Compilare: user.cpp: In function ‘void sortp(int, int, int)’: user.cpp:33:9: warning: unused variable ‘i’ [-Wunused-variable] int i, x = left, y = left + len - 1, m, M; ^ user.cpp: In function ‘void solve()’: user.cpp:79:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void read()’: user.cpp:26:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortare.in", "r", stdin); ^ user.cpp:27:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:29:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &p[i].a, &p[i].b, &p[i].c); ^ user.cpp: In function ‘void write()’: user.cpp:85:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortare.out", "w", stdout); ^