Compilare: main.cpp:32:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:40:15: warning: unused variable 'msk' [-Wunused-variable] int pos=0,msk=1<<20; ^~~ main.cpp:42:10: warning: variable 'who' set but not used [-Wunused-but-set-variable] bool who; ^~~ main.cpp: In function 'long long unsigned int cb(long long unsigned int, long long unsigned int)': main.cpp:18:23: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] return part[l][pos]; ^ main.cpp: In function 'bool check(long long unsigned int)': main.cpp:18:23: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] return part[l][pos]; ^ main.cpp:10:22: note: 'pos' was declared here int st=1,dr=1e10,pos; ^~~