View Compilation Error

0_0_30321361_2922.cpp: In function 'int main()':
0_0_30321361_2922.cpp:72:81: error: 'absf' was not declared in this scope
         for(int c = b+1; c <= n; c++){ if(absf(dis(p[a], p[c]) - dis(p[b], p[c])) <= 0.00000001) continue;
                                                                                 ^