oj.uz

Submission #577951

# Submission time Handle Problem Language Result Execution time Memory
577951 2022-06-15T14:29:25 Z Iwanttobreakfree Mecho (IOI09_mecho) C++
100 / 100
 340 ms 41676 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+1LL*mid*s<1LL*dist[v]*s){
                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
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 300 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 331 ms 41676 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 260 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 340 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 304 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 2 ms 340 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 2 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 512 KB Output is correct
30 Correct 2 ms 468 KB Output is correct
31 Correct 1 ms 468 KB Output is correct
32 Correct 1 ms 560 KB Output is correct
33 Correct 17 ms 6220 KB Output is correct
34 Correct 16 ms 6260 KB Output is correct
35 Correct 51 ms 7248 KB Output is correct
36 Correct 21 ms 8160 KB Output is correct
37 Correct 20 ms 8124 KB Output is correct
38 Correct 73 ms 9300 KB Output is correct
39 Correct 37 ms 10192 KB Output is correct
40 Correct 31 ms 10212 KB Output is correct
41 Correct 125 ms 11724 KB Output is correct
42 Correct 35 ms 12516 KB Output is correct
43 Correct 34 ms 12496 KB Output is correct
44 Correct 137 ms 14448 KB Output is correct
45 Correct 41 ms 15120 KB Output is correct
46 Correct 43 ms 15052 KB Output is correct
47 Correct 147 ms 17436 KB Output is correct
48 Correct 48 ms 17852 KB Output is correct
49 Correct 49 ms 17928 KB Output is correct
50 Correct 177 ms 20720 KB Output is correct
51 Correct 61 ms 20924 KB Output is correct
52 Correct 55 ms 20888 KB Output is correct
53 Correct 206 ms 24228 KB Output is correct
54 Correct 67 ms 24320 KB Output is correct
55 Correct 62 ms 24248 KB Output is correct
56 Correct 239 ms 28140 KB Output is correct
57 Correct 82 ms 27756 KB Output is correct
58 Correct 73 ms 27848 KB Output is correct
59 Correct 297 ms 32212 KB Output is correct
60 Correct 105 ms 31656 KB Output is correct
61 Correct 88 ms 31640 KB Output is correct
62 Correct 294 ms 36632 KB Output is correct
63 Correct 250 ms 33580 KB Output is correct
64 Correct 337 ms 33556 KB Output is correct
65 Correct 325 ms 33672 KB Output is correct
66 Correct 256 ms 33544 KB Output is correct
67 Correct 232 ms 33580 KB Output is correct
68 Correct 156 ms 33568 KB Output is correct
69 Correct 155 ms 33596 KB Output is correct
70 Correct 145 ms 33576 KB Output is correct
71 Correct 136 ms 33700 KB Output is correct
72 Correct 125 ms 33556 KB Output is correct
73 Correct 212 ms 41660 KB Output is correct
74 Correct 231 ms 41596 KB Output is correct
75 Correct 239 ms 41648 KB Output is correct
76 Correct 250 ms 41596 KB Output is correct
77 Correct 231 ms 41572 KB Output is correct
78 Correct 253 ms 41548 KB Output is correct
79 Correct 214 ms 41576 KB Output is correct
80 Correct 219 ms 41516 KB Output is correct
81 Correct 223 ms 41576 KB Output is correct
82 Correct 235 ms 41548 KB Output is correct
83 Correct 298 ms 41464 KB Output is correct
84 Correct 272 ms 41524 KB Output is correct
85 Correct 288 ms 41520 KB Output is correct
86 Correct 319 ms 41512 KB Output is correct
87 Correct 305 ms 41548 KB Output is correct
88 Correct 321 ms 41516 KB Output is correct
89 Correct 290 ms 41560 KB Output is correct
90 Correct 333 ms 41512 KB Output is correct
91 Correct 294 ms 41608 KB Output is correct
92 Correct 340 ms 41544 KB Output is correct