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Submission #693248

# Submission time Handle Problem Language Result Execution time Memory
693248 2023-02-02T13:46:17 Z Sunbae Mecho (IOI09_mecho) C++17
100 / 100
 187 ms 6932 KB 
#include <bits/stdc++.h>
#define infi INT_MAX
using namespace std;
using pii = pair<int,int>;
const int N = 801;
vector<pii>path = {{-1, 0}, {+1, 0}, {0, -1}, {0, +1}}; 
int n, s;
char grid[N][N];
int bees[N][N];
bool vis[N][N];
int dist[N][N];
int sr, sc;
int dr, dc;
 
queue<pii>Q;
queue<pair<int, pii>>q;
bool Valid(int i, int j){
    return (i>=0 && j>=0 && i<n && j<n); 
}
void initial(int type){
    if(type == 0){
        for(int i = 0; i<n; i++){
            for(int j = 0; j<n; j++){
                bees[i][j] = infi;
            }
        }
    }else if(type == 1){
        for(int i = 0; i<n; i++){
            for(int j = 0; j<n; j++){
                dist[i][j] = infi;
            }
        }
    }
}
bool check(int wait){
    if(wait >= bees[sr][sc]) return false;
    memset(vis, false, sizeof(vis));
    initial(1);
    q.push({sr, {sc, 0}}); dist[sr][sc] = wait;
    while(!q.empty()){
        int i = q.front().first;
        int j = q.front().second.first;
        int cnt = q.front().second.second;
        q.pop(); 
        if(dist[i][j] == infi) continue;
        for(pii it: path){
            int x = i + it.first; int y = j + it.second;
            int distXY = dist[i][j] + ((cnt+1)%s == 0); 
            if(Valid(x, y) && !vis[x][y] && grid[x][y] != 'T' && grid[x][y] != 'H' && distXY < bees[x][y]){
                dist[x][y] = distXY;
                vis[x][y] = true;
                q.push({x, {y, cnt+1}});
            }
        }
    }
    if(dist[dr][dc] == infi) return false;
    else return true; 
}
int32_t main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin>>n>>s;
    initial(0); memset(vis, false, sizeof(vis));
    for(int i = 0; i<n; i++){
        string s; cin>>s;
        for(int j = 0; j<n; j++){
            grid[i][j] = s[j];
            if(grid[i][j] == 'M'){
                sr = i; sc = j;
            }else if(grid[i][j] == 'D'){
                dr = i; dc= j;
            }else if(grid[i][j] == 'H'){
                Q.push({i, j}); bees[i][j] = 0; vis[i][j] = true; 
            }
        } 
    }
    while(!Q.empty()){
        int i = Q.front().first; 
        int j = Q.front().second;
        Q.pop();
        for(pii it: path){
            int x = i + it.first; int y = j + it.second;
            if(Valid(x, y) && !vis[x][y] && grid[x][y] != 'T' && grid[x][y] != 'D'){
                vis[x][y] = true;
                bees[x][y] = bees[i][j] + 1; 
                Q.push({x, y}); 
            }
        }
    }
    int l = 0, h = n*n;
    int ans = -1;
    while(l<=h){
        int mid = l + (h-l)/2;
        if(check(mid)){
            l = mid+1;
            ans = mid;
        }else{
            h = mid-1;
        }
    }
    cout<<ans;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 980 KB Output is correct
2 Correct 1 ms 980 KB Output is correct
3 Correct 1 ms 980 KB Output is correct
4 Correct 1 ms 980 KB Output is correct
5 Correct 1 ms 980 KB Output is correct
6 Correct 1 ms 980 KB Output is correct
7 Correct 99 ms 6664 KB Output is correct
8 Correct 1 ms 980 KB Output is correct
9 Correct 1 ms 980 KB Output is correct
10 Correct 1 ms 980 KB Output is correct
11 Correct 1 ms 980 KB Output is correct
