View Compilation Error

0_0_26086862_5714.cpp: In function 'void spfa_s(int, int*)':
0_0_26086862_5714.cpp:18:29: error: 'memset' was not declared in this scope
     memset(vis,0,sizeof(vis));
                             ^
0_0_26086862_5714.cpp: In function 'void spfa_e(int, int*)':
0_0_26086862_5714.cpp:45:29: error: 'memset' was not declared in this scope
     memset(vis,0,sizeof(vis));
                             ^
0_0_26086862_5714.cpp: In function 'int main()':
0_0_26086862_5714.cpp:110:33: error: 'memset' was not declared in this scope
         memset(vis,0,sizeof(vis));
                                 ^