Compilare: user.cpp: In function ‘bool find(unsigned int)’: user.cpp:23:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[code % MOD].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:37:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) ^ user.cpp:54:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = n; i < sir.size(); ++i) { ^ user.cpp:54:23: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = n; i < sir.size(); ++i) { ^