杭電Red and Black。。。。水題
Red and Black
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 14279 Accepted Submission(s): 8852
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.
'.' - 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 .#......... .#.#######. .#.#.....#. .#.#.###.#. .#.#
#include <iostream> using namespace std; char a[22][22]; int m,n; int p,q; int cnt; void dfs (int x, int y) { if (a[x][y]=='#' || x < 1 || x >n|| y < 1 || y > m) return ; ++cnt ; a[x][y] ='#'; dfs (x-1, y) ; dfs (x, y-1) ; dfs (x+1, y) ; dfs (x, y+1) ; } int main () { while(cin>>m>>n) { int i,j; if(m==0&&n==0) break; for( i=1;i<=n;i++) for( j=1;j<=m;j++) { cin>>a[i][j]; if(a[i][j]=='@') { p=i; q=j; a[i][j] = '.' ; } } cnt=0; dfs(p,q); cout<<cnt<<endl; } return 0; }
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