oj.uz

Submission #138757

# Submission time Handle Problem Language Result Execution time Memory
138757 2019-07-30T09:53:30 Z Boxworld Mecho (IOI09_mecho) C++14
0 / 100
 1000 ms 9336 KB 
#include <bits/stdc++.h>
using namespace std;
const int N=1010;
typedef pair<int,int> pii;
char G[N][N];
int dx[4]={1,-1,0,0},dy[4]={0,0,1,-1};
int T[N][N],d[N][N],vis[N][N];
int n,s,sx,sy;
int bfs(int time){
	if (time*s>=T[sx][sy])return 0;
	memset(vis,0,sizeof(vis));
	queue<pii> Q;
	vis[sx][sy]=1;
	Q.push(make_pair(sx*N+sy,time*s));
	while(!Q.empty()){
		int dis=Q.front().second;
		int x=Q.front().first/N;
		int y=Q.front().first%N;
		Q.pop();
		if (G[x][y]=='D')return 1;
		
		for (int k=0;k<4;k++){
			int X=x+dx[k],Y=y+dy[k];
			if (X<1||X>N||Y<1||Y>N)continue;
			if (G[X][Y]=='T')continue;
			if (dis+1>=T[X][Y]||vis[X][Y])continue;
			vis[X][Y]=1;
			Q.push(make_pair(X*N+Y,dis+1));
		}
	}
	return 0;
}
int main(){
	scanf("%d%d",&n,&s);
	for (int i=1;i<=n;i++)scanf("%s",G[i]+1);
	memset(T,-1,sizeof(T));
	queue<int> bq;
	for (int i=1;i<=n;i++)
	for (int j=1;j<=n;j++){
		if (G[i][j]=='M')sx=i,sy=j;
		if (G[i][j]=='D')T[i][j]=n*n*s;
		if (G[i][j]=='H'){
			T[i][j]=0;
			bq.push(i*N+j);
		}
	}
	while(!bq.empty()){
		int x=bq.front()/N,y=bq.front()%N;
		bq.pop();
		for (int i=0;i<4;i++){
			int X=x+dx[i],Y=y+dy[i];
			if (x<1||x>n||y<1||y>n||T[X][Y]!=-1)continue;
			if (G[X][Y]=='T'||G[X][Y]=='D')continue;
			T[X][Y]=T[x][y]+s;
			bq.push(X*N+Y);
		}
	}
	int l=-1,r=n*n*2;
	while(l<r){
		int m=(l+r)/2;
		if (bfs(m))l=m;
		else r=m;
	}
	printf("%d\n",l);
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&s);
  ~~~~~^~~~~~~~~~~~~~
mecho.cpp:35:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i=1;i<=n;i++)scanf("%s",G[i]+1);
                        ~~~~~^~~~~~~~~~~~~

Subtask #1
0.0 / 100.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1063 ms 8312 KB Time limit exceeded
2 Execution timed out 1057 ms 8312 KB Time limit exceeded
3 Execution timed out 1069 ms 8312 KB Time limit exceeded
4 Execution timed out 1076 ms 8312 KB Time limit exceeded
5 Execution timed out 1069 ms 8312 KB Time limit exceeded
6 Execution timed out 1070 ms 8312 KB Time limit exceeded
7 Execution timed out 1069 ms 9208 KB Time limit exceeded
8 Execution timed out 1072 ms 8312 KB Time limit exceeded
9 Execution timed out 1074 ms 8312 KB Time limit exceeded
10 Execution timed out 1073 ms 8312 KB Time limit exceeded
11 Execution timed out 1080 ms 8312 KB Time limit exceeded
12 Execution timed out 1079 ms 8312 KB Time limit exceeded
13 Execution timed out 1078 ms 8312 KB Time limit exceeded
14 Execution timed out 1073 ms 8440 KB Time limit exceeded
15 Execution timed out 1079 ms 8312 KB Time limit exceeded
16 Execution timed out 1075 ms 8312 KB Time limit exceeded
17 Execution timed out 1062 ms 8312 KB Time limit exceeded
18 Execution timed out 1062 ms 8312 KB Time limit exceeded
19 Execution timed out 1056 ms 8312 KB Time limit exceeded
20 Execution timed out 1063 ms 8312 KB Time limit exceeded
21 Execution timed out 1067 ms 8312 KB Time limit exceeded
22 Execution timed out 1076 ms 8312 KB Time limit exceeded
23 Execution timed out 1068 ms 8312 KB Time limit exceeded
24 Execution timed out 1066 ms 8440 KB Time limit exceeded
25 Execution timed out 1072 ms 8440 KB Time limit exceeded
26 Execution timed out 1069 ms 8412 KB Time limit exceeded
27 Execution timed out 1072 ms 8312 KB Time limit exceeded
28 Execution timed out 1050 ms 8440 KB Time limit exceeded
29 Execution timed out 1073 ms 8312 KB Time limit exceeded
30 Execution timed out 1074 ms 8316 KB Time limit exceeded
31 Execution timed out 1062 ms 8440 KB Time limit exceeded
