oj.uz

Submission #953270

# Submission time Handle Problem Language Result Execution time Memory
953270 2024-03-25T18:45:11 Z dpsaveslives Mecho (IOI09_mecho) C++17
84 / 100
 191 ms 16836 KB 
#include <bits/stdc++.h>
#define int long long
#define f first
#define s second
using namespace std;
const int MAXN = 810;
char grid[MAXN][MAXN];
int dr[4] = {0,0,1,-1}, dc[4] = {1,-1,0,0},N;
bool goodbees(int r, int c){
    return r >= 0 && c >= 0 && r <= N-1 && c <= N-1 && grid[r][c] != 'T' && grid[r][c] != 'D';
}
bool goodmecho(int r, int c){
    return r >= 0 && c >= 0 && r <= N-1 && c <= N-1 && grid[r][c] != 'T';
}
const int INF = 1e18;
int32_t main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int S; cin >> N >> S;
    queue<pair<int,int>> q;
    vector<vector<int>> dist(N,vector<int>(N,INF));
    pair<int,int> m,home;
    for(int i = 0;i<N;++i){
        for(int j = 0;j<N;++j){
            cin >> grid[i][j];
            if(grid[i][j] == 'H'){
                q.push({i,j});
                dist[i][j] = 0;
            }
            else if(grid[i][j] == 'M'){
                m.f = i, m.s = j;
            }
            else if(grid[i][j] == 'D'){
                home.f = i, home.s = j;
            }
        }
    }
    while(!q.empty()){
        int r = q.front().f, c = q.front().s; q.pop();
        for(int i = 0;i<4;++i){
            int nr = r+dr[i], nc = c+dc[i];
            if(goodbees(nr,nc)){
                if(dist[nr][nc] > dist[r][c]+1){
                    dist[nr][nc] = dist[r][c]+1;
                    q.push({nr,nc});
                }
            }
        }
    }
    /*vector<vector<int>> mecho(N,vector<int>(N,INF));
    mecho[m.f][m.s] = 0; q.push(m);
    while(!q.empty()){
        int r = q.front().f, c = q.front().s; q.pop();
        for(int i = 0;i<4;++i){
            int nr = r+dr[i], nc = c+dc[i];
            if(goodmecho(nr,nc)){
                if(mecho[nr][nc] > mecho[r][c]+1){
                    mecho[nr][nc] = mecho[r][c]+1;
                    q.push({nr,nc});
                }
            }
        }
    }*/
    int lo = 0, hi = INF;
    if(hi < 0){
        cout << "-1\n";
        return 0;
    }
    vector<vector<int>> D(N,vector<int>(N,INF));
    --lo;
    while(lo < hi){
        int mid = lo+(hi-lo+1)/2; //time
        //cout << mid << "\n";
        D = vector<vector<int>>(N,vector<int>(N,INF));
        q.push(m); D[m.f][m.s] = 0;
        while(!q.empty()){
            int r = q.front().f, c = q.front().s; q.pop();
            //cout << r << " " << c << "\n";
            for(int i = 0;i<4;++i){
                int nr = r+dr[i], nc = c+dc[i];
                if(goodmecho(nr,nc)){
                    if((D[r][c]+1)/S +mid < dist[nr][nc] && D[r][c]+1 < D[nr][nc]){
                        D[nr][nc] = D[r][c]+1;
                        q.push({nr,nc});
                    }
                }
            }
        }
        if(D[home.f][home.s] == INF){
            hi = mid-1;
        }
        else{
            lo = mid;
        }
    }
    cout << lo << "\n";
    return 0;
}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 600 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 181 ms 16484 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Incorrect 1 ms 604 KB Output isn't correct
13 Incorrect 1 ms 348 KB Output isn't correct
14 Correct 1 ms 600 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 600 KB Output is correct
19 Correct 1 ms 344 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 604 KB Output is correct
26 Correct 1 ms 600 KB Output is correct
27 Correct 1 ms 604 KB Output is correct
28 Correct 1 ms 600 KB Output is correct
29 Correct 1 ms 604 KB Output is correct
30 Correct 1 ms 604 KB Output is correct
31 Correct 1 ms 604 KB Output is correct
32 Correct 1 ms 600 KB Output is correct
33 Correct 12 ms 3776 KB Output is correct
34 Correct 12 ms 3776 KB Output is correct
35 Correct 28 ms 3664 KB Output is correct
36 Correct 16 ms 4840 KB Output is correct
37 Correct 16 ms 4904 KB Output is correct
38 Correct 36 ms 4588 KB Output is correct
39 Correct 20 ms 5696 KB Output is correct
40 Correct 20 ms 5728 KB Output is correct
41 Correct 46 ms 5632 KB Output is correct
42 Correct 24 ms 6872 KB Output is correct
43 Correct 24 ms 6912 KB Output is correct
44 Correct 74 ms 6864 KB Output is correct
45 Correct 29 ms 8128 KB Output is correct
46 Correct 29 ms 8240 KB Output is correct
47 Correct 70 ms 8256 KB Output is correct
48 Correct 34 ms 9516 KB Output is correct
49 Correct 34 ms 9544 KB Output is correct
50 Correct 86 ms 9532 KB Output is correct
51 Correct 42 ms 11080 KB Output is correct
52 Correct 41 ms 11340 KB Output is correct
53 Correct 99 ms 11040 KB Output is correct
54 Correct 45 ms 12804 KB Output is correct
55 Correct 45 ms 12804 KB Output is correct
56 Correct 121 ms 12752 KB Output is correct
57 Correct 53 ms 14520 KB Output is correct
58 Correct 53 ms 14524 KB Output is correct
59 Correct 154 ms 14468 KB Output is correct
60 Correct 61 ms 16372 KB Output is correct
61 Correct 60 ms 16404 KB Output is correct
62 Correct 167 ms 16456 KB Output is correct
63 Correct 152 ms 16836 KB Output is correct
64 Correct 191 ms 16324 KB Output is correct
65 Correct 163 ms 16416 KB Output is correct
66 Correct 155 ms 16464 KB Output is correct
67 Correct 140 ms 16332 KB Output is correct
68 Correct 87 ms 16536 KB Output is correct
69 Correct 79 ms 16356 KB Output is correct
70 Correct 79 ms 16624 KB Output is correct
71 Correct 79 ms 16444 KB Output is correct
72 Incorrect 74 ms 16396 KB Output isn't correct
73 Incorrect 76 ms 16340 KB Output isn't correct
74 Correct 109 ms 16520 KB Output is correct
75 Correct 120 ms 16532 KB Output is correct
76 Correct 103 ms 16380 KB Output is correct
77 Correct 108 ms 16376 KB Output is correct
78 Correct 123 ms 16372 KB Output is correct
79 Correct 106 ms 16684 KB Output is correct
80 Correct 106 ms 16368 KB Output is correct
81 Correct 127 ms 16380 KB Output is correct
82 Correct 103 ms 16448 KB Output is correct
83 Correct 132 ms 16580 KB Output is correct
84 Correct 114 ms 16392 KB Output is correct
85 Correct 123 ms 16476 KB Output is correct
86 Correct 167 ms 16308 KB Output is correct
87 Correct 112 ms 16376 KB Output is correct
88 Correct 127 ms 16420 KB Output is correct
89 Correct 136 ms 16396 KB Output is correct
90 Correct 129 ms 16344 KB Output is correct
91 Correct 145 ms 16356 KB Output is correct
92 Correct 140 ms 16380 KB Output is correct