View Compilation Error

0_0_32727702_591.cpp: In function 'int main()':
0_0_32727702_591.cpp:17:32: error: 'memset' was not declared in this scope
         memset(ar, 0, sizeof ar);
                                ^
0_0_32727702_591.cpp:19:28: error: 'strlen' was not declared in this scope
         while (i < strlen(p) - 1) //next函数
                            ^
0_0_32727702_591.cpp:32:28: error: 'strlen' was not declared in this scope
         while (m < strlen(s))
                            ^