Compilare: user.cpp: In function ‘void get_fish()’: user.cpp:46:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s.empty() || s.size() < k || -s.top() < v[i].p) ^ user.cpp:48:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!s.empty() && s.size() >= k) ^ user.cpp:59:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s.empty() || s.size() < k || -s.top() < v[i].p) ^ user.cpp:61:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!s.empty() && s.size() >= k) ^ user.cpp:41:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘void read()’: user.cpp:34:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("peste.in", "r", stdin); ^ user.cpp:35:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &k, &t); ^ user.cpp:37:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &v[i].p, &v[i].t); ^ user.cpp: In function ‘void write()’: user.cpp:87:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("peste.out", "w", stdout); ^