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Submission #953977

# Submission time Handle Problem Language Result Execution time Memory
953977 2024-03-27T03:40:09 Z Github Mecho (IOI09_mecho) C++17
98 / 100
 176 ms 23172 KB 
#include <iostream>
#include <vector>
#include <queue>
#include <cstring>
#include <map>
#include <climits>
#include <cmath>
#include <algorithm>
#include <stack>
using namespace std;

#define speedup ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define ll long long

const ll MAXN = 810;
ll bee[MAXN][MAXN];
ll dist[MAXN][MAXN];
pair<ll,ll> parent[MAXN][MAXN];
bool vis[MAXN][MAXN];
ll dX[] = {1, -1, 0, 0};
ll dY[] = {0, 0, 1, -1};
pair<ll, ll> mencho, den;
vector<string> grid;
ll n, s;

bool compute(ll k){
    if (k >= bee[mencho.first][mencho.second]){
        return false;
    }
    for (ll i = 0; i < MAXN; i++){
        for (ll j = 0; j < MAXN; j++){
            dist[i][j] = 1e9;
            parent[i][j] = {-1, -1};
            vis[i][j] = false;
        }
    }
    queue<pair<ll, ll>> q;
    q.push(mencho);
    dist[mencho.first][mencho.second] = 0;
    while (!q.empty()){
        ll x = q.front().first, y = q.front().second; q.pop();
        vis[x][y] = true;
        if (make_pair(x, y) == den){
            break;
        }
        for (ll i = 0; i < 4; i++){
            ll nX = x + dX[i], nY = y+dY[i];
            if (nX < 0 || nX >= n || nY < 0 || nY >= n){
                continue;
            }
            if (grid[nX][nY] == 'T' || grid[nX][nY] == 'H' || grid[nX][nY] == 'D'){
                continue;
            }
            if (dist[nX][nY] > dist[x][y]+1 && !vis[nX][nY] && (bee[nX][nY]-k) > (dist[x][y]+1)/s){
                dist[nX][nY] = dist[x][y]+1;
                parent[nX][nY] = {x, y};
                q.push({nX, nY});
            }
        }
    }
    for (int i = 0; i < 4; i++){
        ll nX = den.first+dX[i], nY = den.second+dY[i];
        //bool b1 = nX < 0 || nX >= n || nY < 0 || nY >= n, b2 = grid[nX][nY] == 'T' || grid[nX][nY] == 'H';
        if (nX < 0 || nX >= n || nY < 0 || nY >= n) {
            continue;
        }
        if (grid[nX][nY] == 'T' || grid[nX][nY] == 'H'){
            continue;
        }
        if ((bee[nX][nY]-k) > (dist[nX][nY])/s){
            return true;
        }
    }
    return false;
}

int main() {
    speedup
    cin >> n >> s;
    grid.resize(n);
    vector<pair<ll, ll>> start;
    for (ll i = 0; i < n; i++){
        string st; cin >> st;
        grid[i] = st;
        for (ll j = 0; j < n; j++){
            if (st[j] == 'H'){
                start.push_back({i, j});
            }else if (st[j] == 'M'){
                mencho = {i, j};
            }else if (st[j] == 'D'){
                den = {i, j};
            }
        }
    }
    for (ll i = 0; i < MAXN; i++){
        for (ll j = 0; j < MAXN; j++){
            bee[i][j] = 1e9;
            vis[i][j] = false;
        }
    }
    queue<pair<ll, ll>> q;
    for (pair<ll, ll> p: start){
        bee[p.first][p.second] = 0;
        q.push({p.first, p.second});
    }
    while (!q.empty()){
        ll x = q.front().first, y = q.front().second; q.pop();
        vis[x][y] = true;
        for (ll i = 0; i < 4; i++){
            ll nX = x + dX[i], nY = y+dY[i];
            if (nX < 0 || nX >= n || nY < 0 || nY >= n || grid[nX][nY] == 'T' || grid[nX][nY] == 'D'){
                continue;
            }
            if (bee[nX][nY] > bee[x][y]+1 && !vis[nX][nY]){
                bee[nX][nY] = bee[x][y]+1;
                q.push({nX, nY});
            }
        }
    }
    ll l = 0, h = 1e9, mid, ans = -1;
    while (l <= h){
        mid = (l+h)/2;
        if (compute(mid)){
            ans = mid;
            l = mid+1;
        }else{
            h = mid-1;
        }
    }
    cout << ans << endl;
    return 0;
}

