Compilare: user.c: In function ‘main’: user.c:13:22: warning: unused variable ‘ssj’ [-Wunused-variable] int si, sj, ssi, ssj; ^ user.c:13:17: warning: unused variable ‘ssi’ [-Wunused-variable] int si, sj, ssi, ssj; ^ user.c:13:13: warning: unused variable ‘sj’ [-Wunused-variable] int si, sj, ssi, ssj; ^ user.c:13:9: warning: unused variable ‘si’ [-Wunused-variable] int si, sj, ssi, ssj; ^ user.c:12:19: warning: unused variable ‘st’ [-Wunused-variable] int smax = 0, st; ^ user.c:11:18: warning: variable ‘minj’ set but not used [-Wunused-but-set-variable] int i, j, k, minj, N, best, idx, besti, min; ^ user.c:14:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("joctv.in", "r", stdin); ^ user.c:15:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("joctv.out", "w", stdout); ^ user.c:16:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.c:19:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &S[i][j]); ^