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https://blog.csdn.net/u012325397/article/details/26818317
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 .#......... .#.#######. .#.#.....#. .#.#.###.#. .#.#..@#.#. .#.#####.#. .#.......#. .#########. ........... 11 6 ..#..#..#.. ..#..#..#.. ..#..#..### ..#..#..#@. ..#..#..#.. ..#..#..#.. 7 7 ..#.#.. ..#.#.. ###.### ...@... ###.### ..#.#.. ..#.#.. 0 0
Sample Output
45 59 6 13
DFS水题,带来了久违一次AC。太感动了~
#include#include char map[25][25];int vis[25][25],cnt,w,h;void dfs(int x,int y){ if(x<0||y<0||x>=w||y>=h) return ; if(map[y][x]=='#') return ; if(vis[y][x]) return; if(!vis[y][x]&&(map[y][x]=='.'||map[y][x]=='@')) { vis[y][x]=1; cnt++; } dfs(x+1,y); dfs(x-1,y); dfs(x,y+1); dfs(x,y-1);}int main(){ int x,y; while (scanf("%d%d",&w,&h),w&&h) { getchar(); for(int i=0;i