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Submission #784748

# Submission time Handle Problem Language Result Execution time Memory
784748 2023-07-16T13:26:40 Z amine_aroua Mecho (IOI09_mecho) C++17
100 / 100
 169 ms 9300 KB 
#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
using namespace std;
#define vi vector<int>
#define vl vector<long long>
#define vii vector<pair<int,int>>
#define vll vector<pair<long long,long long>>
#define pb push_back
#define ll long long
#define ld long double
#define nl '\n'
#define boost ios::sync_with_stdio(false)
#define mp make_pair
#define se second
#define fi first
#define fore(i, y) for(int i = 0; i < y; i++)
#define forr(i,x,y) for(int i = x;i<=y;i++)
#define forn(i,y,x) for(int i = y; i >= x; i--)
#define all(v) v.begin(),v.end()
#define sz(v) v.size()
#define clr(v,k) memset(v,k,sizeof(v))
#define rall(v) v.rbegin() , v.rend()
#define pii pair<int,int>
#define pll pair<ll , ll>

const ll MOD = 1e9 + 7;
const int INF = 1e9 + 1;

ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (gcd)
ll lcm(ll a , ll b) {return a * (b / gcd(a , b));} // least common multiple (lcm)

// HERE IS THE SOLUTION
const int N = 801;
int n , s;
char grid[N][N];
vi xx = {1 , -1 ,0 , 0};
vi yy = {0 , 0 , 1 , -1};
vector<vi> dBees , dMecho;
int mi , mj , di , dj;
bool notinside(int i , int j)
{
    return !(i<n && j< n && j>=0&&i>=0);
}
vector<vi> modifiedBfs(pii strt , int time)
{
    vector<vi> dist(n , vi(n , INF));
    queue<pii> q;
    q.push(strt);
    dist[strt.fi][strt.se] = 0;
    while(!q.empty())
    {
        pii cur = q.front();
        int i = cur.fi , j = cur.se;
        q.pop();
        fore( k , 4)
        {
            int ni = i + xx[k] , nj = j + yy[k];
            int minutes = (dist[i][j] + 1)/s;
            if(notinside(ni , nj)||grid[ni][nj] == 'T' || grid[ni][nj] == 'H' || grid[ni][nj] == 'D')continue;
            if(dist[ni][nj] > dist[i][j] + 1 && dBees[ni][nj]  > minutes + time )
            {
                dist[ni][nj] = dist[i][j] + 1;
                q.push({ni , nj});
            }
        }
    }
    return dist;

}
vector<vi> bfs(vii cur , bool acc)
{
    vector<vi> dist(n , vi(n , INF));
    queue<pii> q;
    for(auto x : cur)
    {
        dist[x.fi][x.se] = 0;
        q.push(x);
    }
    while(!q.empty())
    {
        pii node = q.front();
        int i  = node.fi , j = node.se;
        q.pop();
        fore(k, 4)
        {
            int ni = i + xx[k] , nj = j + yy[k];
            if(notinside(ni , nj)||grid[ni][nj] == 'T' || grid[ni][nj] == 'H' || grid[ni][nj] == 'D')continue;
            if(dist[ni][nj] > dist[i][j] + 1)
            {
                dist[ni][nj] = dist[i][j] + 1;
                q.push({ni , nj});
            }
        }
    }
    return dist;
}

