0_0_18477260_1092.cpp: In function 'Tree mergeNode(Tree&, Tree&)':
0_0_18477260_1092.cpp:40:22: error: return-statement with no value, in function returning 'Tree' [-fpermissive]
if(last < 0) return;
^
0_0_18477260_1092.cpp:51:22: error: return-statement with no value, in function returning 'Tree' [-fpermissive]
if(last < 0) return;
^
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