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Submission #549457

# Submission time Handle Problem Language Result Execution time Memory
549457 2022-04-15T20:23:21 Z beaconmc Mecho (IOI09_mecho) C++14
100 / 100
 418 ms 13020 KB 
#include <bits/stdc++.h>


typedef long long ll;
using namespace std;

#define FOR(i, x, y) for(ll i=x; i<y; i++)
#define FORNEG(i, x, y) for(ll i=x; i>y; i--)
#define fast() ios_base::sync_with_stdio(false);cin.tie(NULL)


ll grid[801][801];
ll visited[801][801];
ll n,s;
vector<vector<ll>> hives;
vector<ll> start;
vector<ll> endd;
vector<vector<ll>> ops = {{0,1}, {0,-1}, {1,0}, {-1,0}};

void bfsinit(){
    queue<vector<ll>> d;
    for (auto&i : hives){
        d.push({i[0], i[1], 0});
    }
    while (d.size()){
        vector<ll> node = d.front();;
        d.pop();
        for (auto&i : ops){
            ll a = node[0] + i[0];
            ll b = node[1] + i[1];
            if (0<=a && a<n && 0<=b && b<n){
                if (grid[a][b] == -3){
                    d.push({a,b,node[2]+1});
                    grid[a][b] = node[2]+1;
                }

            }
        }

    }

}

bool test(ll time){
    queue<vector<ll>> d;
    if (grid[start[0]][start[1]] <= time){
        return false;
    }
    FOR(i,0,n){
        FOR(j,0,n){
            visited[i][j] = false;
        }
    }
    d.push({start[0], start[1], 0});
    while (d.size()){
        vector<ll> node = d.front();
        d.pop();
        if (node[0]==endd[0] && node[1] == endd[1]){
            return true;
        }
        for (auto&i : ops){
            ll a = node[0]+i[0];
            ll b = node[1] + i[1];
            if (0<=a && a<n && 0<=b && b<n && !(visited[a][b])){
                if (grid[a][b] == -2) continue;
                if (grid[a][b] == -1 || grid[a][b] > time+(node[2]+1)/s){
                    d.push({a,b,node[2]+1});
                    visited[a][b] = true;
                }
            }

        }
    }
    return false;
}


int main(){
    fast();
    cin >> n >> s;
    FOR(i,0,n){
        string sus;
        cin >> sus;
        FOR(j,0,n){
            grid[i][j] = sus[j];
        }
    }
    FOR(i,0,n){
        FOR(j,0,n){
            if (grid[i][j] == 'T') grid[i][j] = -2;
            else if (grid[i][j] == 'D'){
                grid[i][j] = -1;
                endd = {i,j};
            } 
            else if (grid[i][j] == 'H'){
                grid[i][j] = 0;
                hives.push_back({i,j});
            } 
            else if (grid[i][j] == 'M'){
                start = {i,j};
                grid[i][j] = -3;
            }
            else{
                grid[i][j] = -3;
            }
        }
    }
    bfsinit();
    ll lo = -1;
    ll hi = n*n;
    while (lo<hi){
        ll mid = lo+(hi-lo+1)/2;
        if (test(mid)) lo = mid;
        else hi = mid-1;
    }
    cout << lo;

}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 324 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 270 ms 11880 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 852 KB Output is correct
13 Correct 1 ms 716 KB Output is correct
14 Correct 1 ms 852 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 456 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 580 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 1 ms 580 KB Output is correct
23 Correct 1 ms 724 KB Output is correct
24 Correct 1 ms 708 KB Output is correct
25 Correct 1 ms 852 KB Output is correct
26 Correct 1 ms 852 KB Output is correct
27 Correct 1 ms 852 KB Output is correct
28 Correct 1 ms 852 KB Output is correct
29 Correct 1 ms 852 KB Output is correct
30 Correct 1 ms 980 KB Output is correct
31 Correct 1 ms 980 KB Output is correct
32 Correct 2 ms 980 KB Output is correct
33 Correct 7 ms 4820 KB Output is correct
34 Correct 9 ms 4828 KB Output is correct
35 Correct 48 ms 4788 KB Output is correct
36 Correct 8 ms 5460 KB Output is correct
37 Correct 10 ms 5460 KB Output is correct
38 Correct 69 ms 5492 KB Output is correct
39 Correct 10 ms 6308 KB Output is correct
40 Correct 16 ms 6100 KB Output is correct
41 Correct 113 ms 6208 KB Output is correct
42 Correct 12 ms 6816 KB Output is correct
43 Correct 14 ms 6740 KB Output is correct
44 Correct 113 ms 6832 KB Output is correct
45 Correct 14 ms 7476 KB Output is correct
46 Correct 21 ms 7376 KB Output is correct
47 Correct 154 ms 7504 KB Output is correct
48 Correct 17 ms 8068 KB Output is correct
49 Correct 19 ms 8008 KB Output is correct
50 Correct 147 ms 8248 KB Output is correct
51 Correct 18 ms 8788 KB Output is correct
52 Correct 23 ms 8640 KB Output is correct
53 Correct 233 ms 8944 KB Output is correct
54 Correct 24 ms 9352 KB Output is correct
55 Correct 25 ms 9348 KB Output is correct
56 Correct 266 ms 9720 KB Output is correct
57 Correct 27 ms 10164 KB Output is correct
58 Correct 41 ms 10040 KB Output is correct
59 Correct 269 ms 10368 KB Output is correct
60 Correct 31 ms 10896 KB Output is correct
61 Correct 34 ms 10976 KB Output is correct
62 Correct 379 ms 11056 KB Output is correct
63 Correct 198 ms 11028 KB Output is correct
64 Correct 418 ms 11024 KB Output is correct
65 Correct 288 ms 11036 KB Output is correct
66 Correct 282 ms 11044 KB Output is correct
67 Correct 218 ms 11036 KB Output is correct
68 Correct 107 ms 11200 KB Output is correct
69 Correct 94 ms 11192 KB Output is correct
70 Correct 61 ms 11208 KB Output is correct
71 Correct 76 ms 11204 KB Output is correct
72 Correct 50 ms 11200 KB Output is correct
73 Correct 108 ms 13016 KB Output is correct
74 Correct 147 ms 13020 KB Output is correct
75 Correct 181 ms 13004 KB Output is correct
76 Correct 171 ms 13012 KB Output is correct
77 Correct 171 ms 13008 KB Output is correct
78 Correct 198 ms 12792 KB Output is correct
79 Correct 134 ms 12780 KB Output is correct
80 Correct 151 ms 12788 KB Output is correct
81 Correct 166 ms 12792 KB Output is correct
82 Correct 184 ms 12748 KB Output is correct
83 Correct 207 ms 12484 KB Output is correct
84 Correct 184 ms 12552 KB Output is correct
85 Correct 223 ms 12588 KB Output is correct
86 Correct 189 ms 12480 KB Output is correct
87 Correct 204 ms 12472 KB Output is correct
88 Correct 222 ms 12144 KB Output is correct
89 Correct 191 ms 12136 KB Output is correct
90 Correct 228 ms 12140 KB Output is correct
91 Correct 223 ms 12116 KB Output is correct
92 Correct 226 ms 12148 KB Output is correct