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Submission #443375

# Submission time Handle Problem Language Result Execution time Memory
443375 2021-07-10T12:13:27 Z MohammadAghil Mecho (IOI09_mecho) C++14
100 / 100
 213 ms 11584 KB 
#include <bits/stdc++.h> 
using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(i,l,r) for(int i = (l); i < r; i++)
#define per(i,r,l) for(int i = (r); i >= l; i--)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define pb push_back
#define ff first
#define ss second 
 
const ll mod = 998244353, maxn = 800 + 5, inf = 1e18 + 5;

int dx[4] = {-1, 0, 1, 0}, dy[4] = {0, 1, 0, -1};
bool bad[maxn][maxn];
ll dist_bee[maxn][maxn], dist[maxn][maxn];

int main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    ll n, s; cin >> n >> s;
    pair<ll, ll> st, en;
    deque<pair<ll, ll>> hol;  
    rep(i,0,n){
        rep(j,0,n){
            dist_bee[i][j] = inf;
            char e; cin >> e;
            if(e == 'M'){
                st = {i, j};
            }
            if(e == 'D'){
                en = {i, j};
            }
            if(e == 'H'){
                hol.push_back({i, j});
                dist_bee[i][j] = 0;
            }
            if(e == 'H' || e == 'T') bad[i][j] = 1;
        }
    }
    while(sz(hol)){
        pair<ll, ll> p = hol.front(); hol.pop_front();
        rep(d,0,4){
            ll i = p.ff + dx[d], j = p.ss + dy[d];
            if(i < 0 || i >= n || j < 0 || j >= n || dist_bee[i][j] != inf || bad[i][j] || pair<ll, ll>{i, j} == en)  continue;
            dist_bee[i][j] = dist_bee[p.ff][p.ss] + s;
            hol.pb({i, j});
        }
    }

    dist_bee[en.ff][en.ss] = inf;
    auto chk = [&](ll t) -> bool{
        if(dist_bee[st.ff][st.ss] <= 1LL*t*s) return 0; 
        rep(i,0,n){
            rep(j,0,n){
                dist[i][j] = inf;
            }
        }
        dist[st.ff][st.ss] = 1LL*t*s;
        deque<pair<ll, ll>> q;
        q.push_back(st);
        while(sz(q)){
            pair<ll, ll> p = q.front(); q.pop_front();
            if(p == en) return 1;
            rep(d,0,4){
                ll i = p.ff + dx[d], j = p.ss + dy[d];
                if(i < 0 || i >= n || j < 0 || j >= n || bad[i][j] 
                    || dist[i][j] != inf || (dist[p.ff][p.ss] + 1) >= dist_bee[i][j]) continue;
                dist[i][j] = dist[p.ff][p.ss] + 1;
                q.push_back({i, j});
            }
        }
        return 0;
    };
    ll l = -1, r = 1e7;
    while(l + 1 < r){
        ll mid = (l + r)/2;
        if(chk(mid)) l = mid;
        else r = mid;
    }
    cout << l;
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 131 ms 11160 KB Output is correct
8 Correct 0 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 460 KB Output is correct
12 Correct 1 ms 844 KB Output is correct
13 Correct 1 ms 716 KB Output is correct
14 Correct 1 ms 844 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 1 ms 460 KB Output is correct
17 Correct 1 ms 460 KB Output is correct
18 Correct 1 ms 460 KB Output is correct
19 Correct 1 ms 588 KB Output is correct
20 Correct 1 ms 588 KB Output is correct
21 Correct 1 ms 588 KB Output is correct
22 Correct 1 ms 716 KB Output is correct
23 Correct 1 ms 716 KB Output is correct
24 Correct 1 ms 716 KB Output is correct
25 Correct 1 ms 844 KB Output is correct
26 Correct 1 ms 844 KB Output is correct
27 Correct 1 ms 972 KB Output is correct
28 Correct 1 ms 972 KB Output is correct
29 Correct 1 ms 972 KB Output is correct
30 Correct 1 ms 972 KB Output is correct
31 Correct 1 ms 972 KB Output is correct
32 Correct 1 ms 972 KB Output is correct
33 Correct 7 ms 4940 KB Output is correct
34 Correct 7 ms 4940 KB Output is correct
35 Correct 28 ms 4940 KB Output is correct
36 Correct 8 ms 5580 KB Output is correct
37 Correct 8 ms 5580 KB Output is correct
38 Correct 37 ms 5580 KB Output is correct
39 Correct 10 ms 6348 KB Output is correct
40 Correct 10 ms 6328 KB Output is correct
41 Correct 47 ms 6260 KB Output is correct
42 Correct 13 ms 6988 KB Output is correct
43 Correct 12 ms 6988 KB Output is correct
44 Correct 58 ms 7076 KB Output is correct
45 Correct 17 ms 7688 KB Output is correct
46 Correct 15 ms 7628 KB Output is correct
47 Correct 66 ms 7700 KB Output is correct
48 Correct 16 ms 8268 KB Output is correct
49 Correct 17 ms 8300 KB Output is correct
50 Correct 82 ms 8364 KB Output is correct
51 Correct 18 ms 9036 KB Output is correct
52 Correct 20 ms 9032 KB Output is correct
53 Correct 110 ms 9028 KB Output is correct
54 Correct 22 ms 9588 KB Output is correct
55 Correct 24 ms 9592 KB Output is correct
56 Correct 123 ms 9656 KB Output is correct
57 Correct 25 ms 10264 KB Output is correct
58 Correct 24 ms 10296 KB Output is correct
59 Correct 143 ms 10272 KB Output is correct
60 Correct 27 ms 11076 KB Output is correct
61 Correct 26 ms 11004 KB Output is correct
62 Correct 174 ms 11124 KB Output is correct
63 Correct 147 ms 10976 KB Output is correct
64 Correct 213 ms 11000 KB Output is correct
65 Correct 209 ms 10916 KB Output is correct
66 Correct 182 ms 11076 KB Output is correct
67 Correct 151 ms 10948 KB Output is correct
68 Correct 71 ms 11176 KB Output is correct
69 Correct 75 ms 11084 KB Output is correct
70 Correct 54 ms 11076 KB Output is correct
71 Correct 60 ms 11036 KB Output is correct
72 Correct 46 ms 10996 KB Output is correct
73 Correct 47 ms 11480 KB Output is correct
74 Correct 81 ms 11512 KB Output is correct
75 Correct 95 ms 11584 KB Output is correct
76 Correct 86 ms 11548 KB Output is correct
77 Correct 86 ms 11460 KB Output is correct
78 Correct 103 ms 11512 KB Output is correct
79 Correct 67 ms 11460 KB Output is correct
80 Correct 81 ms 11460 KB Output is correct
81 Correct 98 ms 11480 KB Output is correct
82 Correct 86 ms 11468 KB Output is correct
83 Correct 113 ms 11404 KB Output is correct
84 Correct 97 ms 11444 KB Output is correct
85 Correct 93 ms 11412 KB Output is correct
86 Correct 104 ms 11460 KB Output is correct
87 Correct 106 ms 11388 KB Output is correct
88 Correct 111 ms 11344 KB Output is correct
89 Correct 120 ms 11308 KB Output is correct
90 Correct 117 ms 11316 KB Output is correct
91 Correct 128 ms 11316 KB Output is correct
92 Correct 123 ms 11332 KB Output is correct