답안 #953990

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
953990	2024-03-27T04:04:46 Z	Github	Mecho (IOI09_mecho)	C++17	98 / 100	150 ms	12636 KB

mecho

#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;
            if (b1){
                continue;
            }
            bool b2 = grid[nX][nY] == 'T' || grid[nX][nY] == 'H' || grid[nX][nY] == 'D';
            if (b2){
                continue;
            }
            /*if (nX < 0 || nX >= n || nY < 0 || nY >= n || grid[nX][nY] == 'T' || grid[nX][nY] == 'H' || grid[nX][nY] == 'D'){
                continue;
            }*/
            ll cur_time = (dist[x][y] + 1) / s;
            if (!vis[nX][nY]) {
                if ((dist[nX][nY] > dist[x][y] + 1) && ((bee[nX][nY] - k) > cur_time)) {
                    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;
        if (b1) {
            continue;
        }
        bool b2 = grid[nX][nY] == 'T' || grid[nX][nY] == 'H';
        if (b2){
            continue;
        }
        /*if (nX < 0 || nX >= n || nY < 0 || nY >= n || grid[nX][nY] == 'T' || grid[nX][nY] == 'H') {
            continue;
        }*/
        ll cur_time = dist[nX][nY]/s;
        if ((bee[nX][nY]-k) > cur_time){
            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];
            bool b1 = nX < 0 || nX >= n || nY < 0 || nY >= n;
            if (b1){
                continue;
            }
            bool b2 = grid[nX][nY] == 'T' || grid[nX][nY] == 'D';
            if (b2){
                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 = n*n, 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	3 ms	11356 KB	Output is correct
2	Correct	3 ms	11352 KB	Output is correct
3	Correct	6 ms	11512 KB	Output is correct
4	Correct	5 ms	11356 KB	Output is correct
5	Incorrect	3 ms	11356 KB	Output isn't correct
6	Correct	3 ms	11352 KB	Output is correct
7	Correct	70 ms	12120 KB	Output is correct
8	Correct	3 ms	11356 KB	Output is correct
9	Correct	3 ms	11356 KB	Output is correct
10	Correct	3 ms	11352 KB	Output is correct
11	Correct	2 ms	11356 KB	Output is correct
12	Correct	3 ms	11356 KB	Output is correct
13	Correct	2 ms	11356 KB	Output is correct
14	Correct	4 ms	11352 KB	Output is correct
15	Correct	4 ms	11352 KB	Output is correct
16	Correct	3 ms	11356 KB	Output is correct
17	Correct	4 ms	11356 KB	Output is correct
18	Correct	3 ms	11356 KB	Output is correct
19	Correct	4 ms	11356 KB	Output is correct
20	Correct	3 ms	11352 KB	Output is correct
21	Correct	4 ms	11356 KB	Output is correct
22	Correct	4 ms	11356 KB	Output is correct
23	Correct	4 ms	11356 KB	Output is correct
24	Correct	4 ms	11352 KB	Output is correct
25	Correct	5 ms	11356 KB	Output is correct
26	Correct	4 ms	11356 KB	Output is correct
27	Correct	4 ms	11352 KB	Output is correct
28	Correct	5 ms	11356 KB	Output is correct
29	Correct	4 ms	11608 KB	Output is correct
30	Correct	4 ms	11356 KB	Output is correct
31	Correct	4 ms	11356 KB	Output is correct
32	Correct	5 ms	11356 KB	Output is correct
33	Correct	9 ms	11356 KB	Output is correct
34	Correct	7 ms	11356 KB	Output is correct
35	Correct	21 ms	11516 KB	Output is correct
36	Correct	10 ms	11356 KB	Output is correct
37	Correct	8 ms	11356 KB	Output is correct
38	Correct	25 ms	11556 KB	Output is correct
39	Correct	8 ms	11356 KB	Output is correct
40	Correct	8 ms	11356 KB	Output is correct
41	Correct	33 ms	11612 KB	Output is correct
42	Correct	10 ms	11808 KB	Output is correct
43	Correct	10 ms	11612 KB	Output is correct
44	Correct	37 ms	11640 KB	Output is correct
45	Correct	11 ms	11612 KB	Output is correct
46	Correct	11 ms	11868 KB	Output is correct
47	Correct	39 ms	11612 KB	Output is correct
48	Correct	14 ms	11612 KB	Output is correct
49	Correct	11 ms	11608 KB	Output is correct
50	Correct	55 ms	11612 KB	Output is correct
51	Correct	13 ms	11608 KB	Output is correct
52	Correct	13 ms	11612 KB	Output is correct
53	Correct	65 ms	11852 KB	Output is correct
54	Correct	15 ms	11868 KB	Output is correct
55	Correct	14 ms	11868 KB	Output is correct
56	Correct	85 ms	11864 KB	Output is correct
57	Correct	15 ms	11864 KB	Output is correct
58	Correct	16 ms	11868 KB	Output is correct
59	Correct	86 ms	11980 KB	Output is correct
60	Correct	16 ms	11864 KB	Output is correct
61	Correct	23 ms	11868 KB	Output is correct
62	Correct	92 ms	11868 KB	Output is correct
63	Correct	85 ms	11860 KB	Output is correct
64	Correct	150 ms	11868 KB	Output is correct
65	Correct	128 ms	12068 KB	Output is correct
66	Correct	100 ms	11868 KB	Output is correct
67	Correct	87 ms	11868 KB	Output is correct
68	Correct	37 ms	12120 KB	Output is correct
69	Correct	36 ms	12108 KB	Output is correct
70	Correct	29 ms	11856 KB	Output is correct
71	Correct	34 ms	12124 KB	Output is correct
72	Correct	25 ms	12124 KB	Output is correct
73	Correct	24 ms	12636 KB	Output is correct
74	Correct	42 ms	12604 KB	Output is correct
75	Correct	65 ms	12636 KB	Output is correct
76	Correct	51 ms	12636 KB	Output is correct
77	Correct	47 ms	12636 KB	Output is correct
78	Correct	72 ms	12564 KB	Output is correct
79	Correct	38 ms	12632 KB	Output is correct
80	Correct	49 ms	12568 KB	Output is correct
81	Correct	56 ms	12376 KB	Output is correct
82	Correct	48 ms	12380 KB	Output is correct
83	Correct	65 ms	12380 KB	Output is correct
84	Correct	52 ms	12380 KB	Output is correct
85	Correct	62 ms	12508 KB	Output is correct
86	Correct	67 ms	12376 KB	Output is correct
87	Correct	61 ms	12484 KB	Output is correct
88	Correct	65 ms	12400 KB	Output is correct
89	Correct	62 ms	12412 KB	Output is correct
90	Correct	65 ms	12376 KB	Output is correct
91	Correct	58 ms	12376 KB	Output is correct
92	Correct	89 ms	12380 KB	Output is correct