Compilare: user.cpp: In function ‘int main()’: user.cpp:114:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptra < vala.size() && vala[ptra].first <= qr[i].ans - (1 << pw)) ^ user.cpp:116:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptrb < valb.size() && valb[ptrb].first <= qr[i].ans - (1 << pw)) ^ user.cpp:129:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptra < p1.size() && ptrb < p2.size()) ^ user.cpp:129:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptra < p1.size() && ptrb < p2.size()) ^ user.cpp:136:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptra < p1.size()) ^ user.cpp:138:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptrb < p2.size()) ^ user.cpp: In function ‘int get()’: user.cpp:52:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, maxb, stdin), ptr = 0; ^ user.cpp:57:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, maxb, stdin), ptr = 0; ^ user.cpp: In function ‘int main()’: user.cpp:64:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mediana.in", "r", stdin); ^ user.cpp:65:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mediana.out", "w", stdout); ^ user.cpp:68:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, maxb, stdin); ^