Compilare: user.cpp: In function ‘int main()’: user.cpp:103:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<num.size() && first_one < 0; i++) ^ user.cpp:114:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; first_one < num.size(); first_one++) if (num[first_one] == '1') { ^ user.cpp:116:85: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int bit_size=1; !found_solution && bit_size < num.size() - first_one + 1; bit_size++) { ^ user.cpp:133:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<curr_num_binary.size() && curr_i<num.size() && is_right_correct; i++, curr_i++) { ^ user.cpp:133:75: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<curr_num_binary.size() && curr_i<num.size() && is_right_correct; i++, curr_i++) { ^ user.cpp:139:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (curr_i == num.size()) { ^ user.cpp:94:54: 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:95:56: 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); ^