View Compilation Error

0_0_18029543_13138.cpp: In function 'void init()':
0_0_18029543_13138.cpp:35:32: error: 'memset' was not declared in this scope
     memset(head,-1,sizeof(head));
                                ^
0_0_18029543_13138.cpp: In function 'int main()':
0_0_18029543_13138.cpp:72:25: error: 'memset' was not declared in this scope
   memset(dp,0,sizeof(dp));
                         ^