Compilare: main.cpp: In function 'int legendre(int, int, int)': main.cpp:16:9: warning: unused variable 'copy' [-Wunused-variable] int copy = prime; ^~~~ main.cpp: In function 'int solve()': main.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < fact.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:96:12: warning: 'taker' may be used uninitialized in this function [-Wmaybe-uninitialized] return taker; ^~~~~