0_0_39453168_7619.cpp: In function 'void build(int, int, int)':
0_0_39453168_7619.cpp:30:45: error: return-statement with a value, in function returning 'void' [-fpermissive]
30 | if(l==r) return vec[p].emplace_back(0,0),vec[p].emplace_back(a[l],b[l]);
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|