0_0_25719469_8314.cpp: In function 'int main()':
0_0_25719469_8314.cpp:53:26: error: invalid initialization of non-const reference of type 'int&' from an rvalue of type 'int'
build(1,all,rt[0]);
^
0_0_25719469_8314.cpp:7:6: note: in passing argument 1 of 'void build(int&, int, int)'
void build(int& o, int l, int r){
^
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