View Compilation Error

0_0_22785478_32754.cpp: In function 'void intt()':
0_0_22785478_32754.cpp:14:25: error: 'memset' was not declared in this scope
     memset(v,0,sizeof(v));
                         ^
0_0_22785478_32754.cpp: In function 'long long int pj(int)':
0_0_22785478_32754.cpp:37:25: error: 'memset' was not declared in this scope
     memset(v,0,sizeof(v));
                         ^