oj.uz

Submission #777245

# Submission time Handle Problem Language Result Execution time Memory
777245 2023-07-08T20:14:06 Z _ZeyadRafat Mecho (IOI09_mecho) C++14
100 / 100
 472 ms 14420 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
int n, s;
string a[900];
int x[] = {1, -1, 0, 0};
int y[] = {0, 0, 1, -1};
int dis1[900][900], dis2[900][900];
queue<pair<int,int>> Q, Q1;
pair<int,int> st, en;
vector<pair<int,int>> bees;
bool bfs(int mid)
{
    for(int i = 0; i < 900; i++)
        for(int j = 0; j < 900; j++)
            dis1[i][j] = dis2[i][j] = (int)1e18;
    while(!Q.empty()) Q.pop();
    while(!Q1.empty()) Q1.pop();
    for(auto u : bees) Q.push(u), dis2[u.first][u.second]=0;
    Q1.push(st); dis1[st.first][st.second] = 0;
    while(!Q.empty())
    {
        auto cur = Q.front();
        int i = cur.first, j = cur.second;
        if(dis2[i][j]==mid) break; Q.pop();
        for(int k = 0; k < 4; k++)
        {
            int I = i+x[k], J = j+y[k];
            if(I<0 or J<0 or I>=n or J>=n) continue;
            if(a[I][J]!='G') continue;
            if(dis2[I][J]==(int)1e18)
                Q.push({I,J}), dis2[I][J] = dis2[i][j]+1;
        }
    }
    int last = 0, xx = mid;
    while(!Q1.empty())
    {
        xx++;
        while(!Q1.empty())
        {
            auto cur = Q1.front();
            int i = cur.first, j = cur.second;
            if(dis1[i][j]-last==s) break; Q1.pop();
            if(dis2[i][j]!=(int)1e18) continue;
            for(int k = 0; k < 4; k++)
            {
                int I = i+x[k], J = j+y[k];
                if(I<0 or J<0 or I>=n or J>=n) continue;
                if(dis2[I][J]!=(int)1e18) continue;
                if(a[I][J]=='D' and dis1[I][J]==(int)1e18) return true;
                if(a[I][J]!='G') continue;
                if(dis1[I][J]==(int)1e18)
                    Q1.push({I,J}), dis1[I][J] = dis1[i][j]+1;
            }
        }
        while(!Q.empty())
        {
            auto cur = Q.front();
            int i = cur.first, j = cur.second;
            if(dis2[i][j]==xx) break; Q.pop();
            for(int k = 0; k < 4; k++)
            {
                int I = i+x[k], J = j+y[k];
                if(I<0 or J<0 or I>=n or J>=n) continue;
                if(a[I][J]!='G') continue;
                if(dis2[I][J]==(int)1e18)
                    Q.push({I,J}), dis2[I][J] = dis2[i][j]+1;
            }
        }
        last+=s;
    }
    return false;
}

int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n >> s;
    for(int i = 0; i < n; i++)
    {
        cin >> a[i];
        for(int j = 0; j < n; j++)
        {
            if(a[i][j]=='M') st = {i,j}, a[i][j] = 'G';
            else if(a[i][j]=='D') en = {i,j};
            else if(a[i][j]=='H') bees.push_back({i,j});
        }
    }
    int l = -1, r = 1e9;
    while(l<r)
    {
        int mid = (l+r+1)/2; if(mid<0) break;
        if(bfs(mid)) l = mid;
        else r = mid-1;
    }
    cout << l;
}

