View Compilation Error

0_0_34562570_23671.cpp: In function 'void init()':
0_0_34562570_23671.cpp:36:28: error: 'memset' was not declared in this scope
   memset(dp, -1, sizeof(dp));
                            ^
0_0_34562570_23671.cpp: In function 'int main()':
0_0_34562570_23671.cpp:168:39: error: 'memset' was not declared in this scope
     memset(instack, 0, sizeof(instack));
                                       ^