oj.uz

Submission #495020

# Submission time Handle Problem Language Result Execution time Memory
495020 2021-12-18T00:56:12 Z Dan4Life Mecho (IOI09_mecho) C++17
100 / 100
 606 ms 15112 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 34 ms 13008 KB Output is correct
2 Correct 37 ms 13004 KB Output is correct
3 Correct 36 ms 13040 KB Output is correct
4 Correct 41 ms 13004 KB Output is correct
5 Correct 43 ms 13024 KB Output is correct
6 Correct 36 ms 13004 KB Output is correct
7 Correct 469 ms 14540 KB Output is correct
8 Correct 42 ms 13124 KB Output is correct
9 Correct 40 ms 13004 KB Output is correct
10 Correct 37 ms 13024 KB Output is correct
11 Correct 36 ms 13004 KB Output is correct
12 Correct 37 ms 13004 KB Output is correct
13 Correct 39 ms 13004 KB Output is correct
14 Correct 40 ms 13004 KB Output is correct
15 Correct 41 ms 13124 KB Output is correct
16 Correct 38 ms 13020 KB Output is correct
17 Correct 38 ms 12888 KB Output is correct
18 Correct 37 ms 13132 KB Output is correct
19 Correct 36 ms 13004 KB Output is correct
20 Correct 38 ms 13004 KB Output is correct
21 Correct 37 ms 13028 KB Output is correct
22 Correct 38 ms 13008 KB Output is correct
23 Correct 37 ms 13004 KB Output is correct
24 Correct 38 ms 13004 KB Output is correct
25 Correct 35 ms 13024 KB Output is correct
26 Correct 38 ms 13004 KB Output is correct
27 Correct 37 ms 13004 KB Output is correct
28 Correct 37 ms 13004 KB Output is correct
29 Correct 39 ms 13028 KB Output is correct
30 Correct 38 ms 13004 KB Output is correct
31 Correct 39 ms 13024 KB Output is correct
32 Correct 38 ms 13020 KB Output is correct
33 Correct 80 ms 13252 KB Output is correct
34 Correct 65 ms 13252 KB Output is correct
35 Correct 99 ms 13264 KB Output is correct
36 Correct 91 ms 13268 KB Output is correct
37 Correct 80 ms 13280 KB Output is correct
38 Correct 123 ms 13268 KB Output is correct
39 Correct 100 ms 13388 KB Output is correct
40 Correct 90 ms 13424 KB Output is correct
41 Correct 135 ms 13428 KB Output is correct
42 Correct 118 ms 13508 KB Output is correct
43 Correct 96 ms 13516 KB Output is correct
44 Correct 165 ms 13416 KB Output is correct
45 Correct 135 ms 13544 KB Output is correct
46 Correct 109 ms 13624 KB Output is correct
47 Correct 199 ms 13644 KB Output is correct
48 Correct 147 ms 13748 KB Output is correct
49 Correct 124 ms 13672 KB Output is correct
50 Correct 220 ms 13760 KB Output is correct
51 Correct 168 ms 13872 KB Output is correct
52 Correct 137 ms 13876 KB Output is correct
53 Correct 264 ms 13880 KB Output is correct
54 Correct 198 ms 14008 KB Output is correct
55 Correct 157 ms 14004 KB Output is correct
56 Correct 292 ms 14148 KB Output is correct
57 Correct 215 ms 14160 KB Output is correct
58 Correct 163 ms 14152 KB Output is correct
59 Correct 329 ms 14164 KB Output is correct
60 Correct 244 ms 14284 KB Output is correct
61 Correct 205 ms 14308 KB Output is correct
62 Correct 389 ms 14324 KB Output is correct
63 Correct 485 ms 14320 KB Output is correct
64 Correct 513 ms 14296 KB Output is correct
65 Correct 515 ms 14404 KB Output is correct
66 Correct 513 ms 14272 KB Output is correct
67 Correct 488 ms 14284 KB Output is correct
68 Correct 562 ms 14384 KB Output is correct
69 Correct 500 ms 14276 KB Output is correct
70 Correct 503 ms 14376 KB Output is correct
71 Correct 515 ms 14328 KB Output is correct
72 Correct 606 ms 14276 KB Output is correct
73 Correct 463 ms 15048 KB Output is correct
74 Correct 530 ms 14960 KB Output is correct
75 Correct 564 ms 14900 KB Output is correct
76 Correct 523 ms 14904 KB Output is correct
77 Correct 565 ms 15112 KB Output is correct
78 Correct 493 ms 14836 KB Output is correct
79 Correct 518 ms 14928 KB Output is correct
80 Correct 517 ms 14840 KB Output is correct
81 Correct 535 ms 14840 KB Output is correct
82 Correct 537 ms 14908 KB Output is correct
83 Correct 504 ms 14660 KB Output is correct
84 Correct 516 ms 14888 KB Output is correct
85 Correct 532 ms 14772 KB Output is correct
86 Correct 520 ms 14760 KB Output is correct
87 Correct 499 ms 14660 KB Output is correct
88 Correct 503 ms 14644 KB Output is correct
89 Correct 524 ms 14648 KB Output is correct
90 Correct 504 ms 14648 KB Output is correct
91 Correct 504 ms 14776 KB Output is correct
92 Correct 514 ms 14648 KB Output is correct