View Compilation Error

0_0_27686282_12967.cpp: In function 'int main()':
0_0_27686282_12967.cpp:15:2: error: 'nbsp' was not declared in this scope
     int n,m,K,s;
  ^
0_0_27686282_12967.cpp:19:51: error: 'a' was not declared in this scope
         memset(a,0,sizeof(Node)*MAXN);
                                                   ^
0_0_27686282_12967.cpp:19:62: error: 'Node' was not declared in this scope
         memset(a,0,sizeof(Node)*MAXN);
                                                              ^
0_0_27686282_12967.cpp:33:92: error: break statement not within loop or switch
                 break;
                                                                                            ^