/in/foo.cc: In function 'int main()':
/in/foo.cc:13:16: warning: format '%c' expects argument of type 'char*', but argument 2 has type 'int' [-Wformat=]
    scanf("%c",a);
                ^
/in/foo.cc:19:22: error: 'dfs' was not declared in this scope
    if(s[i][j])dfs(i,j),++ans;
                      ^
/in/foo.cc:22:22: error: a function-definition is not allowed here before '{' token
 void dfs(int x,int y){
                      ^
/in/foo.cc:29:1: error: expected '}' at end of input
 }
 ^