View Compilation Error

0_0_17297561_3985.cpp: In function 'int hungary()':
0_0_17297561_3985.cpp:5:47: error: 'memset' was not declared in this scope
 #define _clr(x) memset(x,0xff,sizeof(int)*1100)
                                               ^
0_0_17297561_3985.cpp:23:10: note: in expansion of macro '_clr'
     for (_clr(match1),_clr(match2),i=0;i<n;ret+=(match1[i++]>=0))
          ^
0_0_17297561_3985.cpp: In function 'int main()':
0_0_17297561_3985.cpp:42:37: error: 'memset' was not declared in this scope
          memset (mat, 0, sizeof(mat));
                                     ^