View Compilation Error

0_0_16327597_15962.cpp: In function 'int main()':
0_0_16327597_15962.cpp:51:26: error: 'max' was not declared in this scope
                 x=max(x,y);
                          ^
0_0_16327597_15962.cpp:57:37: error: 'max' was not declared in this scope
                 maxn=max(maxn,gen[i]);
                                     ^