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Submission #499627

# Submission time Handle Problem Language Result Execution time Memory
499627 2021-12-29T05:49:29 Z _AnKahng Mecho (IOI09_mecho) C++14
100 / 100
 134 ms 4576 KB 
#include<bits/stdc++.h>
#define fi first
#define sc second
#define fr(i,a,b) for(int i=a;i<=b;i++)
#define fo(i,a,b) for(int i=a;i<=b;i++)
using namespace std;

const int H[] = {-1,-1,1,1};
const int M = 805;
int n,s,f[M][M];
bool cx[M][M];
pair<int,int> st,fn;
string a[M];
struct dota{
    int x,y,d;
};

void BFS_hive(){
    queue<dota> q;
    memset(cx,false,sizeof(cx));
    fo(i,1,n)
        fo(j,1,n) {
            if(a[i][j] != 'T') cx[i][j] = true;
            if(a[i][j] == 'H') q.push({i,j,0}), f[i][j] = 0, cx[i][j] = false;
            if(a[i][j] == 'D') cx[i][j] = false;
        }
    while(!q.empty()){
        int x = q.front().x, y = q.front().y, d = q.front().d;
        q.pop();
        f[x][y] = d;
        int xi,yi;
        fo(k,0,3){
            if(k % 2) xi = x + H[k], yi = y;
            else xi = x, yi = y + H[k];
            if(cx[xi][yi]) q.push({xi,yi,d+1}), cx[xi][yi] = false;
        }
    }
}

bool check(int t){
    queue<dota> q;
    memset(cx,false,sizeof(cx));
    fo(i,1,n)
        fo(j,1,n) if(a[i][j] != 'T') cx[i][j] = true;
    q.push({st.fi,st.sc,0});
    cx[st.fi][st.sc] = false;
    while(!q.empty()){
        int x = q.front().x, y = q.front().y, d = q.front().d;
        q.pop();
        if(x == fn.fi && y == fn.sc) return true;
        int xi,yi;
        fo(k,0,3){
            if(k % 2) xi = x + H[k], yi = y;
            else xi = x, yi = y + H[k];
            if(cx[xi][yi] && (d + 1) / s < f[xi][yi] - t) q.push({xi,yi,d+1}), cx[xi][yi] = false;
        }
    }
    return false;
}

