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#include<iostream> #include<cstring> using namespace std; struct node{ int x1; int y1; int num; }arry[5]; const int MAXN = 25; char Map[MAXN][MAXN]; int ac; int havekey[5]; int findkey[5]; void check(); void dfs(int x,int y){ if(Map[x][y] != ‘X‘){ switch(Map[x][y]){ case ‘a‘: case ‘b‘: case ‘c‘: case ‘d‘: case ‘e‘: findkey[Map[x][y] - ‘a‘]++; break; case ‘A‘: case ‘B‘: case ‘C‘: case ‘D‘: case ‘E‘: arry[Map[x][y] - ‘A‘].x1 = x; arry[Map[x][y] - ‘A‘].y1 = y; arry[Map[x][y] - ‘A‘].num++; return; case ‘G‘: ac = true; return; } Map[x][y] = ‘X‘; //标记已经走过 dfs(x - 1,y); dfs(x + 1,y); dfs(x,y - 1); dfs(x,y + 1); check(); } } void check(){ for(int i = 0;i < 5;i++){ if(arry[i].num){ if(findkey[i] == havekey[i]){ Map[arry[i].x1][arry[i].y1] = ‘X‘; dfs(arry[i].x1 + 1,arry[i].y1); dfs(arry[i].x1 - 1,arry[i].y1); dfs(arry[i].x1,arry[i].y1 + 1); dfs(arry[i].x1,arry[i].y1 - 1); } } } } int main(){ int m,n; while((cin >> m >> n) && (m || n)){ memset(havekey,0,sizeof(havekey)); memset(findkey,0,sizeof(findkey)); memset(arry,0,sizeof(arry)); memset(Map,‘X‘,sizeof(Map));//初始边界,否则递归搜索时,会越界空指针 ac = 0; int a1,b1; for(int i = 1;i <= m;i++){ for(int j = 1;j <= n;j++){ cin >> Map[i][j]; if(Map[i][j] == ‘S‘) a1 = i,b1 = j; else if(Map[i][j] >= ‘a‘ && Map[i][j] <= ‘e‘)//将其保存至数组 havekey[Map[i][j] - ‘a‘]++; } } dfs(a1,b1); if(ac){ cout << "YES" << endl; }else cout << "NO" << endl; } return 0; } //4 4 //S.X. //a.X. //..XG //.... //3 4 //S.Xa //.aXB //b.AG //0 0
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原文地址:http://www.cnblogs.com/zhengbin/p/4513383.html