Compilare: user.cpp: In function ‘int main()’: user.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < nr.size(); i++) ~~^~~~~~~~~~~ user.cpp:57:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = (mij + 1) * 2 - 1; i < nr.size(); i = i + mij + 1) ~~^~~~~~~~~~~ user.cpp:74:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nr.size() % (mij + 1) != 0 && (mij + 1) * 2 < nr.size()) ~~~~~~~~~~~~~~^~~~~~~~~~~ user.cpp:76:59: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] int a = ((Hash_1[nr.size() - 1] - (Hash_1[last] * cnst_1[nr.size() - 1 - last]) % MOD_1 + MOD_1) % MOD_1); ^