Compilare: main.cpp: In function 'void prec()': main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<eul.size()-(1<<i)+1; ++j) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int solve(int, int)': main.cpp:73:57: warning: unused variable 'u' [-Wunused-variable] int mn1=1e9, mn2=1e9, lg=lvl[x]-lvl[el],p2=log2(lg),u=0; ^