bool check(int HoneyTime)
{
    if(HoneyTime >= dBees[mi][mj])
        return 0;
    dMecho = modifiedBfs({mi , mj} , HoneyTime);
    fore(k , 4)
    {
        if(!notinside(xx[k] + di , yy[k] + dj) && dMecho[xx[k] + di][yy[k] +dj] != INF)
            return  1;
    }
    return 0;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    boost;
    cin>>n>>s;
    vii MechoV , beesV;
    fore(i , n)
    {
        fore(j , n)
        {
            cin>>grid[i][j];
            char c = grid[i][j];
            if(c == 'M') {
                mi = i , mj = j;
                MechoV.pb({i, j});
            }
            if(c == 'H')
            {
                beesV.pb({i , j});
            }
            if(c == 'D')
                di = i , dj = j;
        }
    }
    dBees = bfs(beesV  ,1);
    int l = -1, r = n*n + 1;
    while(l + 1 < r)
    {
        int mid = (l + r)/2;
        if(check(mid))
        {
            l = mid;
        }
        else
        {
            r = mid;
        }
    }
    cout<<l<<nl;
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 324 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 75 ms 9184 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 328 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 324 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 320 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 328 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 468 KB Output is correct
32 Correct 1 ms 468 KB Output is correct
33 Correct 5 ms 2200 KB Output is correct
34 Correct 5 ms 2192 KB Output is correct
35 Correct 18 ms 2128 KB Output is correct
36 Correct 6 ms 2644 KB Output is correct
37 Correct 6 ms 2644 KB Output is correct
38 Correct 24 ms 2800 KB Output is correct
39 Correct 7 ms 3292 KB Output is correct
40 Correct 8 ms 3292 KB Output is correct
41 Correct 32 ms 3296 KB Output is correct
42 Correct 9 ms 3944 KB Output is correct
43 Correct 10 ms 3964 KB Output is correct
44 Correct 39 ms 3956 KB Output is correct
45 Correct 16 ms 4652 KB Output is correct
46 Correct 11 ms 4656 KB Output is correct
47 Correct 44 ms 4644 KB Output is correct
48 Correct 21 ms 5452 KB Output is correct
49 Correct 13 ms 5464 KB Output is correct
50 Correct 60 ms 5548 KB Output is correct
51 Correct 16 ms 6248 KB Output is correct
52 Correct 16 ms 6252 KB Output is correct
53 Correct 67 ms 6256 KB Output is correct
54 Correct 18 ms 7172 KB Output is correct
55 Correct 22 ms 7192 KB Output is correct
56 Correct 93 ms 7184 KB Output is correct
57 Correct 20 ms 8148 KB Output is correct
58 Correct 21 ms 8136 KB Output is correct
59 Correct 110 ms 8192 KB Output is correct
60 Correct 24 ms 9176 KB Output is correct
61 Correct 23 ms 9172 KB Output is correct
62 Correct 103 ms 9188 KB Output is correct
63 Correct 102 ms 9168 KB Output is correct
64 Correct 169 ms 9300 KB Output is correct
65 Correct 126 ms 9172 KB Output is correct
66 Correct 102 ms 9192 KB Output is correct
67 Correct 101 ms 9204 KB Output is correct
68 Correct 42 ms 9180 KB Output is correct
69 Correct 41 ms 9168 KB Output is correct
70 Correct 32 ms 9212 KB Output is correct
71 Correct 38 ms 9208 KB Output is correct
72 Correct 27 ms 9152 KB Output is correct
73 Correct 28 ms 6608 KB Output is correct
74 Correct 51 ms 9216 KB Output is correct
75 Correct 63 ms 9204 KB Output is correct
76 Correct 67 ms 9204 KB Output is correct
77 Correct 62 ms 9220 KB Output is correct
78 Correct 70 ms 9220 KB Output is correct
79 Correct 44 ms 9212 KB Output is correct
80 Correct 57 ms 9224 KB Output is correct
81 Correct 68 ms 9220 KB Output is correct
82 Correct 55 ms 9212 KB Output is correct
83 Correct 91 ms 9140 KB Output is correct
84 Correct 63 ms 9224 KB Output is correct
85 Correct 70 ms 9216 KB Output is correct
86 Correct 67 ms 9208 KB Output is correct
87 Correct 74 ms 9220 KB Output is correct
88 Correct 76 ms 9204 KB Output is correct
89 Correct 91 ms 9200 KB Output is correct
90 Correct 94 ms 9204 KB Output is correct
91 Correct 87 ms 9208 KB Output is correct
92 Correct 81 ms 9204 KB Output is correct