Compilare: user.cpp: In function ‘void perm()’: user.cpp:43:9: warning: unused variable ‘k’ [-Wunused-variable] int k, i, ci; ^ user.cpp: In function ‘void readFile()’: user.cpp:23:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:27:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &p[i]); ^