Compilare: user.cpp: In function ‘int main()’: user.cpp:120:29: warning: unused variable ‘aux’ [-Wunused-variable] int aux = a[1]; ^~~ user.cpp:85:25: warning: unused variable ‘found’ [-Wunused-variable] int NR = 0, found = 0, N = 0, nr, w = 1; ^~~~~ user.cpp:85:43: warning: unused variable ‘nr’ [-Wunused-variable] int NR = 0, found = 0, N = 0, nr, w = 1; ^~ user.cpp:85:47: warning: unused variable ‘w’ [-Wunused-variable] int NR = 0, found = 0, N = 0, nr, w = 1; ^ user.cpp:51:13: warning: unused variable ‘scad’ [-Wunused-variable] int scad = 0, cat = 0, P = 1; ^~~~ user.cpp:40:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscfft.in", "r", stdin); ^ user.cpp:41:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscfft.out", "w", stdout); ^ user.cpp:42:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:44:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &s); ^ user.cpp:45:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[1]); ^ user.cpp:47:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^