Compilare: user.cpp: In function ‘int main()’: user.cpp:37:6: warning: unused variable ‘a’ [-Wunused-variable] int a[100000], b[100000]; ^ user.cpp:37:17: warning: unused variable ‘b’ [-Wunused-variable] int a[100000], b[100000]; ^ user.cpp:38:6: warning: variable ‘counta’ set but not used [-Wunused-but-set-variable] int counta = 0, countb = 0; ^ user.cpp:38:18: warning: variable ‘countb’ set but not used [-Wunused-but-set-variable] int counta = 0, countb = 0; ^ user.cpp:43:25: warning: unused variable ‘current’ [-Wunused-variable] char *prefix, *sufix, *current; ^ user.cpp:42:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:48:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s%s%s", s, st, dr); ^