View Compilation Error

0_0_22443033_10373.cpp: In function 'int main()':
0_0_22443033_10373.cpp:18:41: error: 'max' was not declared in this scope
                 for(int k=i*j;k>=max(i,j);k--)//步数不可能比i*j更多也要大于i,j中最大值因为已经覆盖了这么?
                                         ^
0_0_22443033_10373.cpp:18:41: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_22443033_10373.cpp:1:
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)
     ^