Compilare: user.cpp: In function ‘int getPowers(int, int)’: user.cpp:63:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < factors.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:100:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<factors.size(); ++i) ^ user.cpp:112:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<factors.size(); ++j) ^ user.cpp:77:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("preasimplu.in", "r", stdin); ^ user.cpp:78:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("preasimplu.out", "w", stdout); ^ user.cpp:85:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:87:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &k, &mod); ^