Compilare: user.cpp: In function ‘int main()’: user.cpp:57:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < prim.size(); ++j) ^ user.cpp:65:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < prim.size(); ++j) ^ user.cpp:40:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("popularitate.in","r",stdin); ^ user.cpp:41:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("popularitate.out","w",stdout); ^ user.cpp:43:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &k, &m); ^ user.cpp:49:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:55:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^