Compilare: user.cpp: In member function ‘std::vector<int> cell::get(std::vector<int>, std::vector<int>)’: user.cpp:74:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ((i < lo.size()) && (j < hi.size())) { ^ user.cpp:74:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ((i < lo.size()) && (j < hi.size())) { ^ user.cpp:83:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < lo.size()) { ^ user.cpp:87:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < hi.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:213:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.out", "w", stdout); ^ user.cpp:215:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &N, &M); ^ user.cpp:217:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &set[i]); ^ user.cpp:223:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &task, &a); ^ user.cpp:228:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &b, &k); ^