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Submission #499813

# Submission time Handle Problem Language Result Execution time Memory
499813 2021-12-29T15:28:54 Z Hi_Im_Not_Meo_Meo Mecho (IOI09_mecho) C++14
84 / 100
 203 ms 6884 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);
		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});
			}
		}
	}
	
	f[ed.fi][ed.se] = oo;
	//f(i,1,n){
	//	f(j,1,n) cout<<f[i][j]<<" ";
	//	cout<<endl;
	//}
	int l = 0, r = oo, mid, ans = -1;
	while(l <= r){
		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
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2892 KB Output is correct
2 Correct 3 ms 2892 KB Output is correct
3 Correct 3 ms 2892 KB Output is correct
4 Correct 4 ms 2892 KB Output is correct
5 Correct 3 ms 2892 KB Output is correct
6 Correct 4 ms 2892 KB Output is correct
7 Correct 67 ms 6616 KB Output is correct
8 Correct 3 ms 2884 KB Output is correct
9 Correct 3 ms 2888 KB Output is correct
10 Correct 4 ms 2884 KB Output is correct
11 Correct 3 ms 2892 KB Output is correct
12 Incorrect 2 ms 3020 KB Output isn't correct
13 Incorrect 3 ms 3020 KB Output isn't correct
14 Correct 5 ms 3020 KB Output is correct
15 Correct 4 ms 2892 KB Output is correct
16 Correct 4 ms 2876 KB Output is correct
17 Correct 4 ms 2880 KB Output is correct
18 Correct 3 ms 2924 KB Output is correct
19 Correct 4 ms 3020 KB Output is correct
20 Correct 3 ms 2892 KB Output is correct
21 Correct 5 ms 3020 KB Output is correct
22 Correct 3 ms 3020 KB Output is correct
23 Correct 3 ms 3012 KB Output is correct
24 Correct 4 ms 3020 KB Output is correct
25 Correct 4 ms 3020 KB Output is correct
26 Correct 4 ms 3004 KB Output is correct
27 Correct 5 ms 3148 KB Output is correct
28 Correct 4 ms 3148 KB Output is correct
29 Correct 4 ms 3148 KB Output is correct
30 Correct 3 ms 3148 KB Output is correct
31 Correct 3 ms 3144 KB Output is correct
32 Correct 4 ms 3148 KB Output is correct
33 Correct 9 ms 4300 KB Output is correct
34 Correct 9 ms 4296 KB Output is correct
35 Correct 21 ms 4392 KB Output is correct
36 Correct 12 ms 4556 KB Output is correct
37 Correct 11 ms 4556 KB Output is correct
38 Correct 25 ms 4556 KB Output is correct
39 Correct 13 ms 4816 KB Output is correct
40 Correct 13 ms 4848 KB Output is correct
41 Correct 30 ms 4860 KB Output is correct
42 Correct 14 ms 5068 KB Output is correct
43 Correct 14 ms 5068 KB Output is correct
44 Correct 37 ms 5068 KB Output is correct
45 Correct 16 ms 5320 KB Output is correct
46 Correct 18 ms 5356 KB Output is correct
47 Correct 47 ms 5344 KB Output is correct
48 Correct 21 ms 5548 KB Output is correct
49 Correct 20 ms 5572 KB Output is correct
50 Correct 52 ms 5592 KB Output is correct
51 Correct 21 ms 5840 KB Output is correct
52 Correct 21 ms 5804 KB Output is correct
53 Correct 73 ms 5920 KB Output is correct
54 Correct 24 ms 6084 KB Output is correct
55 Correct 25 ms 6044 KB Output is correct
56 Correct 71 ms 6108 KB Output is correct
57 Correct 26 ms 6344 KB Output is correct
58 Correct 28 ms 6348 KB Output is correct
59 Correct 86 ms 6356 KB Output is correct
60 Correct 38 ms 6596 KB Output is correct
61 Correct 30 ms 6528 KB Output is correct
62 Correct 89 ms 6584 KB Output is correct
63 Correct 153 ms 6504 KB Output is correct
64 Correct 203 ms 6600 KB Output is correct
65 Correct 197 ms 6592 KB Output is correct
66 Correct 165 ms 6600 KB Output is correct
67 Correct 162 ms 6592 KB Output is correct
68 Correct 121 ms 6620 KB Output is correct
69 Correct 126 ms 6724 KB Output is correct
70 Correct 111 ms 6596 KB Output is correct
71 Correct 109 ms 6608 KB Output is correct
72 Incorrect 110 ms 6620 KB Output isn't correct
73 Incorrect 42 ms 6852 KB Output isn't correct
74 Correct 60 ms 6876 KB Output is correct
75 Correct 67 ms 6864 KB Output is correct
76 Correct 56 ms 6868 KB Output is correct
77 Correct 61 ms 6884 KB Output is correct
78 Correct 59 ms 6724 KB Output is correct
79 Correct 52 ms 6844 KB Output is correct
80 Correct 54 ms 6748 KB Output is correct
81 Correct 60 ms 6852 KB Output is correct
82 Correct 53 ms 6856 KB Output is correct
83 Correct 65 ms 6744 KB Output is correct
84 Correct 60 ms 6796 KB Output is correct
85 Correct 58 ms 6720 KB Output is correct
86 Correct 64 ms 6740 KB Output is correct
87 Correct 69 ms 6808 KB Output is correct
88 Correct 67 ms 6748 KB Output is correct
89 Correct 69 ms 6752 KB Output is correct
90 Correct 68 ms 6724 KB Output is correct
91 Correct 63 ms 6736 KB Output is correct
92 Correct 65 ms 6752 KB Output is correct