View Compilation Error

0_0_24914177_19321.cpp: In function 'void init()':
0_0_24914177_19321.cpp:16:31: error: 'memset' was not declared in this scope
     memset(vis, 0, sizeof(vis));
                               ^
0_0_24914177_19321.cpp: In function 'LL cac(int, int)':
0_0_24914177_19321.cpp:52:25: error: 'memset' was not declared in this scope
     memset(a,0,sizeof(a));
                         ^