View Compilation Error

0_0_24100355_6211.cpp: In function 'int main()':
0_0_24100355_6211.cpp:9:25: error: 'memset' was not declared in this scope
   memset(fb,0,sizeof(fb));
                         ^
0_0_24100355_6211.cpp:16:16: error: 'sort' was not declared in this scope
    sort(a,a+cnt); bool f=true;
                ^