0_0_22451820_13494.cpp: In function 'void build(int, int, int, int)':
0_0_22451820_13494.cpp:75:5: error: 'flag' was not declared in this scope
flag[i<<1]=0; flag[i<<1|1]=0;
^
0_0_22451820_13494.cpp:75:10: error: 'i' was not declared in this scope
flag[i<<1]=0; flag[i<<1|1]=0;
^
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