oj.uz

Submission #698916

# Submission time Handle Problem Language Result Execution time Memory
698916 2023-02-14T18:11:16 Z aedmhsn Mecho (IOI09_mecho) C++17
100 / 100
 206 ms 11664 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
 
#define A first
#define B second
#define MP make_pair
#define ms(a, x) memset(a, x, sizeof(a)) 
 
 
#define boost() ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
 
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pld;
const int INF = 0x3f3f3f3f;
 
const ll LLINF = 0x3f3f3f3f3f3f3f3f;
const double PI = acos(-1);

const int mxN=805;

char grid[mxN][mxN];
ll dist[2][mxN][mxN];

queue <pll> q;
vector <pll> moves={{1, 0}, {-1, 0}, {0, -1}, {0, 1}};

int n, s;
bool valid(int i, int j){
    if(i >= 1 && i <= n && j >= 1 && j <= n && grid[i][j] != 'H' && grid[i][j] != 'T')
        return true;
    return false;
}



void bfs(){
    while(!q.empty()){
        pii u = q.front();
        q.pop();
        for(auto [x, y]:moves){
            if(valid(u.A+x, u.B+y) && grid[u.A+x][u.B+y] != 'D' && dist[0][u.A+x][u.B+y] == -1){
                dist[0][u.A+x][u.B+y] = dist[0][u.A][u.B]+1;
                q.push({u.A+x, u.B+y});
            }
        }
    }
}
void bfs2(ll rest){
    while(!q.empty()){
        pii u = q.front();
        q.pop();
        for(auto [x,y]:moves){
            if(valid(u.A+x, u.B+y) && dist[1][u.A+x][u.B+y] == -1 && (dist[1][u.A][u.B]+1)/s < dist[0][u.A+x][u.B+y]-rest){
                dist[1][u.A+x][u.B+y] = dist[1][u.A][u.B]+1;
                q.push({u.A+x, u.B+y});
            }
        }
    }
}

