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Submission #151332

# Submission time Handle Problem Language Result Execution time Memory
151332 2019-09-02T13:14:55 Z GioChkhaidze Mecho (IOI09_mecho) C++14
100 / 100
 293 ms 7040 KB 
#include <bits/stdc++.h> 
#define F first
#define S second
using namespace std;
const int N=805;
int n,ANS=-1,k,Timer[N][N],F[N][N];
char c[N][N];
pair < int , int > a[6],Home,Honeypot;
vector < pair < int , int > > Hive;
void Bfs () {
	queue < pair < int , int > > q;
	for (int i=1; i<=n; i++)
		for (int j=1; j<=n; j++)
			Timer[i][j]=1e9;
	
	for (int i=0; i<Hive.size(); i++) 
		q.push(Hive[i]),Timer[Hive[i].F][Hive[i].S]=0;
	
	while (!q.empty()) {
		pair < int , int > B=q.front();
		q.pop();
		for (int i=1; i<=4; i++) {
			int X=B.F+a[i].F,Y=B.S+a[i].S;
			if (!(1<=X && X<=n && 1<=Y && Y<=n)) continue;
			if (c[X][Y]=='T' || c[X][Y]=='D' || Timer[X][Y]!=1e9) continue;	
			Timer[X][Y]=Timer[B.F][B.S]+k;
			q.push({X,Y});
		}
	}
}

bool check(int x) {
	if (x*k>=Timer[Honeypot.F][Honeypot.S]) return 0;
	queue < pair < pair < int , int > , int > > Q;
	while (!Q.empty()) Q.pop();
	for (int i=1; i<=n; i++)
		for (int j=1; j<=n; j++)
			F[i][j]=0;

	Q.push({{Honeypot.F,Honeypot.S},(x*k)});
	F[Honeypot.F][Honeypot.S]=1;

	while (!Q.empty()) {
		pair < int , int > D=Q.front().F;
		int timer=Q.front().S;
		Q.pop();
		if (c[D.F][D.S]=='D') return 1;
		for (int i=1; i<=4; i++) {
			int X=D.F+a[i].F,Y=D.S+a[i].S;
			if (!(1<=X && X<=n && 1<=Y && Y<=n)) continue;
			if (Timer[X][Y]<=timer+1 || F[X][Y] || c[X][Y]=='T') continue;
			Q.push({{X,Y},timer+1});
			F[X][Y]=1;
		}	
	}
	return 0;
}

main () { 
	a[1].F=1; a[1].S=0;
	a[2].F=-1; a[2].S=0;
	a[3].F=0; a[3].S=1;
	a[4].F=0; a[4].S=-1;
	
	cin>>n>>k;
	
	for (int i=1; i<=n; i++)
		for (int j=1; j<=n; j++){
			cin>>c[i][j];
			if (c[i][j]=='M') Honeypot.F=i,Honeypot.S=j;
			if (c[i][j]=='H') Hive.push_back({i,j});
			if (c[i][j]=='D') Home.F=i,Home.S=j;	
		}
	Bfs();
	int l=0,r=n*n,mid=0;
	while (l<=r) {
		mid=(l+r)/2;
		if (check(mid)) { ANS=mid; l=mid+1; }
			else r=mid-1;
	}
	cout<<ANS<<endl;
}

