oj.uz

Submission #953282

# Submission time Handle Problem Language Result Execution time Memory
953282 2024-03-25T19:15:38 Z sandry24 Mecho (IOI09_mecho) C++17
73 / 100
 613 ms 7108 KB 
#include <bits/stdc++.h>
using namespace std;
 
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pi;
#define pb push_back
#define mp make_pair
#define f first
#define s second

int n, s;
pi st, en;
char a[805][805];
bool visited[805][805];
int dist[805][805];
int dist2[805][805];
int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, 1, 0, -1};

bool is_possible(pi temp, int type, int time){
    if(temp.f <= 0 || temp.s <= 0 || temp.f > n || temp.s > n)
        return false;
    else if(visited[temp.f][temp.s] || a[temp.f][temp.s] == 'T' || a[temp.f][temp.s] == 'H')
        return false;
    if(type && dist[temp.f][temp.s] <= time)
        return false;
    return true;
}

void bfs(vector<pi> b, int type, int time){ //time = 0 if bees
    queue<pi> q;
    for(auto start : b){
        q.push(start);
        visited[start.f][start.s] = 1;
        if(!type)
            dist[start.f][start.s] = 0;
        else
            dist2[start.f][start.s] = time;
    }
    while(!q.empty()){
        pi current = q.front();
        q.pop();
        for(int i = 0; i < 4; i++){
            pi temp = {current.f + dx[i], current.s + dy[i]};
            if(is_possible(temp, type, dist2[current.f][current.s] + 1)){
                q.push(temp);
                visited[temp.f][temp.s] = 1;
                if(!type)
                    dist[temp.f][temp.s] = dist[current.f][current.s] + 1;
                else 
                    dist2[temp.f][temp.s] = dist2[current.f][current.s] + 1;
            }
        }
    }
}

void clear(){
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            dist2[i][j] = 0;
            visited[i][j] = 0;
        }
    }
}

void solve(){
    cin >> n >> s;
    vector<pi> bees;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            cin >> a[i][j];
            if(a[i][j] == 'H')
                bees.pb({i, j});
            if(a[i][j] == 'M')
                st = {i, j};
            if(a[i][j] == 'D')
                en = {i, j};
        }
    }
    bfs(bees, 0, 0);
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++)
            dist[i][j] = s * dist[i][j]; //1 step for bees = s for bear
    if(!visited[st.f][st.s]){ //bees cant reach bear
        cout << -1 << '\n';
        return;
    }
    //binary search for how much time to eat honey
    int current = -1;
    for(int i = 1e9; i > 0; i /= 2){
        while(true){
            clear();
            bfs({st}, 1, current+i);
            if(visited[en.f][en.s])
                current += i;
            else
                break;
        }
    }
    if(current == -1){ //bear cant reach home
        cout << -1 << '\n';
        return;
    }
    cout << current / s << '\n';
}   
 
int main(){
    //freopen("infasuratoare.in", "r", stdin);
    //freopen("infasuratoare.out", "w", stdout);
    ios::sync_with_stdio(0); cin.tie(0);
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
}