int main(){
    ms(dist, -1);
    cin >> n >> s;
    pii ip, ep;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            cin >> grid[i][j];
            if(grid[i][j] == 'H'){
                q.push({i, j});
                dist[0][i][j]=0;
            }
            else if(grid[i][j] == 'M')
                ip={i, j};
            else if(grid[i][j] == 'D')
                ep={i, j};
        }
    }
    ll st=0, en=1e9, mid, ans=-1;
    bfs();
    dist[0][ep.A][ep.B] = INT_MAX;
    while(st<=en){
        mid = (st+en)/2;
        q.push(ip);
        ms(dist[1], -1);
        dist[1][ip.A][ip.B]=0;
        bfs2(mid);
        if(dist[1][ep.A][ep.B] != -1 && mid < dist[0][ip.A][ip.B]){
            ans = mid;
            st = mid+1;
        }
        else
            en = mid-1;
    }
    cout << ans;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 10452 KB Output is correct
2 Correct 8 ms 10452 KB Output is correct
3 Correct 8 ms 10452 KB Output is correct
4 Correct 8 ms 10452 KB Output is correct
5 Correct 8 ms 10452 KB Output is correct
6 Correct 10 ms 10456 KB Output is correct
7 Correct 125 ms 11288 KB Output is correct
8 Correct 9 ms 10452 KB Output is correct
9 Correct 11 ms 10460 KB Output is correct
10 Correct 8 ms 10452 KB Output is correct
11 Correct 8 ms 10452 KB Output is correct
12 Correct 11 ms 10496 KB Output is correct
13 Correct 9 ms 10496 KB Output is correct
14 Correct 9 ms 10452 KB Output is correct
15 Correct 8 ms 10452 KB Output is correct
16 Correct 8 ms 10452 KB Output is correct
17 Correct 8 ms 10452 KB Output is correct
18 Correct 9 ms 10452 KB Output is correct
19 Correct 9 ms 10468 KB Output is correct
20 Correct 9 ms 10452 KB Output is correct
21 Correct 8 ms 10452 KB Output is correct
22 Correct 8 ms 10452 KB Output is correct
23 Correct 8 ms 10452 KB Output is correct
24 Correct 9 ms 10452 KB Output is correct
25 Correct 9 ms 10452 KB Output is correct
26 Correct 9 ms 10452 KB Output is correct
27 Correct 8 ms 10452 KB Output is correct
28 Correct 8 ms 10500 KB Output is correct
29 Correct 11 ms 10504 KB Output is correct
30 Correct 9 ms 10452 KB Output is correct
31 Correct 10 ms 10504 KB Output is correct
32 Correct 9 ms 10452 KB Output is correct
33 Correct 17 ms 10732 KB Output is correct
34 Correct 19 ms 10720 KB Output is correct
35 Correct 37 ms 10728 KB Output is correct
36 Correct 19 ms 10708 KB Output is correct
37 Correct 19 ms 10712 KB Output is correct
38 Correct 42 ms 10680 KB Output is correct
39 Correct 25 ms 10708 KB Output is correct
40 Correct 24 ms 10708 KB Output is correct
41 Correct 51 ms 10808 KB Output is correct
42 Correct 24 ms 10848 KB Output is correct
43 Correct 24 ms 10736 KB Output is correct
44 Correct 65 ms 10836 KB Output is correct
45 Correct 29 ms 10880 KB Output is correct
46 Correct 28 ms 10784 KB Output is correct
47 Correct 79 ms 10876 KB Output is correct
48 Correct 34 ms 10836 KB Output is correct
49 Correct 33 ms 10900 KB Output is correct
50 Correct 88 ms 10876 KB Output is correct
51 Correct 38 ms 10932 KB Output is correct
52 Correct 39 ms 10900 KB Output is correct
53 Correct 122 ms 10936 KB Output is correct
54 Correct 43 ms 10964 KB Output is correct
55 Correct 48 ms 10980 KB Output is correct
56 Correct 128 ms 10992 KB Output is correct
57 Correct 46 ms 11084 KB Output is correct
58 Correct 44 ms 11020 KB Output is correct
59 Correct 150 ms 11032 KB Output is correct
60 Correct 50 ms 11060 KB Output is correct
61 Correct 53 ms 11060 KB Output is correct
62 Correct 172 ms 11112 KB Output is correct
63 Correct 141 ms 11068 KB Output is correct
64 Correct 203 ms 10956 KB Output is correct
65 Correct 206 ms 11068 KB Output is correct
66 Correct 159 ms 11072 KB Output is correct
67 Correct 139 ms 11068 KB Output is correct
68 Correct 78 ms 11084 KB Output is correct
69 Correct 85 ms 11140 KB Output is correct
70 Correct 65 ms 11124 KB Output is correct
71 Correct 71 ms 11092 KB Output is correct
72 Correct 63 ms 11252 KB Output is correct
73 Correct 78 ms 11596 KB Output is correct
74 Correct 92 ms 11596 KB Output is correct
75 Correct 118 ms 11612 KB Output is correct
76 Correct 94 ms 11620 KB Output is correct
77 Correct 94 ms 11616 KB Output is correct
78 Correct 119 ms 11468 KB Output is correct
79 Correct 87 ms 11564 KB Output is correct
80 Correct 94 ms 11664 KB Output is correct
81 Correct 106 ms 11540 KB Output is correct
82 Correct 92 ms 11444 KB Output is correct
83 Correct 115 ms 11384 KB Output is correct
84 Correct 113 ms 11480 KB Output is correct
85 Correct 105 ms 11480 KB Output is correct
86 Correct 124 ms 11512 KB Output is correct
87 Correct 108 ms 11468 KB Output is correct
88 Correct 121 ms 11284 KB Output is correct
89 Correct 117 ms 11388 KB Output is correct
90 Correct 131 ms 11384 KB Output is correct
91 Correct 113 ms 11340 KB Output is correct
92 Correct 126 ms 11388 KB Output is correct