View Compilation Error

0_0_36571366_24455.cpp: In function 'void solve()':
0_0_36571366_24455.cpp:48:60: error: 'max' was not declared in this scope
                     ans=max(ans,cal(prime[j],a[x]%prime[j]));
                                                            ^
0_0_36571366_24455.cpp:48:60: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_36571366_24455.cpp:6:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3454:5: note:   'std::max'
     max(initializer_list<_Tp> __l, _Compare __comp)
     ^