Compilation message

mecho.cpp: In function 'void Bfs()':
mecho.cpp:16:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<Hive.size(); i++) 
                ~^~~~~~~~~~~~
mecho.cpp: At global scope:
mecho.cpp:59:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () { 
       ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 380 KB Output is correct
3 Correct 2 ms 408 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 364 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 164 ms 6856 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 3 ms 764 KB Output is correct
13 Correct 3 ms 760 KB Output is correct
14 Correct 3 ms 760 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 2 ms 504 KB Output is correct
18 Correct 2 ms 504 KB Output is correct
19 Correct 2 ms 504 KB Output is correct
20 Correct 2 ms 508 KB Output is correct
21 Correct 2 ms 632 KB Output is correct
22 Correct 3 ms 680 KB Output is correct
23 Correct 3 ms 760 KB Output is correct
24 Correct 3 ms 636 KB Output is correct
25 Correct 3 ms 760 KB Output is correct
26 Correct 3 ms 760 KB Output is correct
27 Correct 3 ms 760 KB Output is correct
28 Correct 3 ms 888 KB Output is correct
29 Correct 3 ms 760 KB Output is correct
30 Correct 3 ms 888 KB Output is correct
31 Correct 3 ms 888 KB Output is correct
32 Correct 3 ms 888 KB Output is correct
33 Correct 18 ms 2872 KB Output is correct
34 Correct 18 ms 2936 KB Output is correct
35 Correct 36 ms 2936 KB Output is correct
36 Correct 22 ms 3320 KB Output is correct
37 Correct 23 ms 3320 KB Output is correct
38 Correct 47 ms 3320 KB Output is correct
39 Correct 28 ms 3704 KB Output is correct
40 Correct 28 ms 3704 KB Output is correct
41 Correct 64 ms 3832 KB Output is correct
42 Correct 34 ms 4220 KB Output is correct
43 Correct 34 ms 4088 KB Output is correct
44 Correct 83 ms 4088 KB Output is correct
45 Correct 41 ms 4600 KB Output is correct
46 Correct 40 ms 4600 KB Output is correct
47 Correct 92 ms 4472 KB Output is correct
48 Correct 46 ms 4944 KB Output is correct
49 Correct 47 ms 4984 KB Output is correct
50 Correct 112 ms 4984 KB Output is correct
51 Correct 53 ms 5368 KB Output is correct
52 Correct 55 ms 5368 KB Output is correct
53 Correct 142 ms 5496 KB Output is correct
54 Correct 63 ms 5752 KB Output is correct
55 Correct 62 ms 5752 KB Output is correct
56 Correct 169 ms 5752 KB Output is correct
57 Correct 71 ms 6136 KB Output is correct
58 Correct 74 ms 6188 KB Output is correct
59 Correct 193 ms 6248 KB Output is correct
60 Correct 87 ms 6652 KB Output is correct
61 Correct 81 ms 6572 KB Output is correct
62 Correct 243 ms 6776 KB Output is correct
63 Correct 183 ms 6748 KB Output is correct
64 Correct 293 ms 6676 KB Output is correct
65 Correct 238 ms 6648 KB Output is correct
66 Correct 206 ms 6756 KB Output is correct
67 Correct 202 ms 6648 KB Output is correct
68 Correct 113 ms 6648 KB Output is correct
69 Correct 112 ms 6652 KB Output is correct
70 Correct 101 ms 6636 KB Output is correct
71 Correct 105 ms 6704 KB Output is correct
72 Correct 98 ms 6648 KB Output is correct
73 Correct 98 ms 6784 KB Output is correct
74 Correct 135 ms 6784 KB Output is correct
75 Correct 155 ms 7040 KB Output is correct
76 Correct 132 ms 6864 KB Output is correct
77 Correct 127 ms 6784 KB Output is correct
78 Correct 149 ms 6832 KB Output is correct
79 Correct 111 ms 6796 KB Output is correct
80 Correct 127 ms 6924 KB Output is correct
81 Correct 135 ms 6796 KB Output is correct
82 Correct 132 ms 6792 KB Output is correct
83 Correct 152 ms 6840 KB Output is correct
84 Correct 147 ms 6840 KB Output is correct
85 Correct 146 ms 6708 KB Output is correct
86 Correct 147 ms 6840 KB Output is correct
87 Correct 151 ms 6708 KB Output is correct
88 Correct 153 ms 6876 KB Output is correct
89 Correct 157 ms 6856 KB Output is correct
90 Correct 164 ms 6944 KB Output is correct
91 Correct 160 ms 6748 KB Output is correct
92 Correct 177 ms 6948 KB Output is correct