Compilare: user.cpp: In function ‘int main()’: user.cpp:99:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < p.size() ; ++ i) { ^ user.cpp:101:74: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((abs(p[i] - p[i + 1]) < 0.00001) && i + 1 < p.size()) { ^ user.cpp:73:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(infile, "r", stdin); ^ user.cpp:74:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outfile, "w", stdout); ^ user.cpp:76:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(infile, "r", stdin); ^ user.cpp: In function ‘void getInt(int&)’: user.cpp:47:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, lim, stdin); ^ user.cpp:54:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, lim, stdin); ^