Compilare: user.cpp: In function ‘void pre()’: user.cpp:90:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < coords.size(); i++) ^ user.cpp: In function ‘frac solve_right()’: user.cpp:110:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘frac solve_left()’: user.cpp:155:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘int main()’: user.cpp:203:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diapazon.in", "r", stdin); ^ user.cpp:204:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diapazon.out", "w", stdout); ^ user.cpp:206:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:208:70: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld%lld", &I[i].l, &I[i].r, &I[i].p, &I[i].q); ^