View Compilation Error

0_0_19979280_22983.cpp:4:1: error: 'll' does not name a type
 ll read()
 ^
0_0_19979280_22983.cpp: In function 'int main()':
0_0_19979280_22983.cpp:17:34: error: 'read' was not declared in this scope
     for(int i=1;i<=n;i++) x=read();
                                  ^
0_0_19979280_22983.cpp:18:12: error: 'read' was not declared in this scope
     m=read();
            ^
0_0_19979280_22983.cpp:24:1: error: expected '}' at end of input
 }
 ^