Compilare: user.cpp: In function ‘int main()’: user.cpp:146:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (Ones(left) == left.size()) { ^ user.cpp:148:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (rz < left.size()) { ^ user.cpp:167:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < left.size(); ++j) { ^ user.cpp:179:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < left.size(); ++j) { ^ user.cpp:187:17: warning: unused variable ‘pula’ [-Wunused-variable] int pula = 1; ^ user.cpp:206:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((_num & 1) != B[pos] - '0') { ^ user.cpp:92:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitepatternmatching.in", "r", stdin); ^ user.cpp:93:56: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitepatternmatching.out", "w", stdout); ^ user.cpp:94:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("debug.err", "w", stderr); ^