View Compilation Error

0_0_33480244_19742.cpp: In function 'int E_K(int, int)':
0_0_33480244_19742.cpp:15:33: error: 'memset' was not declared in this scope
     memset(flow, 0, sizeof(flow));
                                 ^
0_0_33480244_19742.cpp: In function 'int main()':
0_0_33480244_19742.cpp:49:35: error: 'memset' was not declared in this scope
         memset(cap, 0, sizeof(cap));
                                   ^