View Compilation Error

0_0_22201647_5730.cpp: In function 'bool ok(int)':
0_0_22201647_5730.cpp:18:42: error: 'x' was not declared in this scope
             ma1=max(ma1,left[i]+right[i]-x);//(x+y)<=(l+r-time) 此时time为solve函数中传入的mid   
                                          ^