View Compilation Error

0_0_21045312_25314.cpp: In function 'int main()':
0_0_21045312_25314.cpp:34:31: error: 'memset' was not declared in this scope
         memset(a,'.',sizeof(a));
                               ^
0_0_21045312_25314.cpp:50:52: error: invalid operands of types 'void' and 'void' to binary 'operator+'
                     times+=dfs(i,j,'R')+dfs(i,j,'B');
                                                    ^