View Compilation Error

0_0_15262839_15657.cpp: In function 'int main()':
0_0_15262839_15657.cpp:11:25: error: 'strlen' was not declared in this scope
         l = strlen(a + 1);
                         ^
0_0_15262839_15657.cpp:41:31: error: 'memset' was not declared in this scope
         memset(g, 0, sizeof(g));
                               ^