View Compilation Error

0_0_23425196_19243.cpp: In function 'bool spfa()':
0_0_23425196_19243.cpp:22:28: error: 'memset' was not declared in this scope
     memset(pi,-1,sizeof(pi));
                            ^
0_0_23425196_19243.cpp: In function 'int main(int, const char**)':
0_0_23425196_19243.cpp:83:33: error: 'memset' was not declared in this scope
         memset(cap,0,sizeof(cap));
                                 ^