Compilare: user.c: In function ‘main’: user.c:21:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &N); ^ user.c:22:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &K); ^ user.c:26:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &v[i]); ^ user.c:11:5: warning: ‘res’ may be used uninitialized in this function [-Wmaybe-uninitialized] return a < b ? a : b; ^ user.c:17:25: note: ‘res’ was declared here long long i, j, nr, res; ^