View Compilation Error

0_0_29162693_24169.cpp: In function 'void dij()':
0_0_29162693_24169.cpp:7:37: error: 'memset' was not declared in this scope
 #define ms(a,b) memset(a,b,sizeof(a))  
                                     ^
0_0_29162693_24169.cpp:21:5: note: in expansion of macro 'ms'
     ms(d, INF);  
     ^