+dy[mov];
            if(i<1 || i>n) continue;
            if(j<1 || j>n) continue;
            if(forest[i][j]=='T' || forest[i][j]=='H') continue;
            int nxt_dist=dist[u.first][u.second];
            if(fuel[u.first][u.second]==0)
                nxt_dist++;
            if(timeBees[i][j]<nxt_dist) continue;
            if(dist[i][j]==INT_MAX){
                dist[i][j]=nxt_dist;
                fuel[i][j]=(fuel[u.first][u.second]>0)? fuel[u.first][u.second]-1 : s-1;
                Q.push(pii(i,j));
            }
        }
    }
    return dist[goal.first][goal.second]!=INT_MAX;
}
int binarySearch(){
    int L=1,R=10000;
    int mid=(L+R)/2;
    int ans=0;
    while(L<=R){
        mid=(L+R)/2;
        if(valid(mid)){
            ans=mid;
            L=mid+1;
        }
        else{
            R=mid-1;
        }
    }
    return ans-1;
}
int main()
{
    vector<pii> beeSource;
    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]=='H'){
                beeSource.push_back(pii(i,j));
            }
            else if(forest[i][j]=='M'){
                start=pii(i,j);
            }
            else if(forest[i][j]=='D'){
                goal=pii(i,j);
            }
        }
    }
    bfsBees(beeSource);
    int last=binarySearch();
    cout<<last<<'\n';
    return 0;
}

Subtask #1
71.0 / 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 0 ms 364 KB Output is correct
4 Correct 0 ms 364 KB Output is correct
5 Correct 0 ms 364 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 137 ms 7660 KB Output is correct
8 Correct 1 ms 620 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Incorrect 1 ms 748 KB Output isn't correct
13 Correct 1 ms 748 KB Output is correct
14 Correct 1 ms 876 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 492 KB Output is correct
17 Correct 1 ms 492 KB Output is correct
18 Correct 1 ms 492 KB Output is correct
19 Correct 1 ms 620 KB Output is correct
20 Correct 1 ms 620 KB Output is correct
21 Correct 1 ms 620 KB Output is correct
22 Correct 1 ms 620 KB Output is correct
23 Correct 1 ms 748 KB Output is correct
24 Correct 1 ms 748 KB Output is correct
25 Correct 1 ms 748 KB Output is correct
26 Correct 1 ms 876 KB Output is correct
27 Correct 1 ms 876 KB Output is correct
28 Correct 1 ms 876 KB Output is correct
29 Correct 1 ms 876 KB Output is correct
30 Correct 1 ms 876 KB Output is correct
31 Correct 1 ms 876 KB Output is correct
32 Correct 1 ms 876 KB Output is correct
33 Incorrect 21 ms 3308 KB Output isn't correct
34 Incorrect 26 ms 3692 KB Output isn't correct
35 Correct 32 ms 3948 KB Output is correct
36 Incorrect 28 ms 3820 KB Output isn't correct
37 Incorrect 35 ms 4332 KB Output isn't correct
38 Correct 42 ms 4460 KB Output is correct
39 Incorrect 35 ms 4204 KB Output isn't correct
40 Incorrect 46 ms 4844 KB Output isn't correct
41 Correct 60 ms 4972 KB Output is correct
42 Incorrect 44 ms 4588 KB Output isn't correct
43 Incorrect 58 ms 5356 KB Output isn't correct
44 Correct 67 ms 5484 KB Output is correct
45 Incorrect 54 ms 5060 KB Output isn't correct
46 Incorrect 71 ms 5908 KB Output isn't correct
47 Correct 86 ms 5996 KB Output is correct
48 Incorrect 69 ms 5612 KB Output isn't correct
49 Incorrect 85 ms 6380 KB Output isn't correct
50 Correct 100 ms 6508 KB Output is correct
51 Incorrect 83 ms 6124 KB Output isn't correct
52 Incorrect 101 ms 6892 KB Output isn't correct
53 Correct 127 ms 7020 KB Output is correct
54 Incorrect 86 ms 6380 KB Output isn't correct
55 Incorrect 118 ms 7404 KB Output isn't correct
56 Correct 148 ms 7532 KB Output is correct
57 Incorrect 99 ms 6892 KB Output isn't correct
58 Incorrect 136 ms 7916 KB Output isn't correct
59 Correct 178 ms 8044 KB Output is correct
60 Incorrect 111 ms 7304 KB Output isn't correct
61 Incorrect 159 ms 8428 KB Output isn't correct
62 Correct 195 ms 8556 KB Output is correct
63 Correct 163 ms 8556 KB Output is correct
64 Correct 253 ms 8592 KB Output is correct
65 Correct 200 ms 8556 KB Output is correct
66 Correct 171 ms 8556 KB Output is correct
67 Correct 173 ms 8684 KB Output is correct
68 Correct 87 ms 8556 KB Output is correct
69 Correct 87 ms 8556 KB Output is correct
70 Correct 75 ms 8556 KB Output is correct
71 Correct 80 ms 8556 KB Output is correct
72 Correct 66 ms 6636 KB Output is correct
73 Correct 72 ms 8812 KB Output is correct
74 Correct 102 ms 8812 KB Output is correct
75 Correct 121 ms 8812 KB Output is correct
76 Correct 108 ms 8960 KB Output is correct
77 Correct 110 ms 8812 KB Output is correct
78 Correct 122 ms 7532 KB Output is correct
79 Correct 99 ms 7276 KB Output is correct
80 Correct 102 ms 7404 KB Output is correct
81 Correct 113 ms 7404 KB Output is correct
82 Correct 106 ms 7276 KB Output is correct
83 Correct 131 ms 7660 KB Output is correct
84 Correct 121 ms 7532 KB Output is correct
85 Correct 128 ms 7488 KB Output is correct
86 Correct 124 ms 7404 KB Output is correct
87 Correct 129 ms 7404 KB Output is correct
88 Correct 133 ms 7660 KB Output is correct
89 Correct 132 ms 7532 KB Output is correct
90 Correct 135 ms 7532 KB Output is correct
91 Correct 133 ms 7532 KB Output is correct
92 Correct 143 ms 7616 KB Output is correct