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View Compilation Error

0_0_21651434_16145.cpp: In function 'bool ok(int)':
0_0_21651434_16145.cpp:18:33: 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 
                                 ^


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