View Compilation Error

0_0_26560690_8171.cpp: In function 'void spfa(int, int)':
0_0_26560690_8171.cpp:8:29: error: 'memset' was not declared in this scope
     memset(dis,0,sizeof(dis));
                             ^
0_0_26560690_8171.cpp: In function 'int main()':
0_0_26560690_8171.cpp:34:33: error: 'memset' was not declared in this scope
         memset(len,0,sizeof(len));
                                 ^