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Submission #598324

# Submission time Handle Problem Language Result Execution time Memory
598324 2022-07-18T04:25:11 Z Hanksburger Mecho (IOI09_mecho) C++17
84 / 100
 371 ms 39284 KB 
#include <bits/stdc++.h>
using namespace std;
vector<int> adj[640005], bee;
queue<pair<int, int> > qq;
char a[640005];
bool b[640005];
int d[640005];
queue<int> q;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, p, s, e, l=-1, r=640000;
    cin >> n >> p;
    for (int i=0; i<n*n; i++)
    {
        cin >> a[i];
        if (a[i]=='M')
            s=i;
        else if (a[i]=='D')
            e=i;
        else if (a[i]=='H')
            bee.push_back(i);
        if (a[i]!='T')
        {
            a[i]='G';
            if (i>=n && a[i-n]=='G')
            {
                adj[i].push_back(i-n);
                adj[i-n].push_back(i);
            }
            if (i%n && a[i-1]=='G')
            {
                adj[i].push_back(i-1);
                adj[i-1].push_back(i);
            }
        }
    }
    for (int u:bee)
    {
        q.push(u);
        b[u]=1;
    }
    while (!q.empty())
    {
        int u=q.front();
        q.pop();
        for (int v:adj[u])
        {
            if (!b[v])
            {
                d[v]=d[u]+1;
                q.push(v);
                b[v]=1;
            }
        }
    }
    while (l<r)
    {
        int m=(l+r+1)/2;
        for (int i=0; i<n*n; i++)
            b[i]=0;
        qq.push({s, 0});
        b[s]=1;
        bool ok=0;
        while (!qq.empty())
        {
            int u=qq.front().first, w=qq.front().second;
            qq.pop();
            for (int v:adj[u])
            {
                if (v==e)
                {
                    ok=1;
                    break;
                }
                if (!b[v] && w+1<(d[v]-m)*p)
                {
                    qq.push({v, w+1});
                    b[v]=1;
                }
            }
            if (ok)
                while (!qq.empty())
                    qq.pop();
        }
        if (ok)
            l=m;
        else
            r=m-1;
    }
    cout << l;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:65:13: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   65 |         b[s]=1;
      |         ~~~~^~
mecho.cpp:73:17: warning: 'e' may be used uninitialized in this function [-Wmaybe-uninitialized]
   73 |                 if (v==e)
      |                 ^~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15316 KB Output is correct
2 Correct 8 ms 15316 KB Output is correct
3 Correct 8 ms 15316 KB Output is correct
4 Correct 8 ms 15316 KB Output is correct
5 Correct 8 ms 15316 KB Output is correct
6 Correct 8 ms 15316 KB Output is correct
7 Correct 325 ms 39284 KB Output is correct
8 Correct 8 ms 15316 KB Output is correct
9 Correct 8 ms 15316 KB Output is correct
10 Correct 7 ms 15320 KB Output is correct
11 Correct 8 ms 15296 KB Output is correct
12 Incorrect 9 ms 15444 KB Output isn't correct
13 Incorrect 8 ms 15444 KB Output isn't correct
14 Correct 8 ms 15380 KB Output is correct
15 Correct 8 ms 15316 KB Output is correct
16 Correct 8 ms 15316 KB Output is correct
17 Correct 8 ms 15316 KB Output is correct
18 Correct 8 ms 15316 KB Output is correct
19 Correct 8 ms 15316 KB Output is correct
20 Correct 8 ms 15316 KB Output is correct
21 Correct 8 ms 15380 KB Output is correct
22 Correct 8 ms 15316 KB Output is correct
23 Correct 8 ms 15316 KB Output is correct
24 Correct 8 ms 15316 KB Output is correct
25 Correct 8 ms 15444 KB Output is correct
26 Correct 9 ms 15344 KB Output is correct
27 Correct 9 ms 15344 KB Output is correct
28 Correct 8 ms 15444 KB Output is correct
29 Correct 10 ms 15468 KB Output is correct
30 Correct 8 ms 15444 KB Output is correct
31 Correct 8 ms 15444 KB Output is correct
32 Correct 8 ms 15444 KB Output is correct
33 Correct 16 ms 18004 KB Output is correct
34 Correct 16 ms 17992 KB Output is correct
35 Correct 43 ms 18900 KB Output is correct
36 Correct 18 ms 18764 KB Output is correct
37 Correct 19 ms 18768 KB Output is correct
38 Correct 74 ms 19984 KB Output is correct
39 Correct 21 ms 19704 KB Output is correct
40 Correct 21 ms 19692 KB Output is correct
41 Correct 91 ms 21204 KB Output is correct
42 Correct 23 ms 20692 KB Output is correct
43 Correct 24 ms 20644 KB Output is correct
44 Correct 119 ms 22592 KB Output is correct
45 Correct 26 ms 21836 KB Output is correct
46 Correct 27 ms 21824 KB Output is correct
47 Correct 160 ms 24220 KB Output is correct
48 Correct 31 ms 23060 KB Output is correct
49 Correct 30 ms 23072 KB Output is correct
50 Correct 178 ms 25904 KB Output is correct
51 Correct 33 ms 24456 KB Output is correct
52 Correct 34 ms 24396 KB Output is correct
53 Correct 244 ms 27804 KB Output is correct
54 Correct 39 ms 25804 KB Output is correct
55 Correct 39 ms 25812 KB Output is correct
56 Correct 314 ms 29720 KB Output is correct
57 Correct 42 ms 27428 KB Output is correct
58 Correct 43 ms 27416 KB Output is correct
59 Correct 338 ms 31844 KB Output is correct
60 Correct 45 ms 29060 KB Output is correct
61 Correct 48 ms 29000 KB Output is correct
62 Correct 371 ms 34100 KB Output is correct
63 Correct 206 ms 31052 KB Output is correct
64 Correct 343 ms 31172 KB Output is correct
65 Correct 270 ms 31056 KB Output is correct
66 Correct 233 ms 31052 KB Output is correct
67 Correct 222 ms 31052 KB Output is correct
68 Correct 128 ms 31152 KB Output is correct
69 Correct 120 ms 31052 KB Output is correct
70 Correct 107 ms 31052 KB Output is correct
71 Correct 108 ms 31076 KB Output is correct
72 Incorrect 96 ms 30980 KB Output isn't correct
73 Incorrect 193 ms 39248 KB Output isn't correct
74 Correct 209 ms 38988 KB Output is correct
75 Correct 236 ms 39104 KB Output is correct
76 Correct 219 ms 39144 KB Output is correct
77 Correct 233 ms 39088 KB Output is correct
78 Correct 253 ms 39044 KB Output is correct
79 Correct 179 ms 39224 KB Output is correct
80 Correct 207 ms 38960 KB Output is correct
81 Correct 234 ms 39080 KB Output is correct
82 Correct 201 ms 39084 KB Output is correct
83 Correct 292 ms 38928 KB Output is correct
84 Correct 262 ms 38976 KB Output is correct
85 Correct 316 ms 39024 KB Output is correct
86 Correct 284 ms 39008 KB Output is correct
87 Correct 299 ms 39116 KB Output is correct
88 Correct 301 ms 39036 KB Output is correct
89 Correct 310 ms 38988 KB Output is correct
90 Correct 308 ms 39032 KB Output is correct
91 Correct 304 ms 38996 KB Output is correct
92 Correct 334 ms 39036 KB Output is correct