Compilare: main.cpp: In function 'int main()': main.cpp:74:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < buckets[i].size() && qry[buckets[i][pos]].y == j){ ~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:66:13: warning: unused variable 'st' [-Wunused-variable] int st = (i-1) * lg, dr = min(n,i*lg); ^~