View Compilation Error

0_0_35151759_1873.cpp: In function 'int getone(int)':
0_0_35151759_1873.cpp:101:31: error: 'memset' was not declared in this scope
     memset(mark,0,sizeof(mark));
                               ^
0_0_35151759_1873.cpp: In function 'void process(int, int)':
0_0_35151759_1873.cpp:142:29: error: 'memset' was not declared in this scope
     memset(lun,0,sizeof(lun));
                             ^
0_0_35151759_1873.cpp: In function 'int main()':
0_0_35151759_1873.cpp:199:26: error: 'strlen' was not declared in this scope
         out[n][strlen(str)].print();
                          ^