View Compilation Error

0_0_21880135_5979.cpp: In function 'bool is(std::string)':
0_0_21880135_5979.cpp:9:2: error: 'nbsp' was not declared in this scope
         int i,k=0,flag=0,t=0;
  ^
0_0_21880135_5979.cpp:22:15: error: 'else' without a previous 'if'
     else return true;
               ^
0_0_21880135_5979.cpp: In function 'int BFS(std::string)':
0_0_21880135_5979.cpp:27:2: error: 'nbsp' was not declared in this scope
         queue<string> Qu;
  ^
0_0_21880135_5979.cpp: In function 'int main()':
0_0_21880135_5979.cpp:92:2: error: 'nbsp' was not declared in this scope
         string state;
  ^
0_0_21880135_5979.cpp:96:75: error: break statement not within loop or switch
                 if(state[0]=='-') break;
                                                                           ^
0_0_21880135_5979.cpp:98:57: error: 'else' without a previous 'if'
                 else {
                                                         ^