Compilare: user.c: In function ‘main’: user.c:7:5: warning: unused variable ‘pairs’ [-Wunused-variable] int pairs[10000]; ^ user.c:5:15: warning: variable ‘file2’ set but not used [-Wunused-but-set-variable] FILE *file1, *file2; ^ user.c:12:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &A); ^ user.c:13:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &B); ^ user.c:14:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^