View Compilation Error

0_0_17201327_4144.cpp: In function 'void solve()':
0_0_17201327_4144.cpp:45:46: error: 'printf' was not declared in this scope
     printf("%.3lf %.3lf\n",L+eps,makeR(L)+eps);
                                              ^
0_0_17201327_4144.cpp: In function 'int main()':
0_0_17201327_4144.cpp:51:19: error: 'scanf' was not declared in this scope
     scanf("%d",&ca);
                   ^
0_0_17201327_4144.cpp:60:36: error: 'sqrt' was not declared in this scope
             p[i].x=sqrt(tx*tx+ty*ty);
                                    ^
0_0_17201327_4144.cpp:61:27: error: 'max' was not declared in this scope
             Y=max(p[i].y,Y);
                           ^