12 Correct 1 ms 1364 KB Output is correct
13 Correct 1 ms 1236 KB Output is correct
14 Correct 1 ms 1364 KB Output is correct
15 Correct 1 ms 1108 KB Output is correct
16 Correct 1 ms 980 KB Output is correct
17 Correct 1 ms 1108 KB Output is correct
18 Correct 1 ms 1108 KB Output is correct
19 Correct 1 ms 1108 KB Output is correct
20 Correct 1 ms 1108 KB Output is correct
21 Correct 1 ms 1236 KB Output is correct
22 Correct 1 ms 1236 KB Output is correct
23 Correct 1 ms 1236 KB Output is correct
24 Correct 1 ms 1236 KB Output is correct
25 Correct 1 ms 1364 KB Output is correct
26 Correct 1 ms 1364 KB Output is correct
27 Correct 1 ms 1364 KB Output is correct
28 Correct 1 ms 1364 KB Output is correct
29 Correct 1 ms 1364 KB Output is correct
30 Correct 1 ms 1364 KB Output is correct
31 Correct 1 ms 1492 KB Output is correct
32 Correct 1 ms 1492 KB Output is correct
33 Correct 5 ms 3436 KB Output is correct
34 Correct 4 ms 3412 KB Output is correct
35 Correct 20 ms 3412 KB Output is correct
36 Correct 5 ms 3700 KB Output is correct
37 Correct 9 ms 3796 KB Output is correct
38 Correct 29 ms 3796 KB Output is correct
39 Correct 7 ms 4052 KB Output is correct
40 Correct 8 ms 4160 KB Output is correct
41 Correct 39 ms 4052 KB Output is correct
42 Correct 9 ms 4436 KB Output is correct
43 Correct 9 ms 4512 KB Output is correct
44 Correct 39 ms 4520 KB Output is correct
45 Correct 12 ms 4820 KB Output is correct
46 Correct 10 ms 4864 KB Output is correct
47 Correct 54 ms 4820 KB Output is correct
48 Correct 11 ms 5204 KB Output is correct
49 Correct 15 ms 5204 KB Output is correct
50 Correct 69 ms 5216 KB Output is correct
51 Correct 13 ms 5584 KB Output is correct
52 Correct 13 ms 5464 KB Output is correct
53 Correct 66 ms 5480 KB Output is correct
54 Correct 14 ms 5844 KB Output is correct
55 Correct 15 ms 5932 KB Output is correct
56 Correct 81 ms 5924 KB Output is correct
57 Correct 16 ms 6288 KB Output is correct
58 Correct 18 ms 6244 KB Output is correct
59 Correct 98 ms 6288 KB Output is correct
60 Correct 18 ms 6612 KB Output is correct
61 Correct 19 ms 6612 KB Output is correct
62 Correct 106 ms 6628 KB Output is correct
63 Correct 93 ms 6616 KB Output is correct
64 Correct 187 ms 6612 KB Output is correct
65 Correct 138 ms 6616 KB Output is correct
66 Correct 123 ms 6620 KB Output is correct
67 Correct 105 ms 6616 KB Output is correct
68 Correct 41 ms 6640 KB Output is correct
69 Correct 39 ms 6612 KB Output is correct
70 Correct 29 ms 6564 KB Output is correct
71 Correct 35 ms 6600 KB Output is correct
72 Correct 24 ms 6572 KB Output is correct
73 Correct 27 ms 6832 KB Output is correct
74 Correct 48 ms 6892 KB Output is correct
75 Correct 70 ms 6932 KB Output is correct
76 Correct 50 ms 6844 KB Output is correct
77 Correct 49 ms 6848 KB Output is correct
78 Correct 65 ms 6880 KB Output is correct
79 Correct 41 ms 6868 KB Output is correct
80 Correct 55 ms 6864 KB Output is correct
81 Correct 63 ms 6812 KB Output is correct
82 Correct 53 ms 6932 KB Output is correct
83 Correct 64 ms 6828 KB Output is correct
84 Correct 60 ms 6732 KB Output is correct
85 Correct 67 ms 6828 KB Output is correct
86 Correct 60 ms 6820 KB Output is correct
87 Correct 64 ms 6740 KB Output is correct
88 Correct 68 ms 6828 KB Output is correct
89 Correct 69 ms 6776 KB Output is correct
90 Correct 78 ms 6772 KB Output is correct
91 Correct 72 ms 6772 KB Output is correct
92 Correct 72 ms 6768 KB Output is correct