oj.uz

Submission #492832

# Submission time Handle Problem Language Result Execution time Memory
492832 2021-12-09T07:05:52 Z niloyroot Mecho (IOI09_mecho) C++14
70 / 100
 1000 ms 6628 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<ll>;
using pl = pair<ll,ll>;
#define pb push_back
#define form(m,it) for(auto it=m.begin(); it!=m.end(); it++)
#define forp(i,a,b) for(ll i=a; i<=b; i++)
#define forn(i,a,b) for(ll i=a; i>=b; i--)
#define newl '\n'
#define ff first
#define ss second
const ll mod = 1000000007;

void solve(){
    ll n,s; cin>>n>>s;
    char c[n+1][n+1];
    vector<pl> hives;
    ll dis[n+1][n+1]; forp(i,1,n){forp(j,1,n){dis[i][j]=INT_MAX;}}
    pl start,end;
    forp(i,1,n){
        forp(j,1,n){
            cin>>c[i][j];
            if(c[i][j]=='H'){
                hives.pb({i,j});
                dis[i][j]=0;
            }
            if(c[i][j]=='T'){
                dis[i][j]=0;
            }
            if(c[i][j]=='M'){
                start.ff=i; start.ss=j;
            }
            if(c[i][j]=='D'){
                end.ff=i; end.ss=j;
            }
        }
    }
    bool vis[n+2][n+2];
    queue<pl> q;
    ll i,j;
    for(auto p:hives){
        memset(vis,0,sizeof(vis));
        forp(i,0,n+1){vis[i][0]=1; vis[i][n+1]=1; vis[0][i]=1; vis[n+1][i]=1;}
        q.push(p);
        vis[p.ff][p.ss]=1;
        while(!q.empty()){
            i=q.front().ff; j=q.front().ss;
            q.pop();
            if(!vis[i][j+1] && (c[i][j+1]!='T' && c[i][j+1]!='H' && c[i][j+1]!='D')){
                vis[i][j+1]=1;
                dis[i][j+1]=min(dis[i][j+1],dis[i][j]+1);
                q.push({i,j+1});
            }
            if(!vis[i+1][j] && (c[i+1][j]!='T' && c[i+1][j]!='H' && c[i+1][j]!='D')){
                vis[i+1][j]=1;
                dis[i+1][j]=min(dis[i+1][j],dis[i][j]+1);
                q.push({i+1,j});
            }
            if(!vis[i][j-1] && (c[i][j-1]!='T' && c[i][j-1]!='H' && c[i][j-1]!='D')){
                vis[i][j-1]=1;
                dis[i][j-1]=min(dis[i][j-1],dis[i][j]+1);
                q.push({i,j-1});
            }
            if(!vis[i-1][j] && (c[i-1][j]!='T' && c[i-1][j]!='H' && c[i-1][j]!='D')){
                vis[i-1][j]=1;
                dis[i-1][j]=min(dis[i-1][j],dis[i][j]+1);
                q.push({i-1,j});
            }
        }
    }
    ll l=0,r=dis[start.ff][start.ss]-1,mid,len;
    queue<pair<pl,ll>> qq;
    while(l<r){
        mid=(l+r+1)/2;
        memset(vis,0,sizeof(vis));
        forp(i,0,n+1){vis[i][0]=1; vis[i][n+1]=1; vis[0][i]=1; vis[n+1][i]=1;}
        qq.push({start,0});
        vis[start.ff][start.ss]=1;
        while(!qq.empty()){
            i=qq.front().ff.ff; j=qq.front().ff.ss; len=qq.front().ss;
            qq.pop();
            if(!vis[i][j+1] && dis[i][j+1]>mid + (len+1)/s){
                vis[i][j+1]=1;
                qq.push({{i,j+1},len+1});
            }
            if(!vis[i+1][j] && dis[i+1][j]>mid + (len+1)/s){
                vis[i+1][j]=1;
                qq.push({{i+1,j},len+1});
            }
            if(!vis[i][j-1] && dis[i][j-1]>mid + (len+1)/s){
                vis[i][j-1]=1;
                qq.push({{i,j-1},len+1});
            }
            if(!vis[i-1][j] && dis[i-1][j]>mid + (len+1)/s){
                vis[i-1][j]=1;
                qq.push({{i-1,j},len+1});
            }
        }
        if(vis[end.ff][end.ss]){
            l=mid;
        } else {
            r=mid-1;
        }
    }
    mid=0;
    memset(vis,0,sizeof(vis));
    forp(i,0,n+1){vis[i][0]=1; vis[i][n+1]=1; vis[0][i]=1; vis[n+1][i]=1;}
    qq.push({start,0});
    vis[start.ff][start.ss]=1;
    while(!qq.empty()){
        i=qq.front().ff.ff; j=qq.front().ff.ss; len=qq.front().ss;
        qq.pop();
        if(!vis[i][j+1] && dis[i][j+1]>mid + (len+1)/s){
            vis[i][j+1]=1;
            qq.push({{i,j+1},len+1});
        }
        if(!vis[i+1][j] && dis[i+1][j]>mid + (len+1)/s){
            vis[i+1][j]=1;
            qq.push({{i+1,j},len+1});
        }
        if(!vis[i][j-1] && dis[i][j-1]>mid + (len+1)/s){
            vis[i][j-1]=1;
            qq.push({{i,j-1},len+1});
        }
        if(!vis[i-1][j] && dis[i-1][j]>mid + (len+1)/s){
            vis[i-1][j]=1;
            qq.push({{i-1,j},len+1});
        }
    }
    if(vis[end.ff][end.ss]){
        cout<<l<<newl;
    } else {
        cout<<-1<<newl;
    }
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t=1; //cin>>t;
    while(t--)solve();
}

