View Compilation Error

0_0_34131825_31800.cpp: In function 'int main()':
0_0_34131825_31800.cpp:69:26: error: 'read' was not declared in this scope
         long long n=read(),m=read();
                          ^
0_0_34131825_31800.cpp:70:32: error: 'm' was not declared in this scope
         printf("%lld\n",S(w[n],m));
                                ^