Building bridges_hdu_4584(排序).java
Building bridges
Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 65535/32768 K (Java/Others)
Total Submission(s): 301 Accepted Submission(s): 189
Their world can be considered as a matrix made up of three letters 'H','C' and 'O'.Every 'H' stands for an island of Hululu, every 'C' stands for an island of Cululu, and 'O' stands for the ocean. Here is a example:
The coordinate of the up-left corner is (0,0), and the down-right corner is (4, 3). The x-direction is horizontal, and the y-direction is vertical.
There may be too many options of selecting two islands. To simplify the problem , they come up with some rules below:
1. The distance between the two islands must be as short as possible. If the two islands' coordinates are (x1,y1) and (x2,y2), the distance is |x1-x2|+|y1-y2|.
2. If there are more than one pair of islands satisfied the rule 1, choose the pair in which the Hululu island has the smallest x coordinate. If there are still more than one options, choose the Hululu island which has the smallest y coordinate.
3.After the Hululu island is decided, if there are multiple options for the Cululu island, also make the choice by rule 2.
Please help their people to build the bridge.
In each test case, the first line contains two integers M and N, meaning that the matrix is M×N ( 2<=M,N <= 40).
Next M lines stand for the matrix. Each line has N letters.
The input ends with M = 0 and N = 0.
It's guaranteed that there is a solution.
x1 y1 x2 y2
x1,y1 is the coordinate of Hululu island, x2 ,y2 is the coordinate of Cululu island.
CHCH
HCHC
CCCO
COHO
5 4
OHCH
HCHC
CCCO
COHO
HCHC
0 0
0 1 0 2
import java.io.BufferedReader;
import java.io.InputStreamReader; public class Main{
public static void main(String[] args) {
BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));
try {
while(true){
String s[]=bf.readLine().split(" ");
int n=Integer.parseInt(s[0]);
int m=Integer.parseInt(s[1]);
if(m==0&&n==0)
break;
char a[][]=new char[n][m];
int x1=0,y1=0,x2=0,y2=0;
Point fh[]=new Point[n*m+1];
Point fc[]=new Point[n*m+1];
int x=0,y=0;
for(int i=0;i<n;i++){
String str=bf.readLine();
for(int j=0;j<m;j++){
a[i][j]=str.charAt(j);
if(a[i][j]=='H'){
fh[x++]=new Point(i,j);
}
else if(a[i][j]=='C'){
fc[y++]=new Point(i,j);
}
}
}
int max=Integer.MAX_VALUE;
for(int i=0;i<x;i++){
for(int j=0;j<y;j++){
int dd=DD(fh[i],fc[j]);
if(dd<max){
x1=fh[i].x;
y1=fh[i].y;
x2=fc[j].x;
y2=fc[j].y;
max=dd;
}
}
}
System.out.println(x1+" "+y1+" "+x2+" "+y2);
}
} catch (Exception e) {
e.printStackTrace();
}
} private static int DD(Point a, Point b) {
return Math.abs(a.x-b.x)+Math.abs(a.y-b.y);
}
}
class Point{
int x,y; public Point(int x, int y) {
this.x = x;
this.y = y;
}
}
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