Compilation message

mecho.cpp: In function 'bool bfs(long long int)':
mecho.cpp:25:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   25 |         if(dis2[i][j]==mid) break; Q.pop();
      |         ^~
mecho.cpp:25:36: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   25 |         if(dis2[i][j]==mid) break; Q.pop();
      |                                    ^
mecho.cpp:43:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   43 |             if(dis1[i][j]-last==s) break; Q1.pop();
      |             ^~
mecho.cpp:43:43: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   43 |             if(dis1[i][j]-last==s) break; Q1.pop();
      |                                           ^~
mecho.cpp:60:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   60 |             if(dis2[i][j]==xx) break; Q.pop();
      |             ^~
mecho.cpp:60:39: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   60 |             if(dis2[i][j]==xx) break; Q.pop();
      |                                       ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 13012 KB Output is correct
2 Correct 22 ms 13028 KB Output is correct
3 Correct 23 ms 13020 KB Output is correct
4 Correct 22 ms 13028 KB Output is correct
5 Correct 24 ms 13064 KB Output is correct
6 Correct 22 ms 13028 KB Output is correct
7 Correct 392 ms 13924 KB Output is correct
8 Correct 21 ms 13032 KB Output is correct
9 Correct 24 ms 13012 KB Output is correct
10 Correct 21 ms 13012 KB Output is correct
11 Correct 22 ms 13012 KB Output is correct
12 Correct 23 ms 13040 KB Output is correct
13 Correct 24 ms 12944 KB Output is correct
14 Correct 30 ms 13044 KB Output is correct
15 Correct 24 ms 13032 KB Output is correct
16 Correct 22 ms 13012 KB Output is correct
17 Correct 22 ms 13012 KB Output is correct
18 Correct 22 ms 13036 KB Output is correct
19 Correct 22 ms 13036 KB Output is correct
20 Correct 23 ms 13040 KB Output is correct
21 Correct 24 ms 12944 KB Output is correct
22 Correct 23 ms 13012 KB Output is correct
23 Correct 22 ms 13012 KB Output is correct
24 Correct 24 ms 13036 KB Output is correct
25 Correct 31 ms 13084 KB Output is correct
26 Correct 23 ms 13044 KB Output is correct
27 Correct 23 ms 13040 KB Output is correct
28 Correct 23 ms 13044 KB Output is correct
29 Correct 23 ms 13012 KB Output is correct
30 Correct 25 ms 13000 KB Output is correct
31 Correct 25 ms 12940 KB Output is correct
32 Correct 25 ms 13040 KB Output is correct
33 Correct 66 ms 13144 KB Output is correct
34 Correct 48 ms 13140 KB Output is correct
35 Correct 65 ms 13148 KB Output is correct
36 Correct 71 ms 13188 KB Output is correct
37 Correct 57 ms 13140 KB Output is correct
38 Correct 89 ms 13192 KB Output is correct
39 Correct 79 ms 13140 KB Output is correct
40 Correct 67 ms 13228 KB Output is correct
41 Correct 131 ms 13236 KB Output is correct
42 Correct 98 ms 13200 KB Output is correct
43 Correct 98 ms 13280 KB Output is correct
44 Correct 111 ms 13300 KB Output is correct
45 Correct 106 ms 13328 KB Output is correct
46 Correct 95 ms 13328 KB Output is correct
47 Correct 174 ms 13360 KB Output is correct
48 Correct 122 ms 13404 KB Output is correct
49 Correct 118 ms 13404 KB Output is correct
50 Correct 156 ms 13412 KB Output is correct
51 Correct 140 ms 13396 KB Output is correct
52 Correct 111 ms 13396 KB Output is correct
53 Correct 171 ms 13476 KB Output is correct
54 Correct 158 ms 13536 KB Output is correct
55 Correct 125 ms 13532 KB Output is correct
56 Correct 202 ms 13560 KB Output is correct
57 Correct 182 ms 13616 KB Output is correct
58 Correct 155 ms 13608 KB Output is correct
59 Correct 223 ms 13628 KB Output is correct
60 Correct 198 ms 13652 KB Output is correct
61 Correct 158 ms 13652 KB Output is correct
62 Correct 295 ms 13704 KB Output is correct
63 Correct 388 ms 13712 KB Output is correct
64 Correct 394 ms 13700 KB Output is correct
65 Correct 411 ms 13700 KB Output is correct
66 Correct 437 ms 13700 KB Output is correct
67 Correct 389 ms 13708 KB Output is correct
68 Correct 431 ms 13760 KB Output is correct
69 Correct 427 ms 13756 KB Output is correct
70 Correct 396 ms 13652 KB Output is correct
71 Correct 461 ms 13768 KB Output is correct
72 Correct 472 ms 13760 KB Output is correct
73 Correct 353 ms 14420 KB Output is correct
74 Correct 414 ms 14272 KB Output is correct
75 Correct 392 ms 14308 KB Output is correct
76 Correct 402 ms 14292 KB Output is correct
77 Correct 395 ms 14420 KB Output is correct
78 Correct 389 ms 14236 KB Output is correct
79 Correct 413 ms 14224 KB Output is correct
80 Correct 393 ms 14164 KB Output is correct
81 Correct 397 ms 14284 KB Output is correct
82 Correct 414 ms 14216 KB Output is correct
83 Correct 419 ms 14136 KB Output is correct
84 Correct 397 ms 14136 KB Output is correct
85 Correct 392 ms 14132 KB Output is correct
86 Correct 396 ms 14140 KB Output is correct
87 Correct 405 ms 14140 KB Output is correct
88 Correct 419 ms 14036 KB Output is correct
89 Correct 469 ms 14036 KB Output is correct
90 Correct 391 ms 14036 KB Output is correct
91 Correct 402 ms 14036 KB Output is correct
92 Correct 427 ms 14156 KB Output is correct