Subtask #1
70.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Execution timed out 1089 ms 6604 KB Time limit exceeded
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 8 ms 344 KB Output is correct
14 Correct 9 ms 352 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 0 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 5 ms 1484 KB Output is correct
34 Correct 7 ms 1484 KB Output is correct
35 Correct 19 ms 1520 KB Output is correct
36 Correct 7 ms 1868 KB Output is correct
37 Correct 9 ms 1868 KB Output is correct
38 Correct 23 ms 1900 KB Output is correct
39 Correct 8 ms 2300 KB Output is correct
40 Correct 12 ms 2300 KB Output is correct
41 Correct 31 ms 2304 KB Output is correct
42 Correct 9 ms 2764 KB Output is correct
43 Correct 14 ms 2764 KB Output is correct
44 Correct 38 ms 2764 KB Output is correct
45 Correct 12 ms 3232 KB Output is correct
46 Correct 16 ms 3288 KB Output is correct
47 Correct 49 ms 3292 KB Output is correct
48 Correct 17 ms 3788 KB Output is correct
49 Correct 19 ms 3844 KB Output is correct
50 Correct 55 ms 3840 KB Output is correct
51 Correct 16 ms 4428 KB Output is correct
52 Correct 27 ms 4452 KB Output is correct
53 Correct 72 ms 4468 KB Output is correct
54 Correct 19 ms 5020 KB Output is correct
55 Correct 29 ms 5068 KB Output is correct
56 Correct 87 ms 5120 KB Output is correct
57 Correct 22 ms 5708 KB Output is correct
58 Correct 32 ms 5832 KB Output is correct
59 Correct 97 ms 5956 KB Output is correct
60 Correct 24 ms 6588 KB Output is correct
61 Correct 37 ms 6468 KB Output is correct
62 Correct 118 ms 6592 KB Output is correct
63 Execution timed out 1081 ms 6476 KB Time limit exceeded
64 Execution timed out 1093 ms 6476 KB Time limit exceeded
65 Execution timed out 1080 ms 6588 KB Time limit exceeded
66 Execution timed out 1087 ms 6604 KB Time limit exceeded
67 Execution timed out 1075 ms 6492 KB Time limit exceeded
68 Execution timed out 1094 ms 6592 KB Time limit exceeded
69 Execution timed out 1098 ms 6476 KB Time limit exceeded
70 Execution timed out 1094 ms 6584 KB Time limit exceeded
71 Execution timed out 1094 ms 6596 KB Time limit exceeded
72 Execution timed out 1091 ms 6588 KB Time limit exceeded
73 Execution timed out 1088 ms 6604 KB Time limit exceeded
74 Execution timed out 1092 ms 6604 KB Time limit exceeded
75 Execution timed out 1080 ms 6604 KB Time limit exceeded
76 Execution timed out 1091 ms 6604 KB Time limit exceeded
77 Execution timed out 1089 ms 6604 KB Time limit exceeded
78 Execution timed out 1090 ms 6604 KB Time limit exceeded
79 Execution timed out 1091 ms 6604 KB Time limit exceeded
80 Execution timed out 1095 ms 6604 KB Time limit exceeded
81 Execution timed out 1074 ms 6604 KB Time limit exceeded
82 Execution timed out 1092 ms 6604 KB Time limit exceeded
83 Execution timed out 1068 ms 6604 KB Time limit exceeded
84 Execution timed out 1083 ms 6604 KB Time limit exceeded
85 Execution timed out 1091 ms 6604 KB Time limit exceeded
86 Execution timed out 1088 ms 6604 KB Time limit exceeded
87 Execution timed out 1064 ms 6604 KB Time limit exceeded
88 Execution timed out 1095 ms 6628 KB Time limit exceeded
89 Execution timed out 1090 ms 6612 KB Time limit exceeded
90 Execution timed out 1096 ms 6604 KB Time limit exceeded
91 Execution timed out 1094 ms 6604 KB Time limit exceeded
92 Execution timed out 1096 ms 6612 KB Time limit exceeded