32 Execution timed out 1073 ms 8312 KB Time limit exceeded
33 Execution timed out 1061 ms 8696 KB Time limit exceeded
34 Execution timed out 1070 ms 8696 KB Time limit exceeded
35 Execution timed out 1069 ms 8696 KB Time limit exceeded
36 Execution timed out 1080 ms 8696 KB Time limit exceeded
37 Execution timed out 1072 ms 8696 KB Time limit exceeded
38 Execution timed out 1073 ms 8696 KB Time limit exceeded
39 Execution timed out 1079 ms 8824 KB Time limit exceeded
40 Execution timed out 1069 ms 8804 KB Time limit exceeded
41 Execution timed out 1069 ms 8696 KB Time limit exceeded
42 Execution timed out 1068 ms 8824 KB Time limit exceeded
43 Execution timed out 1056 ms 8824 KB Time limit exceeded
44 Execution timed out 1066 ms 8824 KB Time limit exceeded
45 Execution timed out 1060 ms 8824 KB Time limit exceeded
46 Execution timed out 1070 ms 8824 KB Time limit exceeded
47 Execution timed out 1075 ms 8824 KB Time limit exceeded
48 Execution timed out 1077 ms 8824 KB Time limit exceeded
49 Execution timed out 1069 ms 8824 KB Time limit exceeded
50 Execution timed out 1058 ms 9080 KB Time limit exceeded
51 Execution timed out 1080 ms 8952 KB Time limit exceeded
52 Execution timed out 1073 ms 8824 KB Time limit exceeded
53 Execution timed out 1065 ms 9080 KB Time limit exceeded
54 Execution timed out 1071 ms 8952 KB Time limit exceeded
55 Execution timed out 1076 ms 8952 KB Time limit exceeded
56 Execution timed out 1059 ms 9080 KB Time limit exceeded
57 Execution timed out 1049 ms 9044 KB Time limit exceeded
58 Execution timed out 1049 ms 9080 KB Time limit exceeded
59 Execution timed out 1062 ms 9080 KB Time limit exceeded
60 Execution timed out 1065 ms 9080 KB Time limit exceeded
61 Execution timed out 1054 ms 9080 KB Time limit exceeded
62 Execution timed out 1061 ms 9208 KB Time limit exceeded
63 Execution timed out 1068 ms 9080 KB Time limit exceeded
64 Execution timed out 1064 ms 9120 KB Time limit exceeded
65 Execution timed out 1072 ms 9080 KB Time limit exceeded
66 Execution timed out 1050 ms 9080 KB Time limit exceeded
67 Execution timed out 1053 ms 9080 KB Time limit exceeded
68 Execution timed out 1079 ms 9180 KB Time limit exceeded
69 Execution timed out 1076 ms 9080 KB Time limit exceeded
70 Execution timed out 1060 ms 9080 KB Time limit exceeded
71 Execution timed out 1062 ms 9136 KB Time limit exceeded
72 Execution timed out 1067 ms 9080 KB Time limit exceeded
73 Execution timed out 1050 ms 9208 KB Time limit exceeded
74 Execution timed out 1051 ms 9208 KB Time limit exceeded
75 Execution timed out 1061 ms 9256 KB Time limit exceeded
76 Execution timed out 1080 ms 9208 KB Time limit exceeded
77 Execution timed out 1063 ms 9208 KB Time limit exceeded
78 Execution timed out 1052 ms 9336 KB Time limit exceeded
79 Execution timed out 1067 ms 9208 KB Time limit exceeded
80 Execution timed out 1065 ms 9252 KB Time limit exceeded
81 Execution timed out 1074 ms 9208 KB Time limit exceeded
82 Execution timed out 1082 ms 9208 KB Time limit exceeded
83 Execution timed out 1062 ms 9208 KB Time limit exceeded
84 Execution timed out 1073 ms 9208 KB Time limit exceeded
85 Execution timed out 1068 ms 9208 KB Time limit exceeded
86 Execution timed out 1071 ms 9208 KB Time limit exceeded
87 Execution timed out 1066 ms 9224 KB Time limit exceeded
88 Execution timed out 1079 ms 9208 KB Time limit exceeded
89 Execution timed out 1073 ms 9208 KB Time limit exceeded
90 Execution timed out 1061 ms 9208 KB Time limit exceeded
91 Execution timed out 1083 ms 9208 KB Time limit exceeded
92 Execution timed out 1063 ms 9208 KB Time limit exceeded