View Compilation Error

0_0_21090157_2916.cpp: In function 'int find(int, int)':
0_0_21090157_2916.cpp:17:23: error: 'abs' was not declared in this scope
         if(abs(t*t-2*p)<=1)ans++;  
                       ^
0_0_21090157_2916.cpp: In function 'int main()':
0_0_21090157_2916.cpp:24:18: error: 'scanf' was not declared in this scope
     scanf("%d",&T);  
                  ^
0_0_21090157_2916.cpp:29:33: error: 'memset' was not declared in this scope
         memset(sum,0,sizeof(sum));  
                                 ^
0_0_21090157_2916.cpp:41:26: error: 'printf' was not declared in this scope
         printf("%d\n",ans);  
                          ^