View Compilation Error

0_0_35328168_13959.cpp: In function 'bool spfa(int, int, int)':
0_0_35328168_13959.cpp:39:32: error: 'memset' was not declared in this scope
    memset(mer ,255 ,sizeof(mer));
                                ^
0_0_35328168_13959.cpp: In function 'int main()':
0_0_35328168_13959.cpp:91:35: error: 'memset' was not declared in this scope
       memset(list ,0 ,sizeof(list));
                                   ^