0_0_20350110_30581.cpp: In function 'void build(int, int, int)':
0_0_20350110_30581.cpp:26:12: error: expected ')' at end of input
mid=(l+r
^
0_0_20350110_30581.cpp:26:12: error: expected ';' at end of input
0_0_20350110_30581.cpp:26:12: error: expected '}' at end of input
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