View Compilation Error

0_0_33828025_23333.cpp: In function 'void solve()':
0_0_33828025_23333.cpp:42:88: error: 'Q' was not declared in this scope
             if(s[i]=='0'){if(s[i+1]>='0'&&s[i+1]<='9'&&(s[i-1]=='+'||s[i-1]=='*'||!i)){Q flag=0;break; }  }
                                                                                        ^