View Compilation Error

0_0_21427940_22294.cpp: In function 'void init()':
0_0_21427940_22294.cpp:66:39: error: 'memset' was not declared in this scope
     memset(fac_cnt, 0, sizeof(fac_cnt));
                                       ^
0_0_21427940_22294.cpp: In function 'int main()':
0_0_21427940_22294.cpp:85:33: error: 'memset' was not declared in this scope
         memset(sz, 0, sizeof(sz));
                                 ^