oj.uz

Submission #851506

# Submission time Handle Problem Language Result Execution time Memory
851506 2023-09-20T02:51:01 Z abcvuitunggio Mecho (IOI09_mecho) C++17
100 / 100
 154 ms 11856 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;
int n,s,dx[4]={1,-1,0,0},dy[4]={0,0,1,-1},d[801][801],d2[801][801];
string m[801];
queue <pair <int, int>> q;
bool check(int x){
    memset(d2,0,sizeof(d2));
    for (int i=0;i<n;i++)
        for (int j=0;j<n;j++)
            if (m[i][j]=='M'){
                if (d[i][j]<=x*s)
                    return false;
                q.push({i,j});
                d2[i][j]=1;
            }
    while (!q.empty()){
        auto [i,j]=q.front();
        q.pop();
        for (int k=0;k<4;k++){
            int u=i+dx[k],v=j+dy[k];
            if (min(u,v)>=0&&max(u,v)<n)
                if (m[u][v]!='T'&&d[u][v]-x*s>d2[i][j]&&!d2[u][v]){
                    d2[u][v]=d2[i][j]+1;
                    q.push({u,v});
                }
        }
    }
    for (int i=0;i<n;i++)
        for (int j=0;j<n;j++)
            if (m[i][j]=='D')
                return d2[i][j];
}
int32_t main(){
    ios_base::sync_with_stdio(NULL);cin.tie(nullptr);
    cin >> n >> s;
    for (int i=0;i<n;i++){
        cin >> m[i];
        for (int j=0;j<n;j++)
            if (m[i][j]=='H'){
                q.push({i,j});
                d[i][j]=1;
            }
    }
    while (!q.empty()){
        auto [i,j]=q.front();
        q.pop();
        for (int k=0;k<4;k++){
            int u=i+dx[k],v=j+dy[k];
            if (min(u,v)>=0&&max(u,v)<n)
                if (m[u][v]!='T'&&m[u][v]!='D'&&!d[u][v]){
                    d[u][v]=d[i][j]+1;
                    q.push({u,v});
                }
        }
    }
    for (int i=0;i<n;i++)
        for (int j=0;j<n;j++)
            d[i][j]=(d[i][j]?(d[i][j]-1)*s:1e18);
    int l=0,r=1e9,kq=-1;
    while (l<=r){
        int mid=(l+r)>>1;
        if (check(mid)){
            kq=mid;
            l=mid+1;
        }
        else
            r=mid-1;
    }
    cout << kq;
}

Compilation message

mecho.cpp: In function 'bool check(long long int)':
mecho.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type]
   33 | }
      | ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6748 KB Output is correct
2 Correct 3 ms 6748 KB Output is correct
3 Correct 4 ms 6748 KB Output is correct
4 Correct 4 ms 6748 KB Output is correct
5 Correct 3 ms 6748 KB Output is correct
6 Correct 3 ms 6744 KB Output is correct
7 Correct 76 ms 11396 KB Output is correct
8 Correct 3 ms 6636 KB Output is correct
9 Correct 4 ms 6748 KB Output is correct
10 Correct 3 ms 6748 KB Output is correct
11 Correct 4 ms 6788 KB Output is correct
12 Correct 4 ms 6748 KB Output is correct
13 Correct 4 ms 6748 KB Output is correct
14 Correct 4 ms 7000 KB Output is correct
15 Correct 4 ms 6748 KB Output is correct
16 Correct 4 ms 6748 KB Output is correct
17 Correct 3 ms 6748 KB Output is correct
18 Correct 4 ms 6748 KB Output is correct
19 Correct 3 ms 6748 KB Output is correct
20 Correct 3 ms 6748 KB Output is correct
21 Correct 4 ms 6748 KB Output is correct
22 Correct 3 ms 6748 KB Output is correct
23 Correct 4 ms 6748 KB Output is correct
24 Correct 4 ms 6748 KB Output is correct
25 Correct 4 ms 6748 KB Output is correct
26 Correct 4 ms 6944 KB Output is correct
27 Correct 4 ms 6748 KB Output is correct
28 Correct 4 ms 6748 KB Output is correct
29 Correct 4 ms 6744 KB Output is correct
30 Correct 4 ms 6748 KB Output is correct
31 Correct 4 ms 6748 KB Output is correct
32 Correct 4 ms 6744 KB Output is correct
33 Correct 7 ms 8976 KB Output is correct
34 Correct 8 ms 7772 KB Output is correct
35 Correct 20 ms 8984 KB Output is correct
36 Correct 7 ms 8796 KB Output is correct
37 Correct 9 ms 8028 KB Output is correct
38 Correct 23 ms 8796 KB Output is correct
39 Correct 9 ms 9052 KB Output is correct
40 Correct 11 ms 8540 KB Output is correct
41 Correct 33 ms 8916 KB Output is correct
42 Correct 9 ms 9052 KB Output is correct
43 Correct 12 ms 8908 KB Output is correct
44 Correct 40 ms 9048 KB Output is correct
45 Correct 11 ms 9052 KB Output is correct
46 Correct 13 ms 9276 KB Output is correct
47 Correct 50 ms 9052 KB Output is correct
48 Correct 13 ms 9564 KB Output is correct
49 Correct 20 ms 9660 KB Output is correct
50 Correct 63 ms 9812 KB Output is correct
51 Correct 15 ms 9820 KB Output is correct
52 Correct 19 ms 9816 KB Output is correct
53 Correct 96 ms 10020 KB Output is correct
54 Correct 18 ms 10332 KB Output is correct
55 Correct 23 ms 10332 KB Output is correct
56 Correct 77 ms 10332 KB Output is correct
57 Correct 18 ms 10840 KB Output is correct
58 Correct 21 ms 10588 KB Output is correct
59 Correct 112 ms 10800 KB Output is correct
60 Correct 18 ms 11096 KB Output is correct
61 Correct 26 ms 11100 KB Output is correct
62 Correct 140 ms 11188 KB Output is correct
63 Correct 97 ms 11180 KB Output is correct
64 Correct 154 ms 11188 KB Output is correct
65 Correct 145 ms 11180 KB Output is correct
66 Correct 111 ms 11100 KB Output is correct
67 Correct 98 ms 11096 KB Output is correct
68 Correct 46 ms 11100 KB Output is correct
69 Correct 50 ms 11240 KB Output is correct
70 Correct 37 ms 11096 KB Output is correct
71 Correct 38 ms 11252 KB Output is correct
72 Correct 35 ms 11104 KB Output is correct
73 Correct 33 ms 11612 KB Output is correct
74 Correct 58 ms 11704 KB Output is correct
75 Correct 60 ms 11612 KB Output is correct
76 Correct 49 ms 11680 KB Output is correct
77 Correct 54 ms 11608 KB Output is correct
78 Correct 64 ms 11664 KB Output is correct
79 Correct 54 ms 11612 KB Output is correct
80 Correct 59 ms 11600 KB Output is correct
81 Correct 66 ms 11672 KB Output is correct
82 Correct 52 ms 11664 KB Output is correct
83 Correct 74 ms 11600 KB Output is correct
84 Correct 67 ms 11856 KB Output is correct
85 Correct 54 ms 11612 KB Output is correct
86 Correct 60 ms 11608 KB Output is correct
87 Correct 62 ms 11612 KB Output is correct
88 Correct 66 ms 11356 KB Output is correct
89 Correct 83 ms 11608 KB Output is correct
90 Correct 70 ms 11496 KB Output is correct
91 Correct 78 ms 11500 KB Output is correct
92 Correct 76 ms 11608 KB Output is correct