HDU 1312 Red and Black 【DPS】
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Red and Black
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 13487 Accepted Submission(s): 8359
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.
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)
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
4559613
Source
Asia 2004, Ehime (Japan), Japan Domestic
题意:
从@开始走 #是墙 计算@能走的位置 ‘.’表示可以走1地方
注意:
1:本题没有用到回溯 因为可以返回到走过的位置 但是不再增加步数
2:31行getchar()很重要
3:map 是地图 step是走下一步的方向
#include<stdio.h>#include<string.h>int a,b,ax,ay,nx,ny,s,step[4][2]= {{1,0},{-1,0},{0,1},{0,-1}};char map[25][25];void DFS(int x,int y){ //if(x<=0||x>b||y<=0||y>a) return ;//并没什么用 //if(map[x][y]=='#') return ;//之前这里的问题找了好久 一直没发现为什么 在被标记#后再DPS 判断#后直接return,无法进行下一步搜索 for(int i=0; i<=3; i++) { // printf("%d %d x\n",x,y); nx=x+step[i][0]; ny=y+step[i][1]; //if(nx<=0||nx>b||ny<=0||ny>a||map[nx][ny]=='#'||map[nx][ny]=='O') continue; 不符合的条件 if(map[nx][ny]=='.')//符合要求 { s++; map[nx][ny]='#'; DFS(nx,ny); } }}int main (void){ int i,ii; while(~scanf("%d%d",&a,&b),a||b) { s=0; memset(map,'0',sizeof(map)); getchar(); for(i=1; i<=b; i++) { for(ii=1; ii<=a; ii++) { scanf("%c",&map[i][ii]); if(map[i][ii]=='@') { ax=i; ay=ii; } } getchar(); } s=0; DFS(ax,ay); printf("%d\n",s+1);//没有计算起点 所以+1 } return 0;}
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