View Compilation Error

0_0_28694797_26214.cpp: In member function 'void String::read(int)':
0_0_28694797_26214.cpp:18:47: error: 'strlen' was not declared in this scope
         sum[i]=sum[i-1]+(int)strlen(s+sum[i-1]);
                                               ^
0_0_28694797_26214.cpp: In member function 'void String::read(int, char*, int)':
0_0_28694797_26214.cpp:21:29: error: 'strcpy' was not declared in this scope
         strcpy(s+sum[i-1],ss);
                             ^
0_0_28694797_26214.cpp: In member function 'void ACAuto::clear()':
0_0_28694797_26214.cpp:43:32: error: 'memset' was not declared in this scope
         memset(val,0,sizeof val);
                                ^
0_0_28694797_26214.cpp: In function 'int main()':
0_0_28694797_26214.cpp:101:31: error: expected '}' at end of input
         for(int i=1;i<=n;++i) {
                               ^
0_0_28694797_26214.cpp:101:31: error: expected '}' at end of input
0_0_28694797_26214.cpp:101:31: error: expected '}' at end of input