int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    cin >> n >> s;
    fo(i,1,n) cin >> a[i], a[i] = "*" + a[i];
    fo(i,1,n)
        fo(j,1,n)
            if(a[i][j] == 'M') st = {i,j};
            else if(a[i][j] == 'D') fn = {i,j};
    BFS_hive();
    f[fn.fi][fn.sc] = INT_MAX;
    int l = 0, r = f[st.fi][st.sc]-1, mid,res=-1;
    while(l <= r){
        mid = (l + r) / 2;
        if(check(mid)) l = mid+1, res = mid;
        else r = mid-1;
    }
    cout << res;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 972 KB Output is correct
2 Correct 1 ms 972 KB Output is correct
3 Correct 1 ms 972 KB Output is correct
4 Correct 1 ms 972 KB Output is correct
5 Correct 1 ms 972 KB Output is correct
6 Correct 1 ms 972 KB Output is correct
7 Correct 53 ms 4320 KB Output is correct
8 Correct 1 ms 972 KB Output is correct
9 Correct 1 ms 972 KB Output is correct
10 Correct 1 ms 972 KB Output is correct
11 Correct 1 ms 972 KB Output is correct
12 Correct 1 ms 1100 KB Output is correct
13 Correct 1 ms 1100 KB Output is correct
14 Correct 1 ms 1100 KB Output is correct
15 Correct 1 ms 972 KB Output is correct
16 Correct 1 ms 972 KB Output is correct
17 Correct 1 ms 972 KB Output is correct
18 Correct 1 ms 972 KB Output is correct
19 Correct 1 ms 972 KB Output is correct
20 Correct 1 ms 972 KB Output is correct
21 Correct 1 ms 1100 KB Output is correct
22 Correct 1 ms 1100 KB Output is correct
23 Correct 1 ms 1100 KB Output is correct
24 Correct 1 ms 1100 KB Output is correct
25 Correct 1 ms 1100 KB Output is correct
26 Correct 1 ms 1100 KB Output is correct
27 Correct 1 ms 1100 KB Output is correct
28 Correct 1 ms 1100 KB Output is correct
29 Correct 1 ms 1100 KB Output is correct
30 Correct 1 ms 1100 KB Output is correct
31 Correct 1 ms 1228 KB Output is correct
32 Correct 1 ms 1228 KB Output is correct
33 Correct 4 ms 2124 KB Output is correct
34 Correct 5 ms 2124 KB Output is correct
35 Correct 12 ms 2224 KB Output is correct
36 Correct 5 ms 2380 KB Output is correct
37 Correct 5 ms 2380 KB Output is correct
38 Correct 15 ms 2420 KB Output is correct
39 Correct 6 ms 2500 KB Output is correct
40 Correct 6 ms 2508 KB Output is correct
41 Correct 20 ms 2628 KB Output is correct
42 Correct 7 ms 2788 KB Output is correct
43 Correct 7 ms 2764 KB Output is correct
44 Correct 26 ms 2816 KB Output is correct
45 Correct 8 ms 3036 KB Output is correct
46 Correct 8 ms 3020 KB Output is correct
47 Correct 31 ms 3024 KB Output is correct
48 Correct 9 ms 3148 KB Output is correct
49 Correct 10 ms 3176 KB Output is correct
50 Correct 37 ms 3148 KB Output is correct
51 Correct 11 ms 3404 KB Output is correct
52 Correct 11 ms 3404 KB Output is correct
53 Correct 49 ms 3484 KB Output is correct
54 Correct 12 ms 3704 KB Output is correct
55 Correct 13 ms 3660 KB Output is correct
56 Correct 54 ms 3696 KB Output is correct
57 Correct 15 ms 3880 KB Output is correct
58 Correct 15 ms 3936 KB Output is correct
59 Correct 59 ms 3932 KB Output is correct
60 Correct 16 ms 4044 KB Output is correct
61 Correct 17 ms 4172 KB Output is correct
62 Correct 68 ms 4172 KB Output is correct
63 Correct 95 ms 4152 KB Output is correct
64 Correct 134 ms 4044 KB Output is correct
65 Correct 132 ms 4100 KB Output is correct
66 Correct 101 ms 4172 KB Output is correct
67 Correct 94 ms 4172 KB Output is correct
68 Correct 51 ms 4172 KB Output is correct
69 Correct 45 ms 4172 KB Output is correct
70 Correct 43 ms 4204 KB Output is correct
71 Correct 40 ms 4196 KB Output is correct
72 Correct 42 ms 4088 KB Output is correct
73 Correct 25 ms 4556 KB Output is correct
74 Correct 42 ms 4492 KB Output is correct
75 Correct 40 ms 4576 KB Output is correct
76 Correct 41 ms 4576 KB Output is correct
77 Correct 43 ms 4556 KB Output is correct
78 Correct 44 ms 4552 KB Output is correct
79 Correct 38 ms 4492 KB Output is correct
80 Correct 41 ms 4428 KB Output is correct
81 Correct 44 ms 4500 KB Output is correct
82 Correct 40 ms 4468 KB Output is correct
83 Correct 55 ms 4456 KB Output is correct
84 Correct 46 ms 4428 KB Output is correct
85 Correct 47 ms 4344 KB Output is correct
86 Correct 55 ms 4444 KB Output is correct
87 Correct 45 ms 4428 KB Output is correct
88 Correct 52 ms 4396 KB Output is correct
89 Correct 50 ms 4300 KB Output is correct
90 Correct 55 ms 4320 KB Output is correct
91 Correct 54 ms 4388 KB Output is correct
92 Correct 54 ms 4380 KB Output is correct