Compilare: user.cpp: In function ‘unsigned int apply(unsigned int, std::vector<std::pair<int, int> >&)’: user.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) { ^ user.cpp:17:15: warning: suggest parentheses around arithmetic in operand of ‘|’ [-Wparentheses] nr = nr & ~(1 << v[i].first) | (1 << v[i].second); ^ user.cpp: In function ‘int main()’: user.cpp:41:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (unsigned int i = 0; i < (1 << n) && sorts_all; ++i) { ^ user.cpp:29:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &teste); ^ user.cpp:32:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:35:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &v[i].first, &v[i].second); ^