Compilare: main.cpp: In function 'bool ver2(long long unsigned int)': main.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(F[i][j]<c[i][j]) ok=false; ~~~~~~~^~~~~~~~ main.cpp: In function 'int cer1()': main.cpp:49:12: warning: 'niv' may be used uninitialized in this function [-Wmaybe-uninitialized] return niv; ^~~ main.cpp: In function 'int main()': main.cpp:80:20: warning: 'niv' may be used uninitialized in this function [-Wmaybe-uninitialized] out<<cer1(); ^