oj.uz

Submission #552770

# Submission time Handle Problem Language Result Execution time Memory
552770 2022-04-23T20:44:58 Z Iwanttobreakfree Mecho (IOI09_mecho) C++
84 / 100
 365 ms 41332 KB 
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
void bfs(queue<int>& q,vector<int>& dist,vector<vector<int>>& g,int b){
    int n=dist.size();
    while(!q.empty()){
        int u=q.front();
        q.pop();
        for(int v:g[u]){
            if(dist[v]==-1&&v!=b){
                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<int> d(n,-1);
    queue<int> q;
    q.push(a);
    //cout<<mid<<'\n';
    if(mid>dist[a])return false;
    d[a]=0;
    while(!q.empty()){
        int u=q.front();
        if(u==b)return true;
        q.pop();
        //cout<<d[u].first<<' ';
        for(int v:g[u]){
            if(d[v]==-1&&(d[u]+1)/s+mid<dist[v]){
                d[v]=d[u]+1;
                q.push(v);
            }
        }
    }
    return false;
}
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,v);
    int l=0,r=1e9,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> >&, int)':
mecho.cpp:6:9: warning: unused variable 'n' [-Wunused-variable]
    6 |     int n=dist.size();
      |         ^
mecho.cpp: In function 'int main()':
mecho.cpp:42:10: warning: unused variable 'c' [-Wunused-variable]
   42 |     char c;
      |          ^
mecho.cpp:77:15: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   77 |         if(pos(u,v,mid,s,g,dist)){
      |            ~~~^~~~~~~~~~~~~~~~~~
mecho.cpp:77:15: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 300 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 342 ms 41328 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 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 1 ms 468 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 300 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 428 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 432 KB Output is correct
31 Correct 2 ms 468 KB Output is correct
32 Correct 1 ms 468 KB Output is correct
33 Correct 17 ms 6228 KB Output is correct
34 Correct 15 ms 6260 KB Output is correct
35 Correct 55 ms 7252 KB Output is correct
36 Correct 21 ms 8140 KB Output is correct
37 Correct 23 ms 8112 KB Output is correct
38 Correct 58 ms 9304 KB Output is correct
39 Correct 25 ms 10216 KB Output is correct
40 Correct 26 ms 10156 KB Output is correct
41 Correct 92 ms 11760 KB Output is correct
42 Correct 30 ms 12536 KB Output is correct
43 Correct 31 ms 12536 KB Output is correct
44 Correct 119 ms 14488 KB Output is correct
45 Correct 40 ms 15052 KB Output is correct
46 Correct 41 ms 15044 KB Output is correct
47 Correct 143 ms 17420 KB Output is correct
48 Correct 49 ms 17836 KB Output is correct
49 Correct 45 ms 17804 KB Output is correct
50 Correct 176 ms 20576 KB Output is correct
51 Correct 52 ms 20808 KB Output is correct
52 Correct 56 ms 20816 KB Output is correct
53 Correct 199 ms 24244 KB Output is correct
54 Correct 65 ms 24028 KB Output is correct
55 Correct 61 ms 24016 KB Output is correct
56 Correct 257 ms 27884 KB Output is correct
57 Correct 71 ms 27640 KB Output is correct
58 Correct 88 ms 27512 KB Output is correct
59 Correct 313 ms 31928 KB Output is correct
60 Correct 81 ms 31244 KB Output is correct
61 Correct 84 ms 31332 KB Output is correct
62 Correct 365 ms 36256 KB Output is correct
63 Correct 238 ms 33208 KB Output is correct
64 Correct 323 ms 33188 KB Output is correct
65 Correct 329 ms 33264 KB Output is correct
66 Correct 248 ms 33208 KB Output is correct
67 Correct 238 ms 33208 KB Output is correct
68 Correct 151 ms 33208 KB Output is correct
69 Correct 164 ms 33212 KB Output is correct
70 Correct 143 ms 33164 KB Output is correct
71 Correct 144 ms 33208 KB Output is correct
72 Incorrect 127 ms 33196 KB Output isn't correct
73 Incorrect 218 ms 41260 KB Output isn't correct
74 Correct 243 ms 41212 KB Output is correct
75 Correct 244 ms 41224 KB Output is correct
76 Correct 260 ms 41160 KB Output is correct
77 Correct 245 ms 41152 KB Output is correct
78 Correct 236 ms 41164 KB Output is correct
79 Correct 207 ms 41332 KB Output is correct
80 Correct 227 ms 41196 KB Output is correct
81 Correct 243 ms 41168 KB Output is correct
82 Correct 204 ms 41172 KB Output is correct
83 Correct 343 ms 41124 KB Output is correct
84 Correct 278 ms 41108 KB Output is correct
85 Correct 323 ms 41156 KB Output is correct
86 Correct 316 ms 41132 KB Output is correct
87 Correct 300 ms 41148 KB Output is correct
88 Correct 335 ms 41184 KB Output is correct
89 Correct 364 ms 41244 KB Output is correct
90 Correct 326 ms 41160 KB Output is correct
91 Correct 268 ms 41172 KB Output is correct
92 Correct 342 ms 41264 KB Output is correct