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Submission #851505

# Submission time Handle Problem Language Result Execution time Memory
851505 2023-09-20T02:45:41 Z abcvuitunggio Mecho (IOI09_mecho) C++17
84 / 100
 151 ms 11784 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'){
                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:31:1: warning: control reaches end of non-void function [-Wreturn-type]
   31 | }
      | ^

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7000 KB Output is correct
2 Correct 3 ms 6744 KB Output is correct
3 Correct 4 ms 6748 KB Output is correct
4 Correct 3 ms 6944 KB Output is correct
5 Correct 4 ms 6744 KB Output is correct
6 Correct 3 ms 6744 KB Output is correct
7 Correct 77 ms 11356 KB Output is correct
8 Correct 4 ms 6744 KB Output is correct
9 Correct 4 ms 6744 KB Output is correct
10 Correct 3 ms 6748 KB Output is correct
11 Correct 3 ms 6744 KB Output is correct
12 Incorrect 4 ms 6744 KB Output isn't correct
13 Incorrect 4 ms 6748 KB Output isn't correct
14 Correct 3 ms 6744 KB Output is correct
15 Correct 4 ms 6744 KB Output is correct
16 Correct 3 ms 7000 KB Output is correct
17 Correct 3 ms 7000 KB Output is correct
18 Correct 4 ms 6744 KB Output is correct
19 Correct 3 ms 6744 KB Output is correct
20 Correct 3 ms 6744 KB Output is correct
21 Correct 4 ms 6744 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 6744 KB Output is correct
25 Correct 3 ms 6744 KB Output is correct
26 Correct 4 ms 6748 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 7000 KB Output is correct
31 Correct 4 ms 6744 KB Output is correct
32 Correct 4 ms 6744 KB Output is correct
33 Correct 9 ms 8792 KB Output is correct
34 Correct 9 ms 8024 KB Output is correct
35 Correct 21 ms 8792 KB Output is correct
36 Correct 9 ms 8792 KB Output is correct
37 Correct 10 ms 8024 KB Output is correct
38 Correct 26 ms 8792 KB Output is correct
39 Correct 10 ms 9052 KB Output is correct
40 Correct 12 ms 8792 KB Output is correct
41 Correct 34 ms 9048 KB Output is correct
42 Correct 11 ms 9048 KB Output is correct
43 Correct 16 ms 8792 KB Output is correct
44 Correct 40 ms 8960 KB Output is correct
45 Correct 13 ms 9048 KB Output is correct
46 Correct 15 ms 9048 KB Output is correct
47 Correct 49 ms 9048 KB Output is correct
48 Correct 16 ms 9560 KB Output is correct
49 Correct 20 ms 9816 KB Output is correct
50 Correct 72 ms 9652 KB Output is correct
51 Correct 18 ms 9816 KB Output is correct
52 Correct 22 ms 9820 KB Output is correct
53 Correct 79 ms 9816 KB Output is correct
54 Correct 20 ms 10328 KB Output is correct
55 Correct 26 ms 10328 KB Output is correct
56 Correct 81 ms 10328 KB Output is correct
57 Correct 24 ms 10800 KB Output is correct
58 Correct 25 ms 10584 KB Output is correct
59 Correct 119 ms 10804 KB Output is correct
60 Correct 24 ms 11096 KB Output is correct
61 Correct 29 ms 11100 KB Output is correct
62 Correct 114 ms 11184 KB Output is correct
63 Correct 97 ms 11096 KB Output is correct
64 Correct 151 ms 11096 KB Output is correct
65 Correct 143 ms 11096 KB Output is correct
66 Correct 104 ms 11096 KB Output is correct
67 Correct 97 ms 11176 KB Output is correct
68 Correct 53 ms 11096 KB Output is correct
69 Correct 52 ms 11096 KB Output is correct
70 Correct 41 ms 11084 KB Output is correct
71 Correct 45 ms 11096 KB Output is correct
72 Incorrect 41 ms 11084 KB Output isn't correct
73 Incorrect 45 ms 11600 KB Output isn't correct
74 Correct 60 ms 11576 KB Output is correct
75 Correct 63 ms 11608 KB Output is correct
76 Correct 70 ms 11608 KB Output is correct
77 Correct 69 ms 11608 KB Output is correct
78 Correct 74 ms 11608 KB Output is correct
79 Correct 57 ms 11608 KB Output is correct
80 Correct 60 ms 11784 KB Output is correct
81 Correct 79 ms 11684 KB Output is correct
82 Correct 58 ms 11672 KB Output is correct
83 Correct 77 ms 11608 KB Output is correct
84 Correct 70 ms 11612 KB Output is correct
85 Correct 66 ms 11608 KB Output is correct
86 Correct 76 ms 11608 KB Output is correct
87 Correct 67 ms 11608 KB Output is correct
88 Correct 81 ms 11504 KB Output is correct
89 Correct 71 ms 11508 KB Output is correct
90 Correct 78 ms 11496 KB Output is correct
91 Correct 95 ms 11504 KB Output is correct
92 Correct 81 ms 11504 KB Output is correct