Subtask #1
73.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Incorrect 1 ms 4444 KB Output isn't correct
3 Correct 1 ms 4444 KB Output is correct
4 Incorrect 1 ms 4444 KB Output isn't correct
5 Correct 1 ms 4440 KB Output is correct
6 Incorrect 1 ms 4444 KB Output isn't correct
7 Incorrect 309 ms 6900 KB Output isn't correct
8 Correct 1 ms 4696 KB Output is correct
9 Correct 1 ms 4440 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Incorrect 1 ms 4700 KB Output isn't correct
13 Incorrect 1 ms 4564 KB Output isn't correct
14 Correct 1 ms 4700 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4440 KB Output is correct
17 Correct 1 ms 4440 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1 ms 4440 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct
21 Correct 1 ms 4444 KB Output is correct
22 Correct 1 ms 4444 KB Output is correct
23 Correct 1 ms 4700 KB Output is correct
24 Correct 1 ms 4700 KB Output is correct
25 Correct 1 ms 4700 KB Output is correct
26 Correct 1 ms 4700 KB Output is correct
27 Correct 1 ms 4700 KB Output is correct
28 Correct 1 ms 4700 KB Output is correct
29 Correct 2 ms 4700 KB Output is correct
30 Correct 2 ms 4700 KB Output is correct
31 Correct 1 ms 4700 KB Output is correct
32 Correct 1 ms 4700 KB Output is correct
33 Correct 8 ms 5464 KB Output is correct
34 Correct 8 ms 5468 KB Output is correct
35 Correct 102 ms 5468 KB Output is correct
36 Correct 8 ms 5724 KB Output is correct
37 Correct 8 ms 5724 KB Output is correct
38 Correct 140 ms 5808 KB Output is correct
39 Correct 13 ms 5976 KB Output is correct
40 Correct 12 ms 5976 KB Output is correct
41 Correct 172 ms 5964 KB Output is correct
42 Correct 11 ms 5976 KB Output is correct
43 Correct 18 ms 5980 KB Output is correct
44 Correct 231 ms 5976 KB Output is correct
45 Correct 15 ms 6104 KB Output is correct
46 Correct 17 ms 6104 KB Output is correct
47 Correct 259 ms 6236 KB Output is correct
48 Correct 18 ms 6236 KB Output is correct
49 Correct 21 ms 6236 KB Output is correct
50 Correct 345 ms 6444 KB Output is correct
51 Correct 22 ms 6492 KB Output is correct
52 Correct 21 ms 6488 KB Output is correct
53 Correct 395 ms 6596 KB Output is correct
54 Correct 27 ms 6748 KB Output is correct
55 Correct 28 ms 6616 KB Output is correct
56 Correct 454 ms 6756 KB Output is correct
57 Correct 27 ms 6532 KB Output is correct
58 Correct 32 ms 6744 KB Output is correct
59 Correct 613 ms 6780 KB Output is correct
60 Correct 28 ms 6740 KB Output is correct
61 Correct 26 ms 6744 KB Output is correct
62 Correct 556 ms 6780 KB Output is correct
63 Correct 161 ms 6740 KB Output is correct
64 Correct 531 ms 6788 KB Output is correct
65 Correct 380 ms 6992 KB Output is correct
66 Correct 242 ms 6784 KB Output is correct
67 Correct 168 ms 6784 KB Output is correct
68 Correct 102 ms 6736 KB Output is correct
69 Correct 81 ms 6740 KB Output is correct
70 Correct 61 ms 6656 KB Output is correct
71 Correct 60 ms 6656 KB Output is correct
72 Incorrect 46 ms 6652 KB Output isn't correct
73 Incorrect 103 ms 6856 KB Output isn't correct
74 Correct 220 ms 7100 KB Output is correct
75 Correct 197 ms 6992 KB Output is correct
76 Correct 183 ms 7108 KB Output is correct
77 Correct 182 ms 6924 KB Output is correct
78 Correct 194 ms 7064 KB Output is correct
79 Correct 197 ms 6900 KB Output is correct
80 Correct 187 ms 7068 KB Output is correct
81 Correct 235 ms 7064 KB Output is correct
82 Correct 206 ms 7064 KB Output is correct
83 Correct 203 ms 7020 KB Output is correct
84 Correct 338 ms 6852 KB Output is correct
85 Correct 264 ms 6856 KB Output is correct
86 Correct 265 ms 7020 KB Output is correct
87 Correct 299 ms 6996 KB Output is correct
88 Correct 256 ms 6740 KB Output is correct
89 Correct 422 ms 6740 KB Output is correct
90 Correct 301 ms 6960 KB Output is correct
91 Correct 319 ms 6952 KB Output is correct
92 Correct 292 ms 6740 KB Output is correct