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답안 #953985

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
953985 2024-03-27T03:49:19 Z Github Mecho (IOI09_mecho) C++17
98 / 100
 195 ms 22916 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];
            /*bool b1 = nX < 0 || nX >= n || nY < 0 || nY >= n, b2 = grid[nX][nY] == 'T' || grid[nX][nY] == 'H' || grid[nX][nY] == 'D';
            if (b1 || b2){
                continue;
            }*/
            if (nX < 0 || nX >= n || nY < 0 || nY >= n || 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 (b1 || b2) {
            continue;
        }*/
        if (nX < 0 || nX >= n || nY < 0 || nY >= n || 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

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 21596 KB Output is correct
2 Correct 6 ms 21596 KB Output is correct
3 Correct 5 ms 21596 KB Output is correct
4 Correct 7 ms 21596 KB Output is correct
5 Incorrect 5 ms 21452 KB Output isn't correct
6 Correct 6 ms 21592 KB Output is correct
7 Correct 99 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 21640 KB Output is correct
11 Correct 4 ms 21592 KB Output is correct
12 Correct 8 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 21644 KB Output is correct
17 Correct 9 ms 21596 KB Output is correct
18 Correct 7 ms 21624 KB Output is correct
19 Correct 9 ms 21596 KB Output is correct
20 Correct 7 ms 21624 KB Output is correct
21 Correct 11 ms 21596 KB Output is correct
22 Correct 7 ms 21632 KB Output is correct
23 Correct 9 ms 21596 KB Output is correct
24 Correct 8 ms 21596 KB Output is correct
25 Correct 10 ms 21592 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 21596 KB Output is correct
29 Correct 10 ms 21648 KB Output is correct
30 Correct 10 ms 21592 KB Output is correct
31 Correct 13 ms 21592 KB Output is correct
32 Correct 9 ms 21592 KB Output is correct
33 Correct 18 ms 21596 KB Output is correct
34 Correct 13 ms 21592 KB Output is correct
35 Correct 30 ms 21596 KB Output is correct
36 Correct 12 ms 21596 KB Output is correct
37 Correct 12 ms 21596 KB Output is correct
38 Correct 38 ms 21592 KB Output is correct
39 Correct 16 ms 21852 KB Output is correct
40 Correct 12 ms 21852 KB Output is correct
41 Correct 44 ms 21852 KB Output is correct
42 Correct 12 ms 21852 KB Output is correct
43 Correct 10 ms 21932 KB Output is correct
44 Correct 66 ms 21908 KB Output is correct
45 Correct 18 ms 21852 KB Output is correct
46 Correct 14 ms 21848 KB Output is correct
47 Correct 105 ms 21976 KB Output is correct
48 Correct 20 ms 21848 KB Output is correct
49 Correct 19 ms 21852 KB Output is correct
50 Correct 82 ms 22040 KB Output is correct
51 Correct 21 ms 22120 KB Output is correct
52 Correct 22 ms 22364 KB Output is correct
53 Correct 102 ms 22108 KB Output is correct
54 Correct 26 ms 22108 KB Output is correct
55 Correct 26 ms 22108 KB Output is correct
56 Correct 123 ms 22172 KB Output is correct
57 Correct 20 ms 22108 KB Output is correct
58 Correct 14 ms 22108 KB Output is correct
59 Correct 152 ms 22244 KB Output is correct
60 Correct 21 ms 22104 KB Output is correct
61 Correct 22 ms 22332 KB Output is correct
62 Correct 161 ms 22108 KB Output is correct
63 Correct 105 ms 22360 KB Output is correct
64 Correct 195 ms 22352 KB Output is correct
65 Correct 166 ms 22108 KB Output is correct
66 Correct 116 ms 22328 KB Output is correct
67 Correct 104 ms 22108 KB Output is correct
68 Correct 49 ms 22380 KB Output is correct
69 Correct 46 ms 22360 KB Output is correct
70 Correct 31 ms 22360 KB Output is correct
71 Correct 40 ms 22360 KB Output is correct
72 Correct 28 ms 22364 KB Output is correct
73 Correct 33 ms 22884 KB Output is correct
74 Correct 59 ms 22880 KB Output is correct
75 Correct 80 ms 22876 KB Output is correct
76 Correct 61 ms 22872 KB Output is correct
77 Correct 73 ms 22916 KB Output is correct
78 Correct 63 ms 22844 KB Output is correct
79 Correct 56 ms 22840 KB Output is correct
80 Correct 61 ms 22616 KB Output is correct
81 Correct 64 ms 22616 KB Output is correct
82 Correct 58 ms 22852 KB Output is correct
83 Correct 93 ms 22616 KB Output is correct
84 Correct 96 ms 22764 KB Output is correct
85 Correct 92 ms 22764 KB Output is correct
86 Correct 85 ms 22620 KB Output is correct
87 Correct 88 ms 22752 KB Output is correct
88 Correct 111 ms 22748 KB Output is correct
89 Correct 105 ms 22616 KB Output is correct
90 Correct 103 ms 22652 KB Output is correct
91 Correct 105 ms 22656 KB Output is correct
92 Correct 99 ms 22640 KB Output is correct