Compilare: user.cpp: In function ‘int main()’: user.cpp:148:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) ^ user.cpp:119:42: warning: ‘inv10mod2’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr2 = (1LL*(nr2 - cif.back() + mod2)*inv10mod2) % mod2; ^ user.cpp:118:42: warning: ‘inv10mod1’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr1 = (1LL*(nr1 - cif.back() + mod1)*inv10mod1) % mod1; ^ user.cpp:73:42: warning: ‘inv2mod2’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr2 = (1LL*(nr2 - cif.back() + mod2)*inv2mod2) % mod2; ^ user.cpp:72:42: warning: ‘inv2mod1’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr1 = (1LL*(nr1 - cif.back() + mod1)*inv2mod1) % mod1; ^