View Compilation Error

0_0_19196178_13533.cpp: In function 'void init()':
0_0_19196178_13533.cpp:10:27: error: 'memset' was not declared in this scope
     memset(c, 0, sizeof(c));
                           ^
0_0_19196178_13533.cpp: In function 'void mul(long long int (*)[52], long long int (*)[52])':
0_0_19196178_13533.cpp:40:27: error: 'memset' was not declared in this scope
     memset(t, 0, sizeof(t));
                           ^