oj.uz

Submission #552748

# Submission time Handle Problem Language Result Execution time Memory
552748 2022-04-23T19:57:47 Z Iwanttobreakfree Mecho (IOI09_mecho) C++
38 / 100
 352 ms 44208 KB 
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
void bfs(queue<int>& q,vector<int>& dist,vector<vector<int>>& g){
    int n=dist.size();
    while(!q.empty()){
        int u=q.front();
        //cout<<u<<' ';
        q.pop();
        for(int v:g[u]){
            if(dist[v]==-1){
                dist[v]=dist[u]+1;
                q.push(v);
            }
        }
    }
}
bool pos(int a,int b,int mid,int s,vector<vector<int>>& g,vector<int>& dist){
    int n=dist.size();
    vector<pair<int,int>> d(n,{-1,-1});
    queue<int> q;
    n=7;
    q.push(a);
    //cout<<mid<<'\n';
    d[a].first=mid;
    d[a].second=-1;
    while(!q.empty()){
        int u=q.front();
        q.pop();
        //cout<<d[u].first<<' ';
        for(int v:g[u]){
            if(d[v].first==-1){
                d[v]=d[u];
                d[v].second++;
                if(d[v].second==s){
                    d[v].second=0;
                    d[v].first++;
                }
                if(d[v].first<dist[v])q.push(v);
            }
        }
    }
    /*for(int i=0;i<n;i++){
        for(int j=0;j<n;j++)cout<<d[i*n+j].first<<' ';
        cout<<'\n';
    }*/
    if(d[b].first==-1)return false;
    return true;
}
int main(){
    int n,s,u,v;
    char c;
    cin>>n>>s;
    vector<vector<int>> g(n*n,vector<int>());
    vector<vector<char>> grid(n,vector<char>(n));
    vector<int> dist(n*n,-1);
    queue<int> q;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cin>>grid[i][j];
            if(grid[i][j]=='T')continue;
            else{
                if(i&&grid[i-1][j]!='T'){
                    g[i*n+j].push_back(i*n+j-n);
                    g[i*n+j-n].push_back(i*n+j);
                }
                if(j&&grid[i][j-1]!='T'){
                    g[i*n+j].push_back(i*n+j-1);
                    g[i*n+j-1].push_back(i*n+j);
                }
                if(grid[i][j]=='D'){
                    v=i*n+j;
                    dist[v]=1e9;
                }
                if(grid[i][j]=='M')u=i*n+j;
                if(grid[i][j]=='H'){
                    q.push(i*n+j);
                    dist[i*n+j]=0;
                }
            }
        }
    }
    bfs(q,dist,g);
    /*for(int i=0;i<n;i++){
        for(int j=0;j<n;j++)cout<<dist[i*n+j]<<' ';
        cout<<'\n';
    }*/
    int l=0,r=1e6,ans=-1;
    while(l<=r){
        int mid=(r+l)/2;
        if(pos(u,v,mid,s,g,dist)){
            l=mid+1;
            ans=mid;
        }
        else r=mid-1;
    }
    cout<<ans;
}