Subtask #1
98.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 21596 KB Output is correct
2 Correct 8 ms 21884 KB Output is correct
3 Correct 5 ms 21592 KB Output is correct
4 Correct 6 ms 21592 KB Output is correct
5 Incorrect 5 ms 21596 KB Output isn't correct
6 Correct 8 ms 21592 KB Output is correct
7 Correct 137 ms 22364 KB Output is correct
8 Correct 6 ms 21596 KB Output is correct
9 Correct 6 ms 21596 KB Output is correct
10 Correct 7 ms 21596 KB Output is correct
11 Correct 5 ms 21596 KB Output is correct
12 Correct 9 ms 21596 KB Output is correct
13 Correct 4 ms 21596 KB Output is correct
14 Correct 7 ms 21596 KB Output is correct
15 Correct 8 ms 21596 KB Output is correct
16 Correct 7 ms 21596 KB Output is correct
17 Correct 12 ms 21648 KB Output is correct
18 Correct 8 ms 21596 KB Output is correct
19 Correct 10 ms 21596 KB Output is correct
20 Correct 7 ms 21640 KB Output is correct
21 Correct 10 ms 21596 KB Output is correct
22 Correct 6 ms 21648 KB Output is correct
23 Correct 8 ms 21596 KB Output is correct
24 Correct 8 ms 21596 KB Output is correct
25 Correct 11 ms 21596 KB Output is correct
26 Correct 8 ms 21596 KB Output is correct
27 Correct 8 ms 21596 KB Output is correct
28 Correct 7 ms 21592 KB Output is correct
29 Correct 11 ms 21592 KB Output is correct
30 Correct 10 ms 21596 KB Output is correct
31 Correct 12 ms 21652 KB Output is correct
32 Correct 9 ms 21844 KB Output is correct
33 Correct 17 ms 21592 KB Output is correct
34 Correct 13 ms 21596 KB Output is correct
35 Correct 31 ms 21596 KB Output is correct
36 Correct 13 ms 21592 KB Output is correct
37 Correct 12 ms 21596 KB Output is correct
38 Correct 39 ms 21836 KB Output is correct
39 Correct 17 ms 21848 KB Output is correct
40 Correct 13 ms 21872 KB Output is correct
41 Correct 47 ms 21852 KB Output is correct
42 Correct 12 ms 21848 KB Output is correct
43 Correct 10 ms 21852 KB Output is correct
44 Correct 61 ms 21852 KB Output is correct
45 Correct 19 ms 22004 KB Output is correct
46 Correct 16 ms 21852 KB Output is correct
47 Correct 76 ms 21968 KB Output is correct
48 Correct 21 ms 22024 KB Output is correct
49 Correct 22 ms 21852 KB Output is correct
50 Correct 89 ms 22040 KB Output is correct
51 Correct 23 ms 22104 KB Output is correct
52 Correct 20 ms 22108 KB Output is correct
53 Correct 111 ms 22108 KB Output is correct
54 Correct 25 ms 22104 KB Output is correct
55 Correct 24 ms 22108 KB Output is correct
56 Correct 119 ms 22172 KB Output is correct
57 Correct 21 ms 22064 KB Output is correct
58 Correct 21 ms 22232 KB Output is correct
59 Correct 150 ms 22244 KB Output is correct
60 Correct 21 ms 22108 KB Output is correct
61 Correct 22 ms 22308 KB Output is correct
62 Correct 156 ms 22108 KB Output is correct
63 Correct 110 ms 22328 KB Output is correct
64 Correct 176 ms 22324 KB Output is correct
65 Correct 174 ms 22324 KB Output is correct
66 Correct 121 ms 22104 KB Output is correct
67 Correct 103 ms 22108 KB Output is correct
68 Correct 53 ms 22380 KB Output is correct
69 Correct 48 ms 22360 KB Output is correct
70 Correct 32 ms 22360 KB Output is correct
71 Correct 35 ms 22360 KB Output is correct
72 Correct 30 ms 22364 KB Output is correct
73 Correct 36 ms 22868 KB Output is correct
74 Correct 60 ms 22840 KB Output is correct
75 Correct 71 ms 23172 KB Output is correct
76 Correct 57 ms 22936 KB Output is correct
77 Correct 66 ms 22872 KB Output is correct
78 Correct 68 ms 22616 KB Output is correct
79 Correct 56 ms 22836 KB Output is correct
80 Correct 57 ms 22608 KB Output is correct
81 Correct 73 ms 22620 KB Output is correct
82 Correct 58 ms 22840 KB Output is correct
83 Correct 105 ms 22756 KB Output is correct
84 Correct 102 ms 22764 KB Output is correct
85 Correct 91 ms 22756 KB Output is correct
86 Correct 95 ms 22764 KB Output is correct
87 Correct 101 ms 22764 KB Output is correct
88 Correct 131 ms 22660 KB Output is correct
89 Correct 98 ms 22652 KB Output is correct
90 Correct 109 ms 22616 KB Output is correct
91 Correct 107 ms 22620 KB Output is correct
92 Correct 124 ms 22864 KB Output is correct