Compilare: user.cpp: In function ‘void GeneratePrimeNrs(std::vector<int>*, int)’: user.cpp:32:6: warning: unused variable ‘idx’ [-Wunused-variable] int idx = 0; ^ user.cpp: In function ‘int main()’: user.cpp:56:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<l.size(); j++) ^ user.cpp:66:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<primeNumbers.size(); j++) ^ user.cpp:80:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<l.size(); i++) ^ user.cpp:39:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN_FILE_NAME, "r", stdin); ^ user.cpp:40:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT_FILE_NAME, "w", stdout); ^ user.cpp:43:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:49:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:55:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llu", &nr); ^