View Compilation Error

0_0_38359552_14268.cpp: In instantiation of 'TreeArray<maxLen>::TreeArray(int) [with int maxLen = 50000]':
0_0_38359552_14268.cpp:45:24:   required from here
0_0_38359552_14268.cpp:11:37: error: 'memset' was not declared in this scope
   memset(c, 0, sizeof(int)*(len + 1));
                                     ^