Compilation message

mecho.cpp: In function 'void bfs(std::queue<int>&, std::vector<int>&, std::vector<std::vector<int> >&)':
mecho.cpp:6:9: warning: unused variable 'n' [-Wunused-variable]
    6 |     int n=dist.size();
      |         ^
mecho.cpp: In function 'int main()':
mecho.cpp:53:10: warning: unused variable 'c' [-Wunused-variable]
   53 |     char c;
      |          ^
mecho.cpp:92:15: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   92 |         if(pos(u,v,mid,s,g,dist)){
      |            ~~~^~~~~~~~~~~~~~~~~~
mecho.cpp:92:15: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
38.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Incorrect 0 ms 304 KB Output isn't correct
3 Incorrect 1 ms 304 KB Output isn't correct
4 Incorrect 1 ms 212 KB Output isn't correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 300 KB Output is correct
7 Correct 283 ms 44208 KB Output is correct
8 Incorrect 1 ms 300 KB Output isn't correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Incorrect 1 ms 468 KB Output isn't correct
13 Incorrect 1 ms 340 KB Output isn't correct
14 Correct 2 ms 468 KB Output is correct
15 Incorrect 1 ms 212 KB Output isn't correct
16 Correct 1 ms 212 KB Output is correct
17 Incorrect 1 ms 212 KB Output isn't correct
18 Correct 1 ms 212 KB Output is correct
19 Incorrect 1 ms 340 KB Output isn't correct
20 Correct 1 ms 340 KB Output is correct
21 Incorrect 1 ms 300 KB Output isn't correct
22 Correct 1 ms 340 KB Output is correct
23 Incorrect 2 ms 340 KB Output isn't correct
24 Correct 1 ms 340 KB Output is correct
25 Incorrect 2 ms 468 KB Output isn't correct
26 Correct 1 ms 424 KB Output is correct
27 Incorrect 1 ms 428 KB Output isn't correct
28 Correct 2 ms 468 KB Output is correct
29 Incorrect 1 ms 560 KB Output isn't correct
30 Correct 2 ms 468 KB Output is correct
31 Incorrect 1 ms 596 KB Output isn't correct
32 Correct 1 ms 596 KB Output is correct
33 Incorrect 18 ms 6728 KB Output isn't correct
34 Correct 18 ms 6768 KB Output is correct
35 Correct 46 ms 7728 KB Output is correct
36 Incorrect 22 ms 8680 KB Output isn't correct
37 Correct 30 ms 8680 KB Output is correct
38 Correct 78 ms 9944 KB Output is correct
39 Incorrect 28 ms 10956 KB Output isn't correct
40 Correct 28 ms 10956 KB Output is correct
41 Correct 88 ms 12516 KB Output is correct
42 Incorrect 36 ms 13516 KB Output isn't correct
43 Correct 42 ms 13480 KB Output is correct
44 Correct 119 ms 15456 KB Output is correct
45 Incorrect 42 ms 16272 KB Output isn't correct
46 Correct 43 ms 16440 KB Output is correct
47 Correct 144 ms 18584 KB Output is correct
48 Incorrect 61 ms 19316 KB Output isn't correct
49 Correct 58 ms 19296 KB Output is correct
50 Correct 170 ms 22136 KB Output is correct
51 Incorrect 56 ms 22652 KB Output isn't correct
52 Correct 69 ms 22584 KB Output is correct
53 Correct 210 ms 25928 KB Output is correct
54 Incorrect 68 ms 26132 KB Output isn't correct
55 Correct 69 ms 26228 KB Output is correct
56 Correct 250 ms 30044 KB Output is correct
57 Incorrect 84 ms 30156 KB Output isn't correct
58 Correct 77 ms 30056 KB Output is correct
59 Correct 293 ms 34448 KB Output is correct
60 Incorrect 93 ms 34144 KB Output isn't correct
61 Correct 93 ms 34116 KB Output is correct
62 Correct 352 ms 39128 KB Output is correct
63 Correct 263 ms 36072 KB Output is correct
64 Correct 316 ms 36140 KB Output is correct
65 Correct 299 ms 35984 KB Output is correct
66 Incorrect 283 ms 36080 KB Output isn't correct
67 Correct 256 ms 36020 KB Output is correct
68 Correct 170 ms 36092 KB Output is correct
69 Correct 163 ms 36092 KB Output is correct
70 Correct 162 ms 36100 KB Output is correct
71 Correct 145 ms 36224 KB Output is correct
72 Incorrect 149 ms 36112 KB Output isn't correct
73 Incorrect 210 ms 44176 KB Output isn't correct
74 Correct 241 ms 44096 KB Output is correct
75 Correct 257 ms 44040 KB Output is correct
76 Correct 232 ms 44108 KB Output is correct
77 Correct 266 ms 44060 KB Output is correct
78 Correct 259 ms 44092 KB Output is correct
79 Correct 222 ms 44012 KB Output is correct
80 Correct 247 ms 44108 KB Output is correct
81 Correct 240 ms 44164 KB Output is correct
82 Correct 238 ms 44100 KB Output is correct
83 Correct 282 ms 44024 KB Output is correct
84 Correct 266 ms 44080 KB Output is correct
85 Correct 291 ms 44000 KB Output is correct
86 Correct 253 ms 44012 KB Output is correct
87 Correct 300 ms 44024 KB Output is correct
88 Correct 304 ms 44124 KB Output is correct
89 Correct 296 ms 44040 KB Output is correct
90 Correct 300 ms 43980 KB Output is correct
91 Correct 288 ms 44012 KB Output is correct
92 Correct 318 ms 44016 KB Output is correct