HDU 1312Red and Black(dfs)
2017-09-12 20:22
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Red and Black
Time Limit : 2000/1000ms (Java/Other) Memory Limit : 65536/32768K (Java/Other)
Total Submission(s) : 1 Accepted Submission(s) : 1
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Problem Description
There is a rectangular room, covered with square tiles. Each tile is colored either red or black. A man is standing on a black tile. From a tile, he can move to one of four adjacent tiles. But he can't move on red tiles, he can move only on black tiles.Write a program to count the number of black tiles which he can reach by repeating the moves described above.
Input
The input consists of multiple data sets. A data set starts with a line containing two positive integers W and H; W and H are the numbers of tiles in the x- and y- directions, respectively. W and H are not more than 20.There are H more lines in the data set, each of which includes W characters. Each character represents the color of a tile as follows.
4000
'.' - a black tile
'#' - a red tile
'@' - a man on a black tile(appears exactly once in a data set)
Output
For each data set, your program should output a line which contains the number of tiles he can reach from the initial tile (including itself).
Sample Input
6 9 ....#. .....# ...... ...... ...... ...... ...... #@...# .#..#. 11 9 .#......... .#.#######. .#.#.....#. .#.#.###.#. .#.#..@#.#. .#.#####.#. .#.......#. .#########. ........... 11 6 ..#..#..#.. ..#..#..#.. ..#..#..### ..#..#..#@. ..#..#..#.. ..#..#..#.. 7 7 ..#.#.. ..#.#.. ###.### ...@... ###.### ..#.#.. ..#.#.. 0 0
Sample Output
45 59 6 13
Source
Asia 2004, Ehime (Japan), Japan Domestic想法:简单dfs
代码:
#include<stdio.h> #include<string.h> char a[25][25]; int sx,sy,ex,ey,n,m,sum; int vir[4][2]={0,1,1,0,-1,0,0,-1}; void dfs(int x,int y) { sum++; a[x][y]='#'; for(int i=0;i<4;i++) { int tx=x+vir[i][0]; int ty=y+vir[i][1]; if(tx>=1&&tx<=n&&ty>=1&&ty<=m&&a[tx][ty]=='.') { dfs(tx,ty); } } return ; } int main() { while(scanf("%d %d",&m,&n)&&n+m) { getchar(); for(int i=1;i<=n;i++) { scanf("%s",a[i]+1); for(int j=1;j<=m;j++) { if(a[i][j]=='@') { sx=i,sy=j; } } } sum=0; dfs(sx,sy); printf("%d\n",sum); } return 0; }
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