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Submission #499824

# Submission time Handle Problem Language Result Execution time Memory
499824 2021-12-29T15:49:43 Z Hi_Im_Not_Meo_Meo Mecho (IOI09_mecho) C++14
100 / 100
 175 ms 6744 KB 
#include"bits/stdc++.h"
#define f(i,j,k) for(int i=j;i<=k;i++)
#define fi first
#define se second
#define mp make_pair

const int N = 808;
const int oo = 2e9;
const int C[] = {0,1,0,-1,0};
using namespace std;
using pii = pair<int,int>;
int n, s;
int f[N][N], cx[N][N];
char a[N][N];
pii st, ed;

struct dota{
	int x, y, tim;
};

bool check(int t){
    queue<dota> q;
    memset(cx,0,sizeof(cx));
    f(i,1,n) f(j,1,n) if(a[i][j] != 'T') cx[i][j] = 1;
    q.push({st.fi,st.se,0});
    cx[st.fi][st.se] = 0;
    while(q.size()){
        dota td = q.front(); q.pop();
        int x = td.x;
        int y = td.y;
        int tim = td.tim;
        //if(t == 1) cout<<x<<" "<<y<<" "<<tim<<endl;
        if(x == ed.fi && y == ed.se) return true;
        f(i,0,3){
        	int u = x + C[i];
        	int v = y + C[i+1];
            if(cx[u][v] && (tim + 1)/s < f[u][v]-t){
             	q.push({u,v,tim+1});
             	cx[u][v] = 0;
        	}
        }
        
    }
    return false;
}

main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>s;
	f(i,1,n) f(j,1,n) cin>>a[i][j];
	queue<pii> q;
	memset(cx,0,sizeof(cx));
	f(i,0,n) cx[i][0] = cx[0][i] = cx[i][n+1] = cx[n+1][i] = 1; 
	f(i,1,n) f(j,1,n){
		if(a[i][j] == 'T') cx[i][j] = 1;
		if(a[i][j] == 'H'){
			cx[i][j] = 1;
		 	q.push({i,j});
		 	f[i][j] = 0;
		}
		if(a[i][j] == 'D') ed = mp(i,j), cx[i][j] = 1;
		if(a[i][j] == 'M') st = mp(i,j);
	}
	while(q.size()){
		pii td = q.front(); q.pop();
		int x = td.fi, y = td.se;
		f(i,0,3){
			int u = x + C[i];
			int v = y + C[i+1];
			if(!cx[u][v]){
				f[u][v] = f[x][y]+1;
				cx[u][v] = true;
				q.push({u,v});
			}
		}
	}
	//cout<<"vcl";
	f[ed.fi][ed.se] = oo;
//	f(i,1,n){
//		f(j,1,n) cout<<f[i][j]<<" ";
//		cout<<endl;
//	}
	int l = 0, r = f[st.fi][st.se]-1, mid, ans = -1;
	while(l <= r){
		//cout<<l<<" "<<r<<" "<<mid<<endl;
		mid = (l+r)/2;
		if(check(mid)) ans = mid,l = mid+1;
		else r = mid-1;
	}
	cout<<ans;
}

Compilation message

mecho.cpp:47:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   47 | main(){
      | ^~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2892 KB Output is correct
2 Correct 2 ms 2880 KB Output is correct
3 Correct 2 ms 2884 KB Output is correct
4 Correct 1 ms 2892 KB Output is correct
5 Correct 2 ms 2880 KB Output is correct
6 Correct 2 ms 2892 KB Output is correct
7 Correct 73 ms 6544 KB Output is correct
8 Correct 2 ms 2892 KB Output is correct
9 Correct 2 ms 2892 KB Output is correct
10 Correct 2 ms 2892 KB Output is correct
11 Correct 2 ms 2892 KB Output is correct
12 Correct 2 ms 3020 KB Output is correct
13 Correct 2 ms 3020 KB Output is correct
14 Correct 3 ms 3020 KB Output is correct
15 Correct 2 ms 2892 KB Output is correct
16 Correct 3 ms 2872 KB Output is correct
17 Correct 2 ms 2888 KB Output is correct
18 Correct 2 ms 2884 KB Output is correct
19 Correct 2 ms 2884 KB Output is correct
20 Correct 2 ms 2892 KB Output is correct
21 Correct 2 ms 3008 KB Output is correct
22 Correct 2 ms 3004 KB Output is correct
23 Correct 3 ms 3020 KB Output is correct
24 Correct 2 ms 3020 KB Output is correct
25 Correct 3 ms 3020 KB Output is correct
26 Correct 3 ms 3008 KB Output is correct
27 Correct 2 ms 3136 KB Output is correct
28 Correct 2 ms 3148 KB Output is correct
29 Correct 3 ms 3148 KB Output is correct
30 Correct 2 ms 3148 KB Output is correct
31 Correct 2 ms 3148 KB Output is correct
32 Correct 2 ms 3148 KB Output is correct
33 Correct 7 ms 4268 KB Output is correct
34 Correct 7 ms 4300 KB Output is correct
35 Correct 15 ms 4376 KB Output is correct
36 Correct 8 ms 4524 KB Output is correct
37 Correct 8 ms 4524 KB Output is correct
38 Correct 25 ms 4556 KB Output is correct
39 Correct 10 ms 4828 KB Output is correct
40 Correct 14 ms 4800 KB Output is correct
41 Correct 25 ms 4868 KB Output is correct
42 Correct 13 ms 5096 KB Output is correct
43 Correct 12 ms 5068 KB Output is correct
44 Correct 32 ms 5032 KB Output is correct
45 Correct 13 ms 5220 KB Output is correct
46 Correct 13 ms 5308 KB Output is correct
47 Correct 41 ms 5248 KB Output is correct
48 Correct 15 ms 5452 KB Output is correct
49 Correct 16 ms 5516 KB Output is correct
50 Correct 58 ms 5572 KB Output is correct
51 Correct 18 ms 5800 KB Output is correct
52 Correct 16 ms 5760 KB Output is correct
53 Correct 50 ms 5816 KB Output is correct
54 Correct 20 ms 5964 KB Output is correct
55 Correct 18 ms 5984 KB Output is correct
56 Correct 58 ms 6040 KB Output is correct
57 Correct 22 ms 6216 KB Output is correct
58 Correct 22 ms 6180 KB Output is correct
59 Correct 76 ms 6256 KB Output is correct
60 Correct 26 ms 6460 KB Output is correct
61 Correct 25 ms 6352 KB Output is correct
62 Correct 79 ms 6492 KB Output is correct
63 Correct 98 ms 6472 KB Output is correct
64 Correct 175 ms 6480 KB Output is correct
65 Correct 148 ms 6472 KB Output is correct
66 Correct 119 ms 6472 KB Output is correct
67 Correct 141 ms 6480 KB Output is correct
68 Correct 73 ms 6508 KB Output is correct
69 Correct 56 ms 6500 KB Output is correct
70 Correct 50 ms 6496 KB Output is correct
71 Correct 60 ms 6496 KB Output is correct
72 Correct 61 ms 6500 KB Output is correct
73 Correct 34 ms 6732 KB Output is correct
74 Correct 48 ms 6720 KB Output is correct
75 Correct 46 ms 6744 KB Output is correct
76 Correct 50 ms 6744 KB Output is correct
77 Correct 61 ms 6732 KB Output is correct
78 Correct 53 ms 6716 KB Output is correct
79 Correct 43 ms 6596 KB Output is correct
80 Correct 47 ms 6596 KB Output is correct
81 Correct 50 ms 6592 KB Output is correct
82 Correct 51 ms 6720 KB Output is correct
83 Correct 57 ms 6676 KB Output is correct
84 Correct 51 ms 6584 KB Output is correct
85 Correct 52 ms 6632 KB Output is correct
86 Correct 62 ms 6672 KB Output is correct
87 Correct 49 ms 6584 KB Output is correct
88 Correct 56 ms 6628 KB Output is correct
89 Correct 57 ms 6592 KB Output is correct
90 Correct 62 ms 6628 KB Output is correct
91 Correct 74 ms 6544 KB Output is correct
92 Correct 68 ms 6628 KB Output is correct