/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:10:12: warning: left operand of comma operator has no effect [-Wunused-value]
    if(i,j!=0){
            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:18: warning: format '%c' expects argument of type 'char*', but argument 2 has type 'int' [-Wformat=]
    scanf("%